ecit'15 proceedings

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Proceedings of The 2015 N

ational Conference on E

lectronics, Com

munications and Inform

ation Technology

K YU HI THO QUC GIA 2015

V IN T, TRUYN THNGV CNG NGH THNG TIN

Proceedings of The 2015 National Conferenceon Electronics, Communications

and Information Technology

HI V TUYN IN T VIT NAM HC VIN CNG NGH BU CHNH VIN THNG

NH XUT BN KHOA HC V K THUT

EC

IT 2

015

SCH KHNG BN

215166H00ISBN: 978-604-67-0635-9

K YU HI THO QUC GIA 2015

V IN T, TRUYN THNGV CNG NGH THNG TIN


and Information Technology EC

IT 2

015

ECIT 2015

i

K YU HI THO QUC GIA 2015v IN T, TRUYN THNG

v CNG NGH THNG TIN


and Information Technology

ECIT 2015

iv

MC LC

Mc lc ......................................................................................................................................... ivLi cho mng ca Gim c Hc Vin ................................................................................... xiBan t chc hi tho.................................................................................................................. xiiBan chng trnh ...................................................................................................................... xiiiDanh sch cc phn bin ......................................................................................................... xvi

Bo co mi 1: Quy hoch tn s cho h thng thng tin di ng th h th 5 ti Vit NamMr. on Quang Hoan, Cc Trng Cc Tn S V Tuyn in, B Thng tin v Truyn thng, Vit Nam ....................................................................................xviii

Bo co mi 2: Enabling Technologies for Future Sustainable Optical InfrastructureDr. Tetsuya Miyazaki, Photonic Network Research Institute (PNRI),National Institute of Information and Communications Technology (NICT) ..................................................................xix

Bo co mi 3: iu Ch a Sng Mang Nh Cng C Chng Nhiu Nhn To (Multicarrier Modulation as Tool to Combat the Influence of Man-made Noise)Prof.Hunh Hu Tu,Technical Editor-in-Chief, REV Journal on Electronics and Communications, Vietnam ............................................................................................................ xx

Bo co mi ca tiu ban Truyn Thng v Mng: Build Tomorrows 5G Systems TodayMr. Phm ng Khoa, K s ng dng, National Instruments ..................................................xxii

Hiu qu s dng nng lng ca ng xung trong h thng thng tin MIMO vi rt nhiu ngten trm gcLng c Bng, Nguyn Th Thanh Hng, Trng Trung Kin ................................................ 1

Gii php nh x thch nghi cho h thng OFDM bng m BICM-ID vi cc b nh x tn hiu 16-QAM khc nhau Cng Hng ................................................................................................................................ 7

Quy hoch tn s cho h thng thng tin di ng th h th 5 ti Vit Namon Quang Hoan, Nguyn Anh Tun ......................................................................................... 13

Ti u ho lu tr ni dung trong mng ICNNguyn Quc Anh, V Th Lu Phng, L Tun Anh ................................................................ 18

iu Phi Tc V Trong H Thng MAP-REDUCE Da Trn Tnh a Phng Ca D LiuHunh Tn t, Bi Xun Lc ...................................................................................................... 24

ng dng ti u ha a mc tiu trong bi ton t ng phn loi th rcNguyn Xun Thng, Trn Quang Anh, Trnh Bo Ngc, Nguyn Thanh H .............................. 30

Nng cao cht lng to nh siu m sng bin dng s dng hai bc lcLng Quang Hi, Nguyn Linh Trung, Trn c Tn................................................................. 36

Thy vn trn m hnh 3DNguyn Lng Nht, o Duy Lim, Lng Xun Dn ............................................................... 41

Pht hin v c lng khong cch ti vt cn tr gip cnh bo cho ngi khim thNguyn Quc Hng, Trn Th Thanh Hi, V Hi, Hong Vn Nam, Nguyn Quang Hoan ........ 45

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Kho st gii thut iu khin tc nghn cho lung TCPNguyn Xun Khnh .................................................................................................................... 51

M Phng S Tc ng Ca Lng Ma Ln Qu Trnh Thy Triu Ti Vng ng Bng Sng Cu LongHong Ngc Hin, Hunh Xun Hip ........................................................................................... 60

Gii Thut Phng Trnh Tnh Trng Qu Ti Trong in Ton m MyNguyn Xun Phi, Trn Cng Hng ............................................................................................. 66

Gn nhn ng ngha trong song ng Anh-VitHunh Quang c, Trn L Tm Linh.......................................................................................... 71

Xy dng gii php iu khin thch nghi hi t nhanh thit k b lc tch cc 3 phaHunh L Minh Thin, H Vn Cu, Trn Thanh V, ng Trnh .......................................... 77

Mt phng php trch trn thuc tnh hiu qu cho d liu c s chiu lnH Vn Sang, ng Th Ngc Lan, Ng Th Thu Trang ............................................................... 82

Giao thc nh tuyn IPv6 c s nhn thc v nng lng cho mng cm bin khng dyV Chin Thng, Nguyn Vn To, V Vn San, L Nht Thng ............................................... 87

Mt phng thc pht hin bt thng trong lu lng mngNguyn H Dng ....................................................................................................................... 92

xut gii php nh gi cn bng bng thng mngNguyn Chin Trinh, Trn Minh Anh ............................................................................................. 96

Thit K v Ch To B Dao ng VCO Bng S Rng Mt OctaveNguyn Tn Nhn ...................................................................................................................... 102

Thit K Phng Th Nghim Vin Thng T Xa Da Trn B Th Nghim Emona DATExLng Vinh Quc Danh, Nguyn Th Trm ................................................................................ 107

Pht trin lc ch k s mNguyn Tin Giang, Nguyn c Thy, L nh Sn, Lu Hng Dng .....................................112

M hnh trng s kt hp cc phng php trch chn c tnh trong nhn dng hnh ng ngiNguyn Nng Hng Vn, Phm Minh Tun, Ung Nho Di ..........................................................119

Theo vt a i tng bng gii thut lc ht trn c s ca chui Markov Monte CarloTrng Cng Dung Nghi, Ch Vit Nht Anh, H Phc Tin, Hng Tun ......................... 125

Nng cao cht lng gom cm kt qu tm kim video s dng kt hp c trng m thanh, c trng th gic v thng tin vn bnNguyn Quang Phc, Nguyn Th Anh Th, Ng c Thnh, L nh Duy, Nguyn Hong T Anh ............................................................................................................... 130

ng dng PCA trong nhn dng c ch tay ngn ng ting VitNguyn Th Hng Tho, V Hu Tin, Nguyn Ngc Minh, V Vn San ................................ 136

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Tng quan nhng thch thc ca k thut theo di bnh tiu ng bng phng php khng xm lnCh c Hong, L Th Nh, Trn Minh T, Hong nh i, Xun Hiu .......................... 140

Cng ngh nhng trong thit k thit b o in tim c chc nng pht hin phc b QRSPhm Vn Nam, Trn Hoi Linh ................................................................................................. 146

Phng Php Tham S Cho Bi Ton c Lng Thi Gian Tr Thay i Theo Thi Gian Gia Hai Tn Hiu in CLu Gia Thin, Trn Trung Duy, Tn Hnh, L Quang Ph ....................................................... 152

H thng h tr nng dn trn thit b di ng: Nhn dng cua gingNguyn Thin An, Nguyn Thi Nghe ........................................................................................ 159

Phng Php c Lng Gi Tr H S Hp Th Ring (SAR) Ca Thit B Di ng C a ng-ten Pht S Dng Gn C Th Con NgiChu Vn Hi, L nh Thnh ..................................................................................................... 165

Nng Cao Tn Hiu Ting Ni Bng Gim Nhiu Phi Tuyn Da Vo Min WaveletTuan V. Tran, Tuan V. Pham ....................................................................................................... 169

Anten D Sng Terahertz Trong H Quang Ph Min Thi Gian Dng Xung Laser Femto Giy Nguyn Trng Khang, Nguyn Thanh T, ng L Khoa, Ha Th Hong Yn, Hunh Vn Tun ......................................................................................................................... 175

nh gi hiu qu cp nht nhiu trc tuyn trong cc thut ton nng cao cht lng ting nio Vn Ln, Hong Vn Phc, V Ha Tin ........................................................................... 178

Tng Kh Nng Pht Hin Mc Tiu C Kch Thc Nh, Phn X Yu Chuyn ng Trn B Mt Nn Bng Gii Php Phn Cc-DopplerPhm Trng Hng ...................................................................................................................... 182

H Thng M Ho V Nhn Dng Mu Hai Chiu ng Dng Trong In n V Tra Cu Thng TinHong Anh Tun, Nguyn Hu Phng, Bi Trng T .............................................................. 186

B c Lng Chuyn ng Nguyn Thng Lng Cao Trn Thut Ton Full-Search Cho Chun H.264Hunh Quc Thnh, Bi Trng T ............................................................................................... 190

Thut ton lpso lp lch thc thi lung cng vic cho cc ng dng khoa hc trong mi trng in ton m myPhan Thanh Ton, Nguyn Th Lc, Nguyn Don Cng ....................................................... 194

H Thng Nhng Nhn Dng Ting Ni Ting Vit S Dng Mel-Frequency Cepstral Coefficients V Dynamic Time WarpingL c Lc, Trn Vn Hong, Hong Trang .............................................................................. 200

Mt Phng Php Dch T Mi Trong Dch My Hoa-VitTrn Thanh Phc, Trnh Thanh Duy, Nguyn Th Thanh Tho, inh in ............................... 206

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Mu Thit K Cho Vic Pht Trin Phn Mm Trong Mi Trng m My: Bn Kho St Hin TrngNg Huy Bin, Trn an Th ..................................................................................................... 212

Nhn dng ngn ng k hiu ting Vit vi c ch ng da trn h ta cuV c Hong, Hunh Hu Hng, Nguyn Hng Sang, Jean Meunier .................................... 222

V mt phng php xy dng h mt m lai ghpNguyn TonThng, Ng cThin ........................................................................................... 227

Pht trin thut ton xc lp kho cho cc h mt m kha i xngHong Vn Vit, Nguyn c Thy, Bi Th Truyn, Lu Hng Dng ...................................... 232

Nn tn hiu ECG v bo mt thng tin bnh nhnNguyn Lng Nht, o Duy Lim, Nguyn Th Minh Thy ...................................................... 236

E-RISKE, mt s mt m kha b mt da trn cc phn t kh nghch v kh nghch m rng trong cc vnh a thc bc hu hn h s nh phn c hai lp k cyclicCao Minh Thng, Nguyn Bnh, Hong Mnh Thng, Nguyn Ngc Qun ............................... 240

Mt s phng php mi xc nh cp ca a thc trn vnh a thc s dng tnh cht ca nhm nhn cyclic i xngNguyn Trung Hiu ..................................................................................................................... 248

V mt kin trc mng n-ron nhn to trn FPGA ng dng trong nhn dng ch s vit tayNguyn Th Kim Anh, Nguyn Trng Th, Hunh Vit Thng .................................................. 253

Ci Tin Tc Hi T Ca Gii Thut Ti u By n Cho Bi Ton nh X ng Dng Ln Mng Trn Chipng Th Hng Giang, Phm Minh Trin ................................................................................. 257

Xy dng thut ton iu khin tia siu m hi t da trn FPGATrn Trng Thng, Nguyn Duy Thng, Trnh Quang c ......................................................... 262

Phng php chnh lch trong hin thc ha cc hm phc tp trn ASIC cho cc h thng DSPSi Vn Thun, Hong Vn Phc, Trn Vn Khn ..................................................................... 267

Chng Trnh iu Khin, Thu Thp V X L D Liu Cc i Lng in c o, Kim Tra Bng Thit B o Cng Sut Hioki 3334Nguyn Trng Thng, Phng Ph Bnh ...................................................................................... 273

Mng th h mi Tng lai ca Internet v truyn thngNguyn Chin Trinh, Trn Minh Anh ........................................................................................... 276

Nghin cu v thit k Gng thng minh kim thit b theo di sc khoPhan Ngc ip, Phm Vn Tun .............................................................................................. 282

Phn Loi Cu Tr Li Gi Mo Trn Cc Trang Web Hi p Cng ng Da Vo Quan H Ngi DngNng Th Hoa, Quch Xun Trng, Nguyn Thu Linh, V Th Thu Tho, Nguyn Xun Hng .................................................................................................................... 288

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nh Gi Tri Nghim Khch Hng S Dng Dch V IPTVPhan Thanh Vy, L Tun Anh ..................................................................................................... 293

Thut ton x l khng gian thch nghi cc tn hiu mng anten sL Ngc Uyn, Nguyn Trung Thnh ......................................................................................... 297

S dng quay pha ph ti u sng mang thu gim nh hng ring ca mo phi tuyn trn h thng MIMO STBC 2xNRNguyn Tt Nam, Nguyn Quc Bnh ........................................................................................ 303

K Thut Sp Xp Can Nhiu Cho H Thng Phi Hp Nhiu Cell Vi Thng Tin Trng Thi Knh Khng Hon HoNguyn Quang Tun, H Hong Kha, T Quang Hng, V Qu Sn ....................................... 309

Phn tch t s tn hiu/ tp ca h thng radar mimoL Ngc Uyn, V Vn Phc, inh Vn Trng, Cao Vn V ................................................... 314

Nng cao tc truyn tin trong mt knh nc bin nng thuc vnh Bc B ca Vit Nam dng iu ch OFDMTrn Cao Quyn ......................................................................................................................... 318

Nng cao hiu qu ca m BCH s dng phng php gii m da trn chun SyndromePhm Khc Hoan, L Vn Thi .................................................................................................. 322

Hiu nng m ha vi tp lnh AES-NINguyn Tun Anh, Lng Th Dng, Nguyn Th Trang ........................................................... 327

nh Gi Hiu Nng My Vector H Tr S Dng Hm Nhn Radial Basic trong H Thng Nhn Dng Khun Mt S Dng Khi Trch Xut PCA-LDAPhm Vn Tun, H Xun Cng, H c Trung ..................................................................... 330

nh gi b nhn ng ngha LLOCEH Xun Vinh, Nguyn Th Thanh Tho, inh in ................................................................... 336

nh gi hiu nng mt s m hnh hc my thng k vi vn nhn dng thanh iu ting Vit niNguyn Hng Quang, Trnh Vn Loan ....................................................................................... 342

D bo dch t da trn m hnh hc my phn lpL Th Ngc Anh, Hong Xun Du ........................................................................................... 348

K thut tra cu nh cy dc liu da vo ni dung phc v cho pht hin, qun l v khai thcNguyn Vn Hun, Nguyn Vn To ......................................................................................... 353

Thit k ch to thit b si m mu v dch truynNguyn Phan Kin, Th Thu Hng, Truong Duc Thuan ........................................................ 358

Mt phng php o c tnh cht in mi cho cht lng tn hao cao tn s vi baNguyn t Sn, Lm Tn Pht, L Nguyn Ngn ................................................................... 363

Nghin cu v thit k chip x l a nhn s dng Multi2SimNg Quang Vinh, c Ho, Hong Trang, V nh Thnh .................................................. 369

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Pht hin bt thng trong dng i ngi da trn khung xng s dng m hnh Markov nNguyn Trng Nguyn, Hunh Hu Hng ................................................................................. 378

K Thut Nn Ting Ni S ng Dng Trong Thng Tin V Tuyn Sng NgnNguyn Nam Hi ........................................................................................................................ 384

H Thng Gi Bi Bo Khoa HcS Kim Anh, Nguyn Thi Nghe ................................................................................................ 388

Thit k anten mng ti cu hnh tn s s dng cu trc DGSNguyn Ngc Lan, V Vn Ym, Bernard Journeet, Lm Hng Thch, Trnh Th Hng ......... 394

Nghin cu, thit k, ch to b thit b thc hnh in tm phc v o toNguyn L Cng, Hong Vn ng, inh Vn Tun ............................................................... 399

Nhng nh Hng Ca Thi Tit i Vi Kt Ni Mng Quang V TuynL Quc Cng,Tng Ch Kit ................................................................................................... 403

K Thut iu Ch QPSK Cho H Thng Thng Tin Quang V Tuyn DWDML Quc Cng, L Duy Hng ................................................................................................... 409

Phn tch nh hng ca gc truyn, ng phn x v s phn b ngun sng trong truyn thng nh sng kh kin dng LEDNguyn Thanh Sn, Trn Ph Cng ........................................................................................ 415

M hnh nh gi suy hao hai vng truyn sng trong hm m than ch nhtNguyn Vn Ti, Lm Hng Thch, Nguyn Hong Hi ............................................................ 420

Thit k h thng gim st dy chuyn sn xut cng nghip thi gian thc s dng cng ngh PLC tch hp trn nn giao thc IP Trng Tun, Phm Gia im, Phm Hong Anh, on Vn Ton, Nguyn Vit c, Phm Tin t, L Bo Sn, L Anh Tun Dng .................................................................... 425

M hnh tnh ton v Kin trc mng ti cu hnh cu trc th cho cc ng dng iu khin hiu nng caoNguyn c Nam, Trn Quang Vinh, Nguyn Kim Hng ......................................................... 431

M Hnh Nghin Cu Thc Nghim V Truyn D Liu Thi Gian Thc S Dng nh Sng n LED Trng Tun, H Duyn Trung, La Vn Thin, Phan Vn Huy, Lng Tun Hi .................... 437

Pht hin v bm ui c bng phng php GMM kt hp Frame-DifferencingNguyn nh Minh Nht, Hunh Nh Kin, V Ngc Nhn, Phm Vn Tun ........................... 443

iu khin dn ng hnh vi cho robot di ng hai bnh vi saiNguyn Th Thanh Vn, Phng Mnh Dng, ng Anh Vit, Quch Cng Hong, Trn Quang Vinh ........................................................................................................................ 450

Nghin cu tc ng ca phng php iu chnh mc sng da trn ct mc nng lng bin sau ln i tng n si t, n hunh quang v n compactNguyn Phan Kin, Nguyn Mnh Cng, Hong Anh Dng, Trn c Hng, Ch Hiu ... 456

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Kin Trc Vi Mch FFT C S Hai Vi S im Linh ng V Chnh Xc Cao Vi Cng Ngh 130nmPhm ng Lm, Nguyn Trng Ng Nht Du, Ng Thnh t, Hong Trang ......................... 461

nh gi hiu nng bo mt ca mng v tuyn nhn thc chuyn tip a chngChu Tin Dng, V Nguyn Quc Bo, Nguyn Lng Nht, H Vn Cu .............................. 466

Kho St S nh Hng Ca Phn Cng Khng Hon Ho Ln Mng Chuyn Tip a Chng Trong Cc Mi Trng Fading Khc NhauPhm Minh Quang, Trn Trung Duy, V Nguyn Quc Bo ...................................................... 471

nh Gi Hiu Nng Mng V Tuyn Nhn Thc Dng Nn Vi TAS/SC v Suy Hao Phn CngPhm Th an Ngc, Trn Trung Duy, V Nguyn Quc Bo, H Vn Khng, Nguyn Lng Nht ................................................................................................................... 477

Nng Cao Hiu Nng Bo Mt Mng Th Cp Vi K Thut Chn Nhiu Nt Chuyn Tip n Phnng Th Hng, Trn Trung Duy, Lu Gia Thin, V Nguyn Quc Bo .................................. 482

Phn Tch Hiu Nng ca H Thng Truyn Thng Chuyn Tip ng Ln vi Thu Thp Nng Lng v Kt Hp La Chn ti Nt chTrn Mnh Hong, Nguyn Th Thi Ha, Trn Trung Duy, V Nguyn Quc Bo .................... 488

iu Khin Xe Ln Da Trn Nhn Dng nh Trng Thi Ca Bn Tay Vi Board Intel GalileoTrng Phong Tuyn, Phm Hong Lm, Phm Thanh Hng ................................................ 494

Danh sch tc gi ..................................................................................................................... 502

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LI CHO MNG CA GIM C HC VIN

Knh tha qu v i biu, cc nh khoa hc v cc tc gi

Tip ni s thnh cng ca Hi ngh Quc t v cc cng ngh tin tin trong truyn thng (ATC 2014) din ra ti H Ni nm 2014, Hc vin Cng ngh Bu chnh Vin thng (Hc vin) tht vinh d tip tc cng Hi V tuyn in t Vit Nam t chc Hi tho Quc gia nm 2015 v in t, Truyn thng v Cng ngh Thng tin (The 2015 National Conference on Electronics, Communications, and Information Technology - ECIT 2015) ti Thnh ph H Ch Minh trong hai ngy 10-11/12/2015.

Vi b dy 60 nm hnh thnh v pht trin, trong nhng nm qua, Hc vin Cng ngh Bu chnh Vin thng, nay trc thuc B Thng tin v Truyn thng c nhng ng gp v cng hin to ln cho qu trnh pht trin kinh t, x hi ca t nc thng qua vic cung cp ngun nhn lc v cc sn phm nghin cu c cht lng cao trong lnh vc Cng ngh Thng tin v Truyn thng. Hc vin hin l ci ni o to v nghin cu ca hn 20.000 sinh vin, hc vin v gn 1.000 cn b nghin cu v ging vin ang trc tip ging dy, nghin cu khoa hc ti 09 ngnh o to, 03 Vin nghin cu v 02 c s o to di hn v ngn hn ti hai thnh ph ln nht c nc l H Ni v Thnh ph H Ch Minh.

Trong nhng nm qua, Hi tho ECIT khng nh l hot ng trao i hc thut uy tn cp quc gia do Hi V tuyn in t t chc, theo m hnh kt hp gia Hi khoa hc vi cc trng i hc nhm to lp mt din n trao i chuyn su c cht lng v cc lnh vc thuc chuyn ngnh in t, cng ngh thng tin v truyn thng. L trng i hc hng u trong lnh vc Cng ngh Thng tin v Truyn thng, trc thuc B chuyn ngnh ch qun, Hc vin Cng ngh Bu chnh Vin thng vinh d cng phi hp vi Hi V tuyn in t Vit Nam tham gia Hi tho ECIT 2015. Hi tho ln ny thu ht c 62 bi bo dng thuyt trnh v 30 bi bo dng poster trn tng s 135 bi bo ng k. Cc ch c trnh by u l cc lnh vc c quan tm hin nay nh khoa hc my tnh, k thut truyn thng, mng truyn d liu, x l tn hiu v hnh nh v in t y sinh, iu ny ha hn mang n mt Hi tho c cht lng chuyn mn cao ca Ngnh. Hi tho cng l ni cc nh khoa hc, cc i biu c dp chia s, trao i nhng kinh nghim qu bu, nhng kt qu trong hot ng nghin cu khoa hc cng ngh trong cc lnh vc nu trn, qua ng gp hiu qu cho s nghip cng nghip ha, hin i ha v hi nhp quc t ca t nc.

Trong sut qu trnh chun b Hi tho, Hc vin nhn c s ng h, phi hp v ch o v t vn thng xuyn ca Ban ch o Hi tho, s tn tm v trch nhim ca Ban chng trnh Hi ngh, s chu o, nhit tnh ca cc tiu ban hu cn, khnh tit v c bit l s ng gp tch cc ca cc tc gi bi bo c c thnh cng ca Hi tho ECIT 2015. Qua Hi tho ln ny, Hc vin mong mun tip tc cng Hi V tuyn in t Vit Nam ng cai cc Hi ngh, Hi tho trong nc v quc t khc trong thi gian ti, nhm ng gp hn na vo s pht trin ca nn khoa hc, cng ngh ca nc nh.

Thay mt Hc vin Cng ngh Bu chnh Vin thng, xin knh chc qu v i biu, cc v khch mi, cc tc gi v ngi tham d gt hi c nhiu kt qu hu ch t Hi tho v c nhng ngy giao lu, chia s trong mt khng kh m m ti thnh ph mang tn Bc.

Gim c Hc vin Cng ngh Bu chnh Vin thng

TS. V Vn San

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BAN T CHC HI THO

BAN CH OPGS. TS. Nguyn Ngc Bnh, Ch tch Hi V tuyn in t Vit NamTS. V Vn San, Gim c Hc vin Cng ngh Bu chnh Vin thngGS. Hunh Hu Tu, i Hc Quc Gia TP. H Ch Minh

BAN T CHCTS. Tn Hnh, Hc vin Cng ngh Bu chnh Vin thngPGS.TS. Trn Xun Nam, Hc vin KTQS & Hi VTT Vit NamPGS.TS. Nguyn Hu Thanh, Trng i hc Bch Khoa H NiPGS.TS. Trng V Bng Giang, Trng i hc Cng ngh, HQGHNPGS.TS. Nguyn L Hng, Trng i hc Bch Khoa NngPGS. TS. inh c Anh V, i Hc Cng Ngh Thng Tin TP. H Ch MinhTS. Mai Linh, Trng i Hc Quc T TP. H Ch MinhTS. Bi Trng T, i Hc Khoa Hc T Nhin Thnh Ph H Ch MinhPGS. TS. V Nguyn Quc Bo, Hc vin Cng ngh Bu chnh Vin thng

BAN T CHC A PHNGTS. ng Hoi Bc, Hc vin Cng ngh Bu chnh Vin thngTS. Trn Trung Duy, Hc vin Cng ngh Bu chnh Vin thng

BAN XUT BNPGS. TSKH. Hong ng Hi, Hc vin Cng ngh Bu chnh Vin thng

PGS. TS. ng Th Ngc, Hc vin Cng ngh Bu chnh Vin thng

BAN TH KThS. Phm Th an Ngc, Hc vin Cng ngh Bu chnh Vin thngThS. Phm Minh Quang, Hc vin Cng ngh Bu chnh Vin thngTriu Phng Tho, Hc vin Cng ngh Bu chnh Vin thng

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BAN CHNG TRNH

BAN CHNG TRNHPGS. TS. Trn Quang Anh, Hc vin Cng ngh Bu chnh Vin thngPGS. TS. Trng V Bng Giang, Trng i hc Cng ngh, HQGHNTS. Hng Tun, Trng i Hc Bch Khoa TP. H Ch MinhPGS. TS. V Nguyn Quc Bo, Hc vin Cng ngh Bu chnh Vin thng

TIU BAN K THUT TRUYN THNG

PGS. TS. H Vn Khng, i Hc Bch Khoa TP. H Ch MinhTS. Trng Trung Kin, Hc vin Cng ngh Bu chnh Vin thngTS. L B Tn, B Thng Tin TruynThng

TIU BAN SIU CAO TN V TRUYN SNG

TS. Nguyn Bnh Dng, i Hc Quc T TP. H Ch MinhPGS. TS. V Vn Ym, Trng i hc Bch khoa H NiPGS.TS. Trn Minh Tun, Vin Nghin cu Chin lc Cng ngh thng tin - Truyn thng

TIU BAN K THUT IN T

PGS. TS. inh c Anh V, i Hc Cng Ngh Thng Tin TP. H Ch Minh TS. Hunh Ph Minh Cng, Trng i hc Bch khoa Tp. H Ch Minh TS. L c Hng, i Hc Khoa Hc T Nhin TP. H Ch Minh TS. H c Bnh, i Hc Duy Tn, Nng

TIU BAN K THUT MNG MY TNH V IU KHIN

PGS. TS. Nguyn Hu Thanh, i Hc Bch Khoa H NiTS. V Nguyn Sn, i Hc Duy Tn, TP. H Ch MinhPGS. TS. Ch c Trnh, Trng i hc Cng ngh, HQGHN

TIU BAN X L TN HIU

PGS. TS. Trn c Tn, i Hc Cng Ngh, i Hc Quc Gia H NiPGS. TS. Trn t, Trung Tm MICA, i Hc Bch Khoa H NiTS. V Trung Dng, i Hc Bch Khoa TP. H Ch Minh

TIU BAN GIO DC V O TO

PGS.TS. Phm Ngc Nam, i hc Bch Khoa H Ni PGS. TS. Trn Cng Hng, Hc Vin Cng Ngh Bu Chnh Vin Thng

TIU BAN CNG NGH THNG TIN

PGS. TS. T Minh Phng, Hc Vin Cng Ngh Bu Chnh Vin Thng PGS. TS. Bi Thu Lm, Hc Vin K Thut Qun S

CC THNH VIN KHC

L Tun Anh, i Hc Th Du MtCh Vit Nht Anh, i Hc Bch Khoa TP. H Ch MinhNg Xun Bch, Hc Vin Cng Ngh Bu Chnh Vin ThngV Nguyn Quc Bo, Hc Vin Cng Ngh Bu Chnh Vin Thng

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V nh By, i Hc Tn c ThngPh Ha Bnh, Vin Vt Liu - Vin Hn Lm Khoa Hc v Cng Ngh Vit NamPhm Vn Cng, Hc Vin Cng Ngh Bu Chnh Vin ThngNguyn Vn Cng, i Hc Bch Khoa NngLng Vinh Quc Danh, i Hc Cn ThTrn t, i Hc Bch Khoa H NiHong Xun Du, Hc Vin Cng Ngh Bu Chnh Vin ThngNguyn Quc nh, Hc Vin K Thut Qun SNguyn Quc nh, i hc Bch khoa H NiNguyn Tun c, i Hc Quc T - i Hc Quc Gia TP. H Ch Minhng Ngc Minh c, i Hc Tn c ThngNg V c, i hc Bch khoa H NiNguyn Bnh Dng, i Hc Quc T - i Hc Quc Gia TP. H Ch MinhTrn Trung Duy, Hc Vin Cng Ngh Bu Chnh Vin ThngPhm Thanh Giang, Vin Cng Ngh Thng TinNguyn Xun H, i Hc Tn ToTrn Th Thanh Hi, i Hc Bch Khoa H NiPhm Thanh Hip, i Hc K Thut L Qu ninh Ch Hiu, B Thng Tin v Truyn ThngNguyn Xun Hoi, i Hc H NiNguyn Huy Hong, i Hc K Thut L Qu nNguyn Kim Hng, i Hc Quc Gia H NiL c Hng, i Hc Khoa Hc T Nhin - i Hc Quc Gia TP. H Ch MinhNguyn Vit Hng, Hc Vin Cng Ngh Bu Chnh Vin ThngNguyn L Hng, i Hc Bch Khoa NngH Hong Kha, i Hc Bch Khoa TP. H Ch MinhH Vn Khng, i Hc Bch Khoa TP. H Ch MinhTrng Trung Kin, Hc Vin Cng Ngh Bu Chnh Vin ThngL Th Lan, i Hc Bch Khoa H NiV Th Kiu Loan, i Hc Tn ToBi Xun Lc, i Hc Tn ToNg Thnh Long, i Hc K Thut L Qu nNguyn Ngc Trng Minh, i Hc Quc T - i Hc Quc Gia TP. H Ch MinhPhm Tun Minh, i Hc S Phm H NiNguyn Ngc Minh, Hc Vin Cng Ngh Bu Chnh Vin ThngTrn Xun Nam, i Hc K Thut L Qu nPhm Th an Ngc, Hc Vin Cng Ngh Bu Chnh Vin Thngng Th Ngc, Hc Vin Cng Ngh Bu Chnh Vin Thng Th Bch Ngc, Hc Vin Cng Ngh Bu Chnh Vin ThngHong Vn Phc, i Hc K Thut L Qu n

xv

V Th Lu Phng, i Hc Quc T, i Hc Quc Gia TP. H Ch MinhT Minh Phng, Hc Vin Cng Ngh Bu Chnh Vin ThngPhm Minh Quang, Hc Vin Cng Ngh Bu Chnh Vin ThngTrn Minh Quang, i Hc Bch Khoa TP. H Ch MinhNguyn Xun Quyn, i Hc Bch Khoa H NiTrn Th Sn, Cao ng Cng Ngh Thng Tin Hu Ngh Vit - HnTrn c Tn, i Hc Quc Gia H NiHong Mnh Thng, i Hc Bch Khoa H NiCao Minh Thng, Hc Vin Cng Ngh Bu Chnh Vin ThngTrn Thin Thanh, i Hc Giao Thng Vn Ti TP. H Ch MinhQun Thnh Th, i Hc Bch Khoa TP. H Ch MinhV Hu Tin, Hc Vin Cng Ngh Bu Chnh Vin ThngNguyn Nam Trn, i Hc Sasketchewan, CanadaNguyn Chin Trinh, Hc Vin Cng Ngh Bu Chnh Vin ThngH Duyn Trung, i Hc Bch Khoa H NiTrn Xun T, i Hc Cng Ngh, i Hc Quc Gia H NiPhm Vn Tun, i Hc Bch Khoa NngHunh Hu Tu, i Hc Quc T, i Hc Quc Gia TP. H Ch MinhTrn Quang Vinh, i Hc Bch Khoa H NiTrng Quang Vinh, i Hc Bch Khoa TP. H Ch MinhL S Vinh, i Hc Cng Ngh, i Hc Quc Gia H Niinh c Anh V, i Hc Cng Ngh Thng Tin - i Hc Quc Gia TP. H Ch MinhV Vn Ym, i Hc Bch Khoa H Ni

xvi

DANH SCH CC PHN BIN

Ch Vit Nht Anh, i Hc Bch Khoa TP. H Ch MinhL Tun Anh, i Hc Th Du MtNg Xun Bch, Hc Vin Cng Ngh Bu Chnh Vin ThngTrng Quc Bo, i Hc Cn ThV nh By, i Hc Tn c ThngPhm Vn Cng, Hc Vin Cng Ngh Bu Chnh Vin ThngNguyn Tun ng, i Hc Lc HngLng Vinh Quc Danh, i Hc Cn ThHong Xun Du, Hc Vin Cng Ngh Bu Chnh Vin ThngNguyn Quc nh, Hc Vin K Thut Qun Sng Ngc Minh c, i Hc Tn c ThngNg V c, i Hc Bch Khoa H NiNguyn Tun c, i Hc Quc T - HQG TP. H Ch MinhNguyn Bnh Dng, i Hc Quc T - HQG TP. H Ch MinhTrn Trung Duy, Hc Vin Cng Ngh Bu Chnh Vin ThngPhan nh Duy, i Hc Cng Ngh Thng TinNguyn Xun H, i Hc Tn ToHong Mnh H, i Hc Bch Khoa TP. H Ch MinhPhm Thanh Hip, i Hc K Thut L Qu ninh Ch Hiu, B Thng Tin v Truyn Thngng Th Hng, Trng S Quan Thng Tin Nha TrangNguyn Vit Hng, Hc Vin Cng Ngh Bu Chnh Vin ThngNguyn L Hng, i Hc Bch Khoa NngNguyn Kim Hng, i Hc Quc Gia H NiL c Hng, i Hc Khoa Hc T Nhin - HQG TP. H Ch MinhTrng Thu Hng, i Hc Bch Khoa H NiH Hong Kha, i Hc Bch Khoa TP. H Ch MinhH Vn Khng, i Hc Bch Khoa TP. H Ch MinhTrngTrung Kin, Hc Vin Cng Ngh Bu Chnh Vin ThngL Th Lan, i Hc Bch Khoa H NiBi Xun Lc, i Hc Tn ToNg Thnh Long, i Hc K Thut L Qu nPhm Tun Minh, i Hc S Phm H NiNguyn NgcTrng Minh, i Hc Quc T - HQG TP. H Ch MinhTrn Xun Nam, i Hc K Thut L Qu nNguyn Th Kim Ngn, i Hc S Phm H Ning Th Ngc, Hc Vin Cng Ngh Bu Chnh Vin Thng Th Bch Ngc, Hc Vin Cng Ngh Bu Chnh Vin ThngNguyn Hu Pht, i Hc Bch Khoa H Ni

xvii

Hong Vn Phc, i Hc K Thut L Qu nV Th Lu Phng, i Hc Quc T, HQG TP. H Ch MinhT Minh Phng, Hc Vin Cng Ngh Bu Chnh Vin ThngTrn Minh Quang, i Hc Bch Khoa TP. H Ch MinhNguyn Xun Quyn, i Hc Bch Khoa H NiTrn Th Sn, Cao ng Cng Ngh Thng Tin Hu Ngh Vit - HnPhm Ngc Sn, i Hc S Phm K ThutTrn c Tn, i Hc Quc Gia H NiHong Mnh Thng, i Hc K Thut H NiNg c Thin, Hc Vin Cng Ngh Bu Chnh Vin ThngQun Thnh Th, i Hc Bch Khoa TP. H Ch Minh nh Thun, i Hc S Phm K ThutV HuTin, Hc Vin Cng Ngh Bu Chnh Vin ThngNguyn Chin Trinh, Hc Vin Cng Ngh Bu Chnh Vin ThngH Duyn Trung, i Hc Bch Khoa H NiTrn Quang Vinh, i Hc K Thut H Niinh c Anh V, i Hc Cng Ngh Thng Tin - HQG TP. H Ch Minh

xviii

BO CO MI S 1

Quy Hoch Tn S Cho H Thng Thng Tin Di ngTh H Th 5 Ti Vit Nam

Mr. on Quang Hoan

Cc Trng Cc Tn S V Tuyn in,B Thng tin v Truyn thng, Vit Nam

Tm tt:

Th gii ang hng ti mng thng tin kt ni rng khp v kt ni mi loi hnh thit b. Thit b thng tin di ng ngy cng a dng v ang l thnh phn thit yu ca cuc sng. Mng thng tin di ng th h th 5 cn phi p ng nhu cu v tc cao v dung lng d liu ln, kt ni nhiu thit b cng lc, tr thp v tin cy cao khi m mng thng tin th h th 4 cha p ng c. Bi bo ny s nh gi li hin trng quy hoch v s dng bng tn cho thng tin di ng ca Vit Nam. ng thi nh gi s tng trng ca th trng thng tin di ng giai on 2011-2014, d bo nhu cu giai on 2015-2020 nh gi nhu cu ph tn i vi thng tin di ng bng rng ca Vit Nam. Da trn cc phn tch ny, bi bo phn tch nhng kh khn v thun li trong vic qun l ti nguyn tn s. Tc gi cng s a ra gii php quy hoch li cc bng tn hin c cho thng tin di ng bng rng v gii php tm kim quy hoch bng tn mi cho thng tin di ng bng rng ca Vit Nam.

Tiu s:

ng on Quang Hoan l mt trong nhng chuyn gia hng u trong lnh vc qun l tn s v tuyn in. ng tt nghip K s Thng tin v tuyn i hc Bch Khoa H Ni vo nm 1980. T nm 1995 n 2006, ng cng tc tri qua nhiu chc v ti Cc Tn S V Tuyn in. T nm 2006 n nay, ng m nhim chc Cc Trng Cc Tn S V Tuyn in, B Thng tin v Truyn thng, Vit Nam. ng lnh o nhm iu phi d n v tinh thnh cng Vit Nam. ng l Ph Trng Phi on Vit Nam trong Hi ngh Thng tin V tuyn Th Gii (WRC), Hip hi Thng tin V tuyn vo nhng nm 2003, 2007 v 2012. ng cng l Ch tch Phn nhm Qun l Tn s ASEAN v ng Ch tch

Din n Chnh sch Tn s ASEAN. ng cn l thnh vin ca Hi ng Quy chun V tuyn ITU vo nm 2014.

xix

BO CO MI S 2

Enabling Technologies for Future Sustainable Optical Infrastructure

Dr. Tetsuya Miyazaki

Photonic Network Research Institute (PNRI)National Institute of Information and Communications Technology (NICT)

Tm tt:

I would like to introduce most recent research activities of PNRI of NICT, convergence of optical & wireless communication and spatial division multiplexing (SDM) transmission technologies and network architecture for future sustainable network infrastructure.

Tiu s:

Tetsuya Miyazaki received the M.S. and Dr. Eng. degrees in information processing from the Tokyo Institute of Technology, Tokyo, Japan, in 1987 and 1997, respectively.

From 1987 to 2002, he was with KDDI R&D Laboratories, where he was engaged in research on coherent optical communications and WDM optical networks.

Since 2002 April, he has been with NICT where he was engaged in research on ultra-fast and multi-level modulation techniques. He has been a Director General of Photonic Network Research Institute of NICT since April 2011.

xx

BO CO MI S 3

iu Ch a Sng Mang Nh Cng C Chng Nhiu Nhn To(Multicarrier Modulation as Tool to Combat the Influence of

Man-made Noise)

Prof. Hunh Hu TuTechnical Editor-in-Chief, REV Journal on Electronics and Communications, Vietnam

Tm tt:

My thp nin qua, mng vin thng khng dy c pht trin nh v bo; s ngun pht sng ngy hm nay tht s dy c, to ra mt ngun nhiu nhn to quan trng c tnh cht xung. Ngun nhiu ny c mt s nh nghin cu quan tm; h ra mt s m hnh thng k v cng c thc nghim kim chng. ng thi, mng truyn d liu c nghin cu v trin khai trn nn mng ti in (Power Lines Communications). Mt trong nhng yu t nh hng ln n cht lng ca h thng PLC l loi nhiu cng c tnh cht xung. Loi nhiu ny xut hin do cc s kin xy ra trn h thng ti in nh cng tc bt m, nhiu nn do bin ng ca mc in mt chiu, v.v Loi nhiu ny cng c kh nhiu nh nghin cu quan tm. Loi nhiu c tnh cht xung cng xut hin trong cc h thng thng tin quang v cc h thng ADSL. Tt c loi nhiu ny u c tnh cht xung, tc l nhiu xut hin di dng t hp cc tn hiu c dng chuyn tip ngu nhin, ging nh nhiu loi sc (Shot Noise) trong cc thit b in t c nghin cu t nhng nm 30-40 ca th k trc.

Bi thuyt trnh ny s trnh by cc quan im cng nh cc m hnh nhiu khng chun, pht xut t loi nhiu xung nh va c trnh by. Da vo o lng thc nghim, chng ti khuyn co nn dng m hnh nhiu loi A l m hnh c tnh tng thch cao so vi thc tin. T y, mt s phng php nh gi cht lng cc h thng truyn dn di nh hng ca loi nhiu khng chun ny cng s c cp, c bit l phng php m phng Mont-Carlo. Chng li nh hng ca loi nhiu ny, ngi ta thng s dng mt s phng php x l phi tuyn nh mc ha (thresholding), mng n ron, v.v Nhng phng php ny c th c cht lng cao, nhng v phc tp ca n, nn kh c th c s sng trong thc t. Mt phng php khc c khi xng u nhng nm 60 l tri v nn tri tn hiu (spread-despread). Hin nay, vi m hnh nhiu loi A, lc s dng h iu sng a sng mang, ta thy xut hin thao tc tri nhiu mt cch t nhin, lm nh hng ca nhiu bt trm trng. kt lun bi thuyt trnh ny, chng ti s trnh by mt s kt qu va thu lm c bng m phng Mont-Carlo v ct ngha l do ti sao COFDM l h thng va c kh nng chng pha inh a ng va chng nhiu khng chun mt cch c hiu qu.

xxi

GS. TS. Hunh Hu Tu sinh trng ti Thnh ph Hu; bo v thnh cng lun n Sc.D. nm 1972 ti i hc Laval, ti y, t nm 1966 n 1972, ng l Nghin cu vin v Gio s tr ging ca khoa K s in v My tnh; sau ng tr thnh Ph Gio s vo nm 1975 v Gio s thc th nm 1983. Nm 2004, ng ri i hc Laval tr v tip tc cng vic ging dy, hng dn v nghin cu ti i hc Cng Ngh thuc i hc Quc gia H Ni. ng ri i hc Cng ngh nm 2007 tham gia xy dng i hc Quc t

Bc H m ng l ngi Hiu trng u tin. ng l khch mi ca AT&T Information Systems in Neptune, N.J. nm 1984 v tng c mi ging dy ti mt s i hc Bc M, u Chu v Chu. T nm 2012 n nay, ng l Gio s ti i hc Quc t thuc i hc Quc gia Thnh ph H Ch Minh. Gio s Hunh Hu Tu l tc gi v ng tc gi ca 2 quyn sch chuyn kho do Nh xut bn Economica v Wiley pht hnh v hn 200 cng trnh nghin cu c cng b di dng Research reports ca cc cng ty hay trn cc tp ch chuyn ngnh. ng hng dn thnh cng 17 lun n tin s v 45 lun n thc s trong v ngoi nc; ng cng tng l c vn cho mt s cng ty v mt s t chc nh nc Canada v Hoa K. Mi quan tm hin nay ca Gio s Hunh Hu Tu bao gm cc k thut m hnh ha, m phng Monte Carlo nhanh, cc thut ton v cu trc x l nhanh vi p dng vo cc vn thc tin, ch yu l h thng truyn dn s.

xxii

BO CO MI CA TIU BAN TRUYN THNG V MNG

Build Tomorrows 5G Systems TodayMr. Phm ng Khoa

K s ng dng, National Instruments

Tm tt:

Trong bi thuyt trnh ny, chng ti s trao i v tm nhn 5G v cc hng nghin cu chnh v 5G trn th gii hin nay. Chng ti s gii thiu cc cng ngh phn cng v phn mm ca National Instruments h tr cc nh nghin cu trong vic ch th (prototype) v hin thc ha cc tng nghin cu. V chng ti cng s cp nht nhng kt qu nghin cu t ph trong cng ngh 5G ca cc trng i hc v cc tp on vin thng trn th gii.

Tiu s:

Phm ng Khoa tt nghip t trng i hc Quc gia Singapore (NUS) vi bng C nhn K thut in & in t. Trc khi gia nhp National Instruments, anh tng lm vic cho mt cng ty pht trin giao din ngi v my da trn cng ngh mi v cm ng m thanh. Anh cng tng cng tc ti Vin nghin cu vin thng Singapore vi vai tr k s nghin cu.

Gia nhp National Instruments t thng 9 nm 2011, ng Khoa hin chu trch nhim h tr t vn k thut v tin hnh o to k thut v sn phm v cng ngh ca National Instruments cho khch hng

ti Vit Nam. Anh cng chu trch nhim h tr k thut cho cng vic qung b cc cng ngh ca National Instruments n ngi dng.

1

Hi Tho Quc Gia 2015 v in T, Truyn Thng v Cng Ngh Thng Tin (ECIT 2015)

ISBN: 978-604-67-0635-9

Hiu qu s dng nng lng cang xung trong h thng thng tin MIMO

vi rt nhiu ngten trm gcLng c Bng, Nguyn Th Thanh Hng v Trng Trung Kin

Trung tm Nghin cu K thut Thng tin V tuyn, Vin Khoa hc K thut Bu in B mn Marketing, Vin Kinh t Bu in

Khoa K thut in t I Phng th nghim H thng V tuyn v ng dng

Hc vin Cng ngh Bu chnh Vin thng, 122 Hong Quc Vit, H Ni, Vit NamEmail: [email protected], [email protected], [email protected]

Tm ttH thng thng tin nhiu u vo nhiu ura (MIMO - Multiple-Input Multiple-Output) vi rt nhiungten trm gc l mt cng ngh ng c cho mngthng tin di ng th h 5 (5G). tng ca h thngny l s dng hp l cc ngten trm gc truynd liu c lp ng thi ti nhiu thu bao. Cc bi botrc y khi nghin cu h thng ny thng tp trungvo hoc kh nng ci thin tng dung lng truyn tinvi mt cng sut tiu th c nh hoc kh nng gimcng sut tiu th nhng vn m bo tng dung lngtruyn tin cho trc. Mt s t bi bo nghin cu hiuqu s dng nng lng ca h thng ny nhng ch yucho m hnh n cell, do b qua mt s tnh cht quantrng ca h thng nh nhiu tn hiu hoa tiu. Trongbi bo ny, chng ti xut mt phng php mi phn tch hiu qu s dng nng lng ng xung camng thng tin MIMO vi rt nhiu ngten trm gcv vi nhiu cell hot ng trn cng bng tn. Da trnkt qu m phng s tng ng, chng ti cng thu cnhng nhn xt th v v nh hng ca mt s tham sh thng ln hiu qu s dng nng lng ca h thng.

T khaHiu qu s dng nng lng, h thngMIMO vi rt nhiu ng-ten trm gc, mng thng tindi ng th h 5 (5G), h thng thng tin "xanh".

I. GII THIU

Mc d tch hp cng ngh thng tin nhiu u vonhiu u ra (MIMO - Multiple-Input Multiple-Output),cc h thng di ng t bo hin nay vn cha t cmc tc cao m cng ngh ny ha hn do mixem xt cc cu hnh MIMO nh [1]. V d trong hthng 4G LTE/LTE-Advanced, mi trm gc c ti a 8ngten trong khi thit b ngi dng c ti a 4 ngten.H thng thng tin MIMO vi rt nhiu ngten trmgc l mt k thut thng tin t ph mi ha hn pht

huy ht kh nng ca cng ngh MIMO thng qua victrin khai hng trm ngten tng trm gc v s dngtruyn dn MIMO a ngi dng (MU-MIMO) phcv ng thi hng chc ngi dng [2]. Cc bi botrc y khi nghin cu cc h thng thng tin MIMOvi rt nhiu ngten trm gc thng tp trung vohoc kh nng ci thin tng dung lng truyn tin vimt cng sut tiu th c nh [2][4] hoc kh nnggim cng sut tiu th nhng vn m bo tng dunglng truyn tin cho trc [5]. Trong thc t, mt cchtip cn dung ho hai mc tiu thit k c phn muthun nhau ny l ti a ho t s hiu qu s dngnng lng ca h thng. Theo nh ngha, hiu qu sdng nng lng ca mt h thng thng tin l t sgia tng dung lng thng tin c truyn i trn tngcng sut tiu th tng ng.

Trong kh nng hiu bit ca chng ti, n nay ckh t bi bo nghin cu hiu qu s dng nnglng ca h thng thng tin MIMO vi rt nhiu ngten trm gc [6][9]. Bi bo [6] so snh hiu qu s dnghiu qu nng lng gia h thng MIMO vi nhiungten trm gc v h thng s dng cell c nh. Tuynhin, bi bo ny mi ch tnh n cng sut tiu thlin quan n bc x tn hiu. Bi bo [7] xut mtm hnh cng sut tiu th mi khng ch bao gm cngsut pht trn b khch i cng sut m cn l cngsut tiu th mch bi cc thnh phn ca trm BSs(Base Stations) v bi cc thit b tng t. T m hnhmi a ra c cng thc tnh hiu qu nng lng,sau xc nh c s ng-ten cn thit mang lihiu qu nng lng cho h thng MIMO c rt ln.Tuy nhin, m hnh cng sut tiu th s dng trong

1


2


bi bo [7] kh n gin v cha phn nh c ccc trng ring ca truyn dn MIMO a ngi dng.Cc bi bo [8], [9] xut mt m hnh cng sut tiuth thc t hn v c kh nng phn nh c ch x ltn hiu v truyn dn MIMO a ngi dng nghincu hiu qu s dng nng lng ca h thng MIMOn cell vi nhiu ngten trm gc. Vic xem xt chmt cell duy nht b qua mt s tnh cht quan trngca h thng ny nh nhiu tn hiu hoa tiu v nhiulin cell khi truyn d liu.

Trong bi bo ny, chng ti xem xt h thng thngtin MIMO vi rt nhiu ngten trm gc v vi nhiucell hot ng trn cng mt bng tn. Chng ti githit h thng ny hot ng ch song cng phnchia theo thi gian (TDD - Time Division Duplexing)trong trm gc c lng cc h s knh truyn datrn tn hiu hoa tiu ng ln. Chng ti gi thittrm gc s dng m trc truyn t s cc i (MRT -Maximal Ratio Transmission) truyn d liu ngxung. ng gp chnh ca chng ti trong bi bo nyl xut mt phng php mi phn tch hiu qus dng nng lng ca h thng trn bng cch sdng cc tip cn tm gi tr tt nh tng ng vmt m hnh cng sut tiu th c sa i t m hnh xut trong cc bi bo [8], [9]. Kt qu phn tch chora mt gi tr xp x ca hiu qu s dng nng lngca h thng di dng mt hm s ca mt s thams h thng nh h s pha inh phm vi ln, s ngten trm gc, s thu bao trong mi cell, cng sut tiuth ca mi phn t trong mng. Kt qu m phng scho php chng ti c mt s nhn xt quan trng vnh hng ca cc tham s h thng ln hiu qu sdng nng lng ca h thng. V d, khi c nh sthu bao trong mt cell, tn ti mt gi tr s ngtentrn trm gc ti u. ng ch l gi tr ti u nynm trong gii hn cho php ca cc cng ngh ch tongten hin nay. Bn cnh , khi c nh s ngtentrn trm gc, tng s thu bao trong mt cell c thgp phn lm tng hiu qu s dng nng lng.

II. M HNH H THNG

Xt mt mng t bo vi C cell, hay t bo. Micell c mt trm gc vi Nt ngten phc v ng thicho U ngi dng c phn b mt cch ngu nhiutrong cng cell. Cc cell v trm gc c nh s bitp C = {1, 2, , C}. Ngi dng trong cell c Cc nh s bi tp Uc = {1, 2, , U}. Thit b ucui ngi dng s dng ch c mt ngten. Trong hthng MIMO c s dng rt nhiu ngten trm gc,s lng ngten ti mi trm gc thng phi ln hnrt nhiu so vi s ngi dng c phc v, tc l

Nt U . H thng mng hot ng ch TDDtrong tt c cc cell dng chung mt bng tn c rng B Hz. C ngha l tn hiu ng ln v ngxung c truyn trn ton b bng tn ti nhng thiim khc nhau. Chng ti gi thit rng tt c cc trmgc v thit b ngi dng c ng b c v thi gianv v tn s. Bn cnh , chng ti gi thit rng cckhong bo v min tn s c b qua.

K hiu BC (Hz) l rng bng thng kt hp vTC (giy) l thi gian kt hp ca knh truyn gia trmgc v thit b ngi dng. Chng ti gi thit m hnhknh pha inh khi cn tnh trong cc h s knhtruyn c coi nh khng thay i trong mi khi tinguyn thi gian-tn s c kch thc t = BCTC ln sdng knh. Chng ti cng gi thit mt khung truyndn ng vi mt khi ti nguyn thi gian-tn s. Khiu hbcu CNt1 l vector h s knh truyn ngln t thu bao u Uc ti trm gc b C. Chng ti githit m hnh knh truyn khng tng quan v khnggian. C th, hbcu c biu din bi [2], [3]

hbcu =1/2bcugbcu (1)

trong gbcu CNt1 l vector h s knh truynpha inh nhanh v bcu l gi tr tt nh biu dinh s knh truyn pha inh phm vi ln bao gmcc hiu ng nh suy hao ng truyn, che khut vsuy hao xuyn tng. Chng ti gi thit rng cc hs ca gbcu l c lp thng k v cng tun theophn b chun, tc l gbcu CN (0, INt). Chng ticng gi thit knh ng ln v knh ng xungc tnh cht o nhau (reciprocity) hon ho. tincho vic vit cc biu thc ton hc, chng ti githit hbcu C1Nt l vector h s knh truyn ngxung t trm gc b C ti thu bao u Uc. K hiuHbc = [hbc1hbc2 hbcU ] CNtU l ma trn knhtng hp t tt c cc thu bao trong cell c C ti trmgc b C.

Trong h thng ny, chng ti gi thit rng thit bngi dng ch c thng tin trng thi knh thng k caknh truyn gia thit b v trm gc trong cng cell.Cc trm gc phi c lng cc h s knh truyn tcthi t trm gc ti cc thu bao trong cng cell datrn tn hiu hoa tiu ng ln. Khng mt tnh tngqut, chng ti gi thit tn hiu hoa tiu c truyn i ng ln trong p ln s dng knh u mi khungtruyn dn [2], [10][12]. Trong bi bo ny, chng tigi thit ch tp trung vo truyn d liu ng xung.Sau khi c lng knh v thit k b m trc, mitrm gc s truyn ng thi d liu n cc thu baotrong cng cell trong d = (t p) ln s dng knh

2


3


cn li. Chng ti gi thit cc khung truyn dn cng b trn ton mng.Gi thit rng tt c cc cell dng chung mt tp tn

hiu hoa tiu tng h trc giao tng cp k hiu. Tnhtrc giao ny yu cu p U . Gi thit rng cc trmgc s dng phng php c lng knh sai s trungphng nh nht (MMSE - Minimum Mean SquaredError). Khi , trm gc b thu c mt c lng cahbbu nh sau [2], [3]

hbbu =bbubu

(hbbu +

c=b

hbcu + zp,b

)(2)

trong bu = 2

ppp+C

c=1 bcu. Vi mi c C, chngti nh ngha

bcu =bbubcu

bu. (3)

Ch rng hbbu CN (0, bbuINt). Sai s c lngknh c cho bi hbbu = hbbu hbbu trong hbbu CN (0, (bbu bbu)INt).

K hiu xbu l k hiu d liu m trm gc b Ccn truyn cho thu bao u Ub trong mt ln s dngknh. Chng ti gi thit rng cc k hiu d liu cntruyn ng xung c lp thng k vi nhau vcng tun theo phn b Gauss vi E[xr,bu|] = 0 vE[|xr,bu|2] = 1. Trm gc b C s dng mt ma trnm trc bu CNt1 nh x xbu ti cc ngtenpht. K hiu b l h s chun ho ng vi gii hncng sut pht trung bnh. Cng thc tnh b nh sau

b =1U

u=1 E[fbufbu]. (4)

K hiu zbu l tp m Gauss trng cng vi trung bnhkhng v phng sai 2 ti thu bao u Ub. K hiupf l cng sut pht trung bnh ti trm gc truynd liu ti mi thu bao. Chng ti gi thit rng pf lbng nhau cho tt c thu bao. Thu bao u Ub nhnc tn hiu sau y ng xung

ybu =pf

Cc=1

Uu=1

ch

cbufckxf,ck + zf,bu. (5)

III. NH GI HIU QU S DNG NNGLNG

A. nh gi tc d liu ng xung t c

Trong bi bo ny, thun li cho vic tnh ton,chng ti gi thit rng cc trm gc s dng ma trnm trc MRT. Ma trn m trc ny c thit k datrn c lng knh tng ng, tc l fbu = hbbu vimi b C v u Ub. Chng ti cng s dng phng

php tnh gi tr tng ng tt nh (deterministicequivalence) (c s dng rng ri nh trong [3], [4] tm gi tr xp x ca t s cng sut tn hiu trn cngsut nhiu v tp m (SINR - Signal-to-Interference-plus-Noise Ratio) ng xung ng vi thu bao u Ub.C th l, bng cch thay th Rbcu = bcuINt vo trongnh l 5 trong [3] v sau mt s bin i , chng tithu c gi tr SINR tng ng tt nh ng vi thubao u Ub nh sau

bu(p, Nt) =Abu(p)Nt

Bbu(p)Nt + Cbu(p)(6)

trong

b(p) =

( Uk=1

bbk

)1(7)

Abu(p) =b(p)2bbu (8)

Bbu(p) =c=b

c(p)2bcu (9)

Cbu(p) =2

pf+

(c,k)=(b,u)

c(p)bckbbu. (10)

Khi phn mo u c lng knh c tnh n,gi tr tt nh tng ng ca tc d liu ngxung t c ng vi thu bao u Ub trn c bngtn hot ng l

Rbu(p, Nt) =Bdt

log2[1 + bu(p, Nt)](bit/s) (11)

trong BBC th hin s khi ti nguyn thi gian-khnggian c lp trn c bng tn hot ng v dt th hint l thi gian thc s c dng truyn d liu trongmt khong thi gian kt hp. Ch rng tc tc ti mi thu bao ph thuc vo c p v Nt.

B. nh gi cng sut tiu th

Chng ti c th chia cng sut tiu th trong mngthnh hai nhm: cng sut bc x v cng sut tiu thca mch in t. Chng ti gi thit rng cc phn tthit b tng ng cc trm gc c gi tr tham shot ng ging nhau. Tng t, chng ti gi thit rngcc phn t thit b tng ng cc thit b ngis dng cng c gi tr tham s hot ng ging nhau.Ging nh khi nh gi tc d liu t c, trongphn ny chng ti s tnh cc cng sut tiu th thnhphn ng vi c bng tn hot ng B Hz.

1) Cng sut bc x: K hiu BS l hiu sut cab khuch i cng sut ti trm gc v UE l hiu sutb khuch i cng sut thit b ngi dng, trong 0 < BS, UE 1. K hiu PRPp l cng sut bc x

3


4


(tnh theo Watt) ca cc thit b ngi s dng trongmt cell trong giai on truyn tn hiu hoa tiu. Khiu PRPf l cng sut bc x (tnh bng W) ca mttrm gc trong giai on truyn d liu ng xung.Cng sut bc x tng cng ca trm gc v cc thitb ngi dng trong mt cell c tnh nh sau

PRP(p) =1

TC (Uppp

UE PRPp

+pfdBS

PRPf

) (W). (12)

Ch rng PRP(p) c lp thng k vi Nt.2) Cng sut tiu th ca mch in t: Trong bi

bo ny, chng ti xut p dng mt phin bn sai ca m hnh cng sut tiu th ca mch in trongh thng truyn dn MIMO a ngi dng c xuttrong [9]. Cng sut tiu th cho cc phn t mch int v cho cc hot ng tnh ton c trnh by chi tittrong phn ny.u tin, k hiu PTC l cng sut tiu th ca chui

thu pht (transceiver chains). K hiu PBS l cng suttiu th ca tt c cc phn t mch in t dnh ringcho mt ngten trm gc v PUE l cng sut tiuth ca tt c cc phn t mch in t dnh ring chomt ngten thit b ngi dng. Ch rng c PBSv PUE khng ph thuc vo Nt, U v tc d liu.Theo cc kt qu trong [13] chng ti c th tnh cngsut tiu th cc chui thu pht l

PTC(Nt) =NtPBS + UPUE (W). (13)

Cng sut tiu th ny c lp vi p.Th hai, k hiu PCE l cng sut tiu th ca qu

trnh c lng knh (channel estimation). K hiu LBSv LUE l hiu sut tnh ton dng s cc php tongi tr phc trn Joule (hay s flop/Watt) ti trm gcv ti thit b ngi dng. Khi c lng knh truyn,trm gc b thc hin php nhn ma trn Yp,b CNtpvi u Cp1. y l mt php tnh i s tuyntnh thng thng v c thc hin mt ln trong mikhung truyn dn. Nh vy, chng ti c

PCE(p, Nt) =B

t

2UNtpLBS

(W). (14)

Th ba, k hiu PC/D,b l cng sut tiu th ca cckhi m ho v gii m knh trong cell b trong mtkhung truyn dn. K hiu PCD l tng cng sut tiuth (tn theo Watt/bit) m ho v gii m mt bitthng tin. Chng ti tnh c

PC/D,b(p, Nt) =PCD

Uu=1

Rbu(p, Nt) (W). (15)

Th t, k hiu PBT l cng sut tiu th (tnh theoWatt/bit) truyn 1 bit d liu ng xung qua ngtrc. Khi , cng sut tiu th ph thuc ti tin cang trc trong cell b c tnh nh sau

PBH,b(p, Nt) =PBT

Uu=1

Rbu(p, Nt) (W). (16)

Th nm, k hiu PLP l cng sut tiu th ca qutrnh x l tn hiu tuyn tnh. C hai hot ng tnhton chnh trong qu trnh x l tn hiu tuyn tnh titrm gc b: i) xc nh ma trn m trc v ii) nhnvector k hiu cn truyn vi ma trn m trc. Ch rng hot ng u tin ch c thc hin mt lntrong mi khung trong khi hot ng th hai cthc hin cho mi ln s dng knh trong qu trnhtruyn d liu. V vy, da trn m hnh cng sut tiuth c xut trong [9], chng ti tnh PLP nh sau

PLP(p, Nt) =B

t

[3NtU

LBS+ d

2NtU

LBS

](W). (17)

Cui cng, k hiu PFIX(W) l cng sut tiu thc nh trong mt khung truyn dn dnh cho vic lmmt nh trm, bo hiu iu khin v b x l bng tngc. Ch rng PFIX khng ph thuc vo p, Nt vlng d liu cn truyn.

Tm li, tng cng sut tiu th ca mch in ttrong trm gc v cc thit b ngi dng trong cell bc k hiu l PCP,b(p, Nt) v c tnh nh sau

PCP,b(p, Nt) =PFIX + PTC(Nt) + PCE(p, Nt)

+ PC/D,b(p, Nt) + PBH,b(p, Nt)

+ PLP(p, Nt) (W). (18)

3) Cng sut tiu th tng cng: Tng cng sut tiuth thc t ca mch in l Pb(p, Nt) = PRP(p) +PCP,b(p, Nt). Thay th Rbu(p, Nt) bi gi tr tt nhtng ng Rbu(p, Nt) trong (15) and (16) v thay thcc kt qu nhn c vo (18), chng ti nhn cPb(p, Nt) l gi tr tt nh tng ng ca cng suttiu th tng cng ng vi cell b. Ch rng cng suttiu th tng cng ph thuc vo c p v Nt.

C. Tnh ton hiu qu s dng nng lng

Hiu qu s dng nng lng ca h thng c nhngha l t s gia lng d liu tng cng c truyni thnh cng trn tng cng sut tiu th tng ng.K hiu EEb l hiu qu s dng nng lng ca cellb. Theo nh ngha, chng ti c

EEb(p, Nt) =

Uu=1 Rbu(p, Nt)

Pb(p, Nt)(bit/J). (19)

4


5


V vy, gi tr tt nh tng ng ca hiu qu sdng nng lng ca cell b c tnh nh sau

EEb(p, Nt) =

Uu=1 Rbu(p, Nt))

Pb(p, Nt)(bit/J). (20)

IV. KT QU M PHNG V TNH TON S

Trong phn ny, chng ti m phng mt mng thngtin di ng c 7 cell, mi cell c hnh lc gic u cb tr nh trong Hnh 1. Trong , cc trm gc ct trung tm ca cell v c miu t bng hnh trn.Thu bao c v tr phn b u ngu nhin trong dintch ca mi cell v c miu t bng hnh ch nht.Do n thi im bi bo c gi ng, 3GPP vncha thng nht b tham s cho h thng thng tin ding 5G pht trin trn nn LTE/LTE-Advanced. V vy,chng ti c th s dng mt phn b tham s ca hthng thng tin di ng 4G LTE/LTE-Advanced khi xydng kch bn m phng. V d, m hnh suy hao ngtruyn l 128, 1 + 37, 6 log10(d) vi d > 0, 035km lkhong cch truyn dn tnh theo km. Bng IV trnh bymt s tham s h thng chnh dng trong m phng.Chng ti s kho st hiu qu s dng nng lng cacell trung tm trong Hnh 1.

Thu bao

Trm gc (BS)

Hnh 1. M hnh mng c m phng gm 7 cell.

Hnh 2 trnh by kt qu m phng hiu qu s dngnng lng ca h thng MIMO s dng rt nhiungten trm gc di dng hm s ca Nt cho ccgi tr khc nhau ca U {6, 12, 18, 24}. T cc ktqu m phng trn, chng ta c th c mt s nhn xtnh sau. Trc ht, vi U c nh, hiu qu s dngnng lng ca h thng l mt hm li ca s ng-tenti trm gc. iu ny c th gii thch da vo tc tng ca tc bit tng cng v ca tng cng suttiu th khi tng Nt. Ch rng, tng cng sut tiuth l mt hm tuyn tnh bc nht ca Nt. Trong khi, tc bit tng cng l mt hm logarithm ca Nt.V vy, trong min gi tr Nt nh, khi tng Nt, hiunng s dng nng lng ca h thng tng gn nhtuyn tnh. Nu tip tc tng Nt, n mt thi im

Bng IMT S THAM S M PHNG

Tn tham s Gi trCng sut pht ca UE 24dBmCng sut pht ca BS 43dBmTn s sng mang 2GHzMt tp m nhit -174dBm/HzBng thng kt hp BC 180kHzThi gian kt hp TC 10msTng ch ngten BS 10dBiTng ch ngten UE 0dBiH s tp m nhit BS 5dBH s tp m nhit UE 9dBHiu sut tnh ton ti BS 12,8 Gflops/WHiu sut tnh ton ti UE 5 Gflops/WH s khuch i cng sut ti BS 0,39H s khuch i cng sut ti UE 0,3Cng sut tiu th c nh 18WCng sut tiu th ng vi mt ng-ten ti BS

1W

Cng sut tiu th ng vi mt ng-ten UE

0,1W

Cng sut tiu th m ha v giim

0,9 W/(Gbit/s)

Cng sut tiu th truyn d liuqua ng trc

0,25W/(Gbit/s)

nht nh, tc tng ca tc bit tng cng s chmhn tc tng ca tng cng sut tiu th, khin chohiu qu s dng nng lng ca h thng bt u gim.Tip theo, vi U {6, 12, 18, 24}, s ng-ten ti trmgc ti u v hiu qu s dng nng lng tng ngl Nt = {44, 60, 68, 76}. Hin nay, mt s cng ty trin khai th nghim mt s h thng thng tin di ngMIMO c ti 128 ngten nhm mc ch nghin cu vth nghim. C th nhn thy, ti u hiu qu sdng nng lng trong h thng MIMO s dng rtnhiu ng-ten trm gc, s lng ng-ten ti u nntrin khai ti mi trm gc hon ton nm trong giihn cho php ca cc cng ngh hin c.

Hnh 3 trnh by kt qu m phng hiu qu s dngnng lng ca h thng MIMO s dng rt nhiungten trm gc l hm s ca U vi Nt cho trc.Chng ta c th nhn thy rng vi Nt cho trc, victng U (sao cho iu kin U Nt/2) lun c thomn) s lm tng hiu qu s dng nng lng trungbnh ca h thng. Tuy nhin, lng tng hiu qu sdng nng lng trung bnh ca h thng trn mi thubao mi s gim i.

5


6


24 56 88 120 152 184 216 2481

1.2

1.4

1.6

1.8

2

2.2

2.4

S ngten mi trm gc

Hi

u qu

s

dn

g tru

ng b

nh

[Mbi

t/J]

06 thu bao/cell 12 thu bao/cell 18 thu bao/cell 24 thu bao/cell

Hnh 2. nh hng ca s lng ng-ten ti trm gc ln hiu qu sdng nng lng trung bnh vi s thu bao trong mt cell cho trc.

6 9 12 15 18 211.2

1.4

1.6

1.8

2

2.2

2.4

S thu bao trong mt cell

Hi

u qu

s

dn

g n

ng l

ng

trung

bn

h [M

bit/J

]

Nt = 144 ngten/BS

Nt = 128 ngten/BS Nt = 84 ngten/BS

Hnh 3. nh hng ca s thu bao trong mt cell ln hiu qu sdng nng lng trung bnh vi s ng-ten ti trm gc cho trc.

V. KT LUN

Trong bi bo ny, chng ti xut mt phngphp phn tch hiu qu s dng nng lng ca ngxung trong h thng thng tin MIMO vi rt nhiungten trm gc vi nhiu cell hot ng trn cngbng tn. Phng php ny da trn cch tip cn tmgi tr tt nh tng ng v mt m hnh kh thct v cng sut tiu th trong mng. Kt qu m phngcho thy vi s thu bao trong mt cell cho trc, tnti mt gi tr s ngten trn trm gc ti u. Gi tr tiu ny nm trong gii hn cho php ca cc cng nghch to ngten hin nay. Kt qu m phng cng cho

thy vi s ngten trn trm gc cho trc, tng s thubao trong mt cell c th gp phn lm tng hiu qus dng nng lng. Mt hng nghin cu tip theol xc nh tm cch xc nh s ngten ti u ti trmgc vi s thu bao trong mt cell cho trc. Mt hngnghin cu khc l kho st hiu qu nng lng cacc h thng MIMO vi rt nhiu ngten trm gc sdng cc loi x k tn hiu tuyn tnh phc tp hn.

LI CM N

Nghin cu ny c ti tr bi Qu pht trin khoahc v cng ngh quc gia (NAFOSTED) trong tim s 102.02-2013.09.

TI LIU THAM KHO[1] F. Rusek, D. Persson, B. K. Lau, E. G. Larsson, T. L. Marzetta,

O. Edfors, and F. Tufvesson, Scaling up MIMO: Opportunitiesand challenges with very large arrays, IEEE Signal ProcessingMag., vol. 30, no. 1, pp. 4060, Jan. 2013.

[2] T. L. Marzetta, Noncooperative cellular wireless with unlim-ited numbers of base station antennas, IEEE Trans. WirelessCommun., vol. 9, no. 11, pp. 35903600, Nov. 2010.

[3] J. Hoydis, S. ten Brink, and M. Debbah, Massive MIMO inthe UL/DL of cellular networks: How many antennas do weneed? IEEE J. Sel. Areas Commun., vol. 31, no. 2, pp. 160171, February 2013.

[4] K. T. Truong and R. W. Heath, Jr., Effects of channel aging inmassive MIMO systems, J. Commun. Networks, vol. 14, no. 4,pp. 338351, Aug. 2013.

[5] H. Q. Ngo, E. G. Larsson, and T. L. Marzetta, Energy andspectral efficiency of very large multiuser MIMO systems, IEEETrans. Commun., vol. 61, no. 4, pp. 14361449, Apr. 2013.

[6] W. Liu, S. Han, C. Yang, and C. Sun, Massive MIMO or smallcell network: Who is more energy efficient? in Proc. of IEEEWireless Commun. Networking Conf., Apr. 2013, pp. 2429.

[7] D. Ha, K. Lee, and J. Kang, Energy efficiency analysis withcircuit power consumption in massive MIMO systems, in Proc.of IEEE Int. Symp. Personal Indoor Mobile Radio Commun.,Sep. 2013, pp. 938942.

[8] E. Bjornson, J. Hoydis, M. Kountouris, and M. Debbah, Mas-sive MIMO systems with non-ideal hardware: Energy efficiency,estimation, and capacity limits, IEEE Tran. Info. Theory, vol. 60,no. 11, pp. 71127139, Nov. 2014.

[9] E. Bjornson, L. Sanguinetti, J. Hoydis, and M. Debbah, Optimaldesign of energy-efficient multi-user MIMO systems: Is massiveMIMO the answer? IEEE Trans. Wireless Commun., vol. 14,no. 6, pp. 30593075, Jun. 2015.

[10] B. Hassibi and B. M. Hochwald, How much training is neededin multiple-antenna wireless links? IEEE Trans. Info. Theory,vol. 49, no. 4, pp. 951963, Apr. 2003.

[11] G. Caire, N. Jindal, M. Kobayashi, and N. Ravindran, MultiuserMIMO achievable rates with downlink training and channel statefeedback, IEEE Trans. Info. Theory, vol. 56, no. 6, pp. 28452866, Jun. 2010.

[12] K. T. Truong, A. Lozano, and R. Heath, Jr., Optimal trainingin continuous flat-fading massive MIMO systems, in Proc. ofIEEE European Wireless Conf., Barcelona, Spain, May 2014, pp.16.

[13] S. Cui, A. Goldsmith, and A. Babai, Energy efficiency ofMIMO and cooperative MIMO techniques in sensor networks,IEEE J. Sel. Areas Commun., vol. 22, no. 6, pp. 10891098,2004.

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Gii php nh x thch nghi cho h thng OFDM bng m BICM-ID vi cc b nh x tn hiu

16-QAM khc nhau

Cng Hng Khoa CNKT in t-Vin thng

i hc Thnh Email: [email protected], [email protected]

Abstract Yu cu nng cao cht lng li bt v tc truyndn ca mt h thng thng tin bt k lun mu thun vi nhau. Trong iu kin knh fading chn lc theo tn s, k thutOFDM v cc gii php thch nghi theo bc iu ch hay rate matching cho m Turbo c ng dng cho h thng 4G LTE khng m bo c yu cu c nh v tc truyn dn cho hthng.

So vi cc phng thc m knh truyn thng, vic s dng m BICM- ID khng ch chng t kh nng v tng ch m ha [12] m cn c kh nng thch nghi m bo tc truyn dnkhng i nh vic s dng cc b nh x khc nhau.

Tip theo cc kt qu chng minh cho gii php thch nghi dung BICM-ID vi cc b nh x 8-PSK khc nhau c trnh by trong bi bo [13] ti REV10-2006. Bi bo ny trnh by cc tnh ton v kt qu m phng chng minh cho gii php thch nghi h thng OFDM dng m BICM-ID vi cc b nh x 16-QAM khc nhau trong iu kin knh pha inh a ng c stc ng ng thi ca tp m Gauss.

Keywords- Orthogonal Frequency Division Multiplexing (OFDM), Adaptive OFDM (AOFDM), Bit Interleaved Coded Modulation with Iterative Decoding (BICM-ID).

I. GII THIU Nh bit, l mt trng hp c bit ca phng thc

pht a sng mang, trong nhng nm gn y OFDM (Orthogonal Frequency Division Multiplexing) khng ngng c nghin cu v m rng phm vi ng dng nh nhng u im ca n trong tit kim bng tn v kh nng chng li pha inh chn lc theo tn s cng nh xuyn nhiu bng hp. Cng vi s ra i ca cc chp FFT (Fast Fourier Transformers) c dung lng ln, OFDM c ng dng rng ri trong h thng truyn hnh k thut s DVB-T, cc mng khng dy theo chun IEEE 802.11a, b, g, n, cc hthng Wimax theo chun 802.16 ...v h thng thng tin 4G theo c hng LTE v Wimax.

Nhm khai thc ti a dung lng ca h thng OFDM trn cc knh pha inh bng hp, cho n nay cc nghin cuv ng dng v OFDM thch nghi (AOFDM) c tin hnh theo cc hng: iu ch a mc trn cc bng con [2]; thay i thch nghi cc tham s OFDM [11]; thch nghi cc m RSSC, m turbo cho OFDM [2].

Tuy nhin, cc phng php thch nghi truyn thng lm thng lng d liu ca h thng thay i nn l mt hn chvi cc h thng yu cu tc d liu khng i nh truynAudio-Video hai chiu trong thi gian thc. Mt khc, do qu trnh thch nghi a mc b gii hn bi ngng SNR m ti cc b gii m vn lm vic tt, do vic nghin cu cc bm tt cho h thng OFDM lun l mt cng vic cn thit. Sau m Turbo, gn y m BICM-ID (Bit Interleaved Coded Modulation with Iterative Decoding) c sut s dng kthp vi OFDM nhm t c cht lng li bt tt nht[4].

Qua phn tch l thuyt v cc kt qu m phng, chng ti thy rng h thng BICM-ID OFDM khi s dng cc php nh x symbol Gray, SP, MSEW (Maximum Squared Euclidean Weight)... s cho cc c tnh li bt khc nhau ticc vng SNR (Signal to Noise Rate) khc nhau. Da trn ctnh ny, bi bo xut mt gii php thch nghi mi cho hthng OFDM l thay i thch nghi cc b nh x theo cc ngng SNR khc nhau, cho php ti a ha c tnh li bt trn ton di SNR. Gii php ny mang li hiu qu v ng kv t l li bt m vn m bo c thng lng thng tin khng i, ph hp cho cc ng dng 2 chiu trong thi gian thc. Sau khi tnh ton v tin hnh cc th nghim m phng thnh cng cho h thng BICM-ID- OFDM vi b iu ch 4QAM v 8-PSK, chng ti tip tc tin hnh xy dng m hnh m phng chng minh cho h thng BICM-ID- OFDM vi cc b iu ch 16-QAM.

Cc ni dung tip theo ca bi bo c sp xp nh sau: Phn II trnh by c s l thuyt v OFDM v BICM-ID. PhnIII trnh by m hnh m phng h thng OFDM-BICM-ID vicc b nh x khc nhau. Phn IV l cc kt qu m phng chng minh cho gii php thch nghi c xut. Phn V l cc kt lun c rt ra.

II. C S L THUYT

2.1. L thuyt c bn v OFDM v AOFDM V bn cht, OFDM l mt trng hp c bit ca phng thc pht a sng mang theo nguyn l chia dng d liu tc cao thnh cc dng d liu tc thp hn v pht ngthi trn mt s cc sng mang c phn b trc giao vinhau. Ph ca tn hiu OFDM c m t hnh 1.

7


ISBN: 978-604-67-0635-9

8


Hnh 1: Ph ca sng mang v tn hiu OFDM

Hnh 1 cho thy do tnh trc giao, cc sng mang con khng bxuyn nhiu bi cc sng mang con khc. Vi k thut a sng mang da trn IFFT v FFT, h thng OFDM t chiu qu khng phi bng cc b lc gii thng m bng x l bng gc.Trong h thng OFDM, nh thc hin bin i chui d liu tni tip sang song song nn thi gian symbol tng ln. Do s phn tn theo thi gian gy bi tri tr do truyn dn a ng gim. Mt khc, do chu k phng v CP c chn vo gia cc symbol OFDM nn xuyn nhiu gia cc symbol (ISI) hu nh b loi tr hon ton (hnh 2). Trong khong thi gian phng v, symbol OFDM c ko di theo chu k trnh xuyn nhiu gia cc sng mang (ICI) [11].

Hnh 2. Khong phng v gia cc Symbol OFDM

Vi h thng sng mang n, mt pha inh hoc xuyn nhiu n s c tc ng ti ton b d liu truyn trn knh. Trong h thng OFDM, do vic truyn dn c thc hin trn nhiu sng mang trc giao nhau nn ch mt phn d liu bnh hng. Phn d liu b sai s c sa bng cc m sali thch hp. V vy kh nng chng pha inh ca h thngOFDM ph thuc rt nhiu vo kh nng chng nhiu ca cc b m sa li. chnh l l do m cc b m s dng cho hthng OFDM lin tc c nghin cu ci tin.

Nhm khai thc ti a dung lng Shanon bin i theo thi gian ca cc knh pha inh bng hp, tng lm thch nghi tc d liu trn mi sng mang OFDM tu thuc SNR ca sng mang c Steele v Webb sut vo nm 1991. Sau l cc nghin cu ca Sampei-Osaka, Gold Smith- Stanfor; Peace v Tozer-York; Lau v Mc.Leod - Cambridgecng nh ca L.Hanzzo v cc ng nghip [2]. Trong cc knh pha inh chn lc theo tn s, li bt thng tp trung timt vi sng mang con b pha inh, trong khi cc sng mang khc li khng b pha inh. Do cn nhn din cc sng mang con c xc sut li bt cao trong symbol OFDM v loitr ra khi vic mang d liu. Tuy vy, fading trong min tns c th lm xu SNR ca mt s sng mang ny nhng lilm tng SNR ca cc sng mang con khc nn s thit hi vthng lng d liu do vic loi tr cc sng mang b pha inh

c th c b li bng cch s dng cc b iu ch a mcbc cao hn ti cc sng mang c gi tr SNR cao. Tuy nhin, cc phng php thch nghi truyn thng cho OFDM lm thng lng d liu ca h thng thay i nn kh ng dngcho cc h thng yu cu tc d liu khng i nh truynAudio-Vieo hai chiu trong thi gian thc.Sau m Turbo, m BICM-ID c sut t nhng nm 1990 bi nhm nghin cu Li v Ritcey l b m tt cho truyn dntrn c knh Gauss v knh pha inh nh tha hng u imca cc m xon c s, tng ch xo trn bt v cc thut ton gii m lp [4]. lm r hn b m BICM-ID cng nh giiphp thch nghi xut cho h thng OFDM, chng ta s phn tch nguyn l b m BICM-ID trong mc tip theo. 2.2. C s l thuyt v BICM-IDi vi knh tp m Gauss trng cng tnh (AWGN), k thutiu ch m li TCM [1] chng t l mt phng php c hiu qu nh x cc bt c m ho vo tp tn hiu sao cho c li Euclid ti thiu gia cc t m l ln. Tuy nhin, i vi knh pha inh th ti t l tn trn tp (SNR) cao, chtlng ca m ph thuc vo c li Hamming ti thiu gia cc bt m hn l ph thuc vo c li Euclid gia cc chui tn hiu. ci thin hot ng ca m TCM trn knh fading, [2, 3] xut mt s khc gi l iu ch m c xo trn bt BICM (Bit Interleaved Coded Modulation). Trong s ny, cc bt u ra ca my m nh phn s b xo trn v tr trckhi c nh x vo tp tn hiu. Ngoi vic t c li Hammingln hn, s BICM cn cho kh nng thch ng tc truyndn mt cch mm do. Do s dng xo trn v tr mc bt ch khng phi l mctn hiu, cc s BICM hot ng km trn knh Gauss [6]. L do l v qui lut nh x ln tp tn hiu ca BICM khng thti u ho theo tiu chun cc i c li Euclid ti thiu giacc chui tn hiu. Tuy nhin, cu trc lin kt m ho vi iuch thng qua b xo trn v tr cho php thc hin gii m lpmt cch rt c hiu qu. Trn thc t, b Bin i Tn hiu-Bt BSC (Symbol-to-Bit Converter) thc hin gii iu ch mm, cng vi b gii m vng ngoi u vo mm-u ra mmSISO (Soft Input-Soft Output) cung cp thng tin v tin cyca cc bt, cho php coi cp iu ch/Gii iu ch M mcnh l log2M knh nh phn. S BICM kt hp vi gii m lp (Iterative Decoding) c k hiu l BICM-ID [6]. Vic sdng gii m lp khng nhng ci thin cht lng ca hthng trn knh fading, m cn cho cht lng tt trn knh Gauss [4, 6]. Hn th na, im mu cht y l c th tc cc hiu qu BER khc nhau nh s thay i php nh x Gray c s dng trong b to m BICM ca Zehavi [4,6].

. Hnh 3: S b m ha v gii m BICM-ID

8


9


Vi phng php gii m lp cn ti u ti my thu theo hnh 2, b gii m Viterbi c thay bng b gii m u vo v ura mm (SISO) [9]. u ra ca n c phn hi ti b giiiu ch tnh li gi tr bt. Ti b gii iu ch, gi tr t lhp l theo hm log (LLR) c xc nh theo thut ton cci xc sut hu nghim (MAP):

1

0

1

0

2t

102

t

10

( / ) ( )( 1/ )( ) log log( 0 / ) ( / ) ( )

-||r ||exp ( ) = log (2

-||r ||exp ( )

it

it

it

it

t t tis Si t t

t it t t t t

s S

mit tt

js S

mit tt

js S

P r s P sP v rLLR vP v r P r s P s

s P vN

s P vN

)

Trong ( )iteL v l gi tr thng tin ngoi (Extinsic

Information) c tnh bi b gii iu ch l:

1

0

2t

1,02

t

1,0

( 1/ ) ( 1)( ) log log( 0 / ) ( 0)

-||r ||exp ( ) = log (3)

-||r ||exp ( )

it

it

i ii t t tte i i

t tt

mit tt

j j is S

mit tt

j j is S

P v r P vL vP v r P v

s P vN

s P vN

Trong ( )itP v l xc sut c tnh theo thng tin phn

hi t b SISO sau khi xo trn v c tnh theo cng thc: a

a

a

exp(L ( )) ; 11 exp(L ( ))( ) (4)

1 ; 01 exp(L ( ))

iitti

i tt

iti

t

v vvP v

vv

Thng tin ny c a ti b gii m mm sau khi giixo trn bt. Nh b xo trn bt, cc bt m ho ban u xa nhau c th c lin kt v mt cng mt symbol knh. Vi xo trn l tng, s phn hi t cc vng d liu mnh (tb nh hng ca nhiu knh) c th loi b tnh trng tranh chp trong iu ch bc cao v ci thin qu trnh gii m ticc vng d liu yu. Vi thng tin y ca cc bt khc trong mt symbol, iu ch M-PSK hay M-QAM c a viu ch nh phn cho mi v tr bt. Tuy nhin, nu vic phnhi cha li th chng ta s nhn c mt constellation nhphn sai. Do , phn hi mm, xo trn c thit k tt v kim sot li l im mu cht n nhn c cc tng ch caBICM-ID.D c phc tp hn phn hi quyt nh cng, phnhi mm l im mu cht c c tng ch ca BICM-ID trong khi gim vic truyn li.2.3. Thit k cc b nh x tn hiu 16-QAM Cht lng tng th ca h thng BICM-ID ph thuc vo chtlng gii iu ch khi cha c thng tin tin nghim (khi hthng lm vic vng SNR thp) v mc ci thin khi c lng thng tin phn hi trong cc ln lp sau (khi h thnglm vic vng SNR cao). tin cy ca lng tin phn hi

li ph thuc rt nhiu vo khong cch Euclid ca cc bt trc v t l SNR ca tn hiu. Tm li, cht lng ca BICM-ID ph thuc rt nhiu vo cutrc cc php nh x tn hiu trong h thng. Nhn xt ny ng cho tt c cc b iu ch khc nhau. Trong bi bo ny, chng ta xt c th cho b iu ch 16-QAM. Cu trc v s biu din c li bt ca cc b nh x 16-QAM truyn thng c m t ti hnh 4. Trc ht, theo truyn thng b nh x Gray (hnh 4.a) ccoi l ti u do cc im ln cn trn constellation ch khc nhau 1 bt. Nu gii iu ch nhm gia hai im ln cn chdn n sai 1 bt tn hiu Nhn nh ny vn ng trong gii m lp ti SNR thp hoc khi s vng lp thp (khi h thng lm vic ch thng tin tin nghim thp). Ti SNR cao, h thng lm vic da vo thng tin tin nghim(4) tnh ton (3), vi thng tin y t 2 bt kia trong symbol, b gii iu ch 16-QAM a v gii iu ch nhphn. Do khong cch Euclid gia 2 im quyt nh ti tin cy khi quyt nh bt cn li l 0 hay 1. Trong constellation 16-QAM chun ho, php nh x Gray cc bt 1, 2, 3,4 c cc c ly Euclid khng u v c ly bnh phng ti thiu l 4 nn gi tr thng tin ngoi v tin cybn thn thp.D c thng tin t 2 bt kia vic xc nh bt cn li vn d bnhm ln. Do , vi thut ton gii m lp, r rng php gn nhn Gray khng phi l s la chn hon ho. Chng ta cntm cc php nh x khc c cc c ly bt cao hn nhm c c cht lng BER tt hn vng SNR cao (khi c gi trthng tin ngoi ln). Chng ti tm ra mt phng php n gin nhng hu hiutrong thit k cc b nh x symbol M-PSK v M-QAM cho bm BICM-ID.

CU LY BIT 1

00000001

00100011

01000101

01100111

10001001

10101011

11001101

11101111 CU LY BIT 2

00000001

00100011

01000101

01100111

10001001

10101011

11001101

11101111

CU LY BIT 3

00000001

00100011

01000101

01100111

10001001

10101011

11001101

11101111 CU LY BIT 4

00000001

00100011

01000101

01100111

10001001

10101011

11001101

11101111

(a) Gray mapping [11 10 7 6 12 9 8 5 15 14 3 2 16 13 4 1]

9


10


CU LY BIT 10000 0001 0010 0011

0100 0101 0110 0111

1000 1001 1010 1011

1100 1101 1110 1111

CU LY BIT 20000 0001 0010 0011

0100 0101 0110 0111

1000 1001 1010 1011

1100 1101 1110 1111

CU LY BIT 30000 0001 0010 0011

0100 0101 0110 0111

1000 1001 1010 1011

1100 1101 1110 1111

CU LY BIT 40000 0001 0010 0011

0100 0101 0110 0111

1000 1001 1010 1011

1100 1101 1110 1111

(b) SP mapping [1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16] Hnh 4. Cc s nh x 16-QAM truyn thng

T cng thc (3) cho thy rng gi tr LLR ca mi bt trong nhn nh phn ca tn hiu ph thuc vo tn hiu thu c v ph thuc vo thng tin v cc bt khc, ngoi bt ang xt, c phn hi v t b gii m. Gi thit rng thng tin phn

hi l tin cy, knh truyn vi iu ch 2mM mc c th c coi l m knh truyn song song. Mi symbol 16-QAM tng ng vi 4 bt v mi php nh x ca 16-QAM

c biu din bng mt vc t 1621 .......,, pppp

vi161, ipi i din cho im 1 tn hiu c dn nhn

nh phn 4321 ,,, vp c gi tr trong h cc l

i.Cc b nh x mi c thit k da trn nh x t khi bt ticonstenlation sao cho bt c bo v bt thp c kt hpvi bt c bo v bt cao hn. Nh vy bo v bt trung bnh ca c khi bit s ln hn. Vy nh cc bin i tuyntnh n gin, chng ta c th tm c cc b nh x symbol mi, c cc c ly bt ln hn nh cc b nh x Gray modifiedv MSEW (Hnh 5).

CU LY BIT 1

00000001

00100011

01000101

0110 0111

1000

1001 1010

1011 11001101

11101111CU LY BIT 2

00000001

00100011

01000101

0110 0111

1000

1001 1010

1011 11001101

11101111

CU LY BIT 3

00000001

00100011

01000101

0110 0111

1000

1001 1010

1011 11001101

11101111CU LY BIT 4

00000001

00100011

01000101

0110 0111

1000

1001 1010

1011 11001101

11101111

Gray modified mapping [11 10 7 6 12 9 5 8 15 2 3 14 16 13 4 1]

CU LY BIT 1

0000

0001

0010

0011

0100

0101

0110

0111

1000

1001

1010

1011

1100

1101

1110

1111

CU LY BIT 2

0000

0001

0010

0011

0100

0101

0110

0111

1000

1001

1010

1011

1100

1101

1110

1111

CU LY BIT 3

0000

0001

0010

0011

0100

0101

0110

0111

1000

1001

1010

1011

1100

1101

1110

1111CU LY BIT 4

0000

0001

0010

0011

0100

0101

0110

0111

1000

1001

1010

1011

1100

1101

1110

1111

MSEW mapping[11 4 5 14 1 10 15 8 13 6 3 12 7 16 9 2]

Hnh 5. S nh x Gray modified v MSEW

Do c cc khong cch Euclid khc nhau, mi b nh x smang li cho h thng OFDM-BICM-ID mt c tnh BER theo SNR khc nhau. Cng c th thy rng, mi b nh x tn hiu ch c th cho kt qu BER tt ti mt vng SNR nhtnh. T nhn xt ny, chng ti sut bin php thch nghi mi cho h thng OFDM s dng m BICM-ID. l cn cvo cc gi tr SNR trn mi sng mang OFDM, ta s dngmt phng php nh x khc nhau, m bo c tnh BER tia cho h thng m vn m bo c thng lng thng tin l khng i. Phng php thit k cc b nh x khc nhau c trnh by trong ti liu [14]. Qu trnh m phng tip theo c thc hin minh ho cho hiu qu ca gii php thch nghi trn.

III. M HNH H THNG

3.1. M hnh m phng h thng OFDM S m phng h thng OFDM c xy dng theo m hnh chun HIPERLAN-II, b iu ch 16-QAM s dng m xon(7, [133, 171]) ly tng thch m hnh SIMULINK ca phnmm MATLAB. Khi truyn tn hiu 16QAM qua knh Rice c h s K=4 v dch tn Doppler D=40Hz, ng thi chu tc ng ca tp m

10


11


Gauss ti SNR=10 dB, constellation ca b tn hiu b xoay pha v phn tn n mc khng th nhn ra c (hnh 6.a).

0 5 10 15 20 2510

-7

10-6

10-5

10-4

10-3

10-2

10-1

100

SNR

BER

KET QUA BER HE THONG OFDM HIPERLAN II-16QAM

k=4k=16k=32k=100k=1000Gauss

(a) (b) Hnh 6.(a) Constellation ca b tn hiu 16-QAM trn knh

pha inh Rice vi h s k=4, dch tn D=40Hz, ng thivi tp m Gauss vi SNR=10dB .(b) kt qa BER ca hthng OFDM-16 QAM dng m xon (7,[133,171]) vi k khc nhau.

Cng vi m hnh trn khi k=1000 th kt qu kho st BER ca H thng khi truyn trn knh Rice tim cn vi kt quBER khi truyn trn knh Gauss. Chng ta thy rng h thngOFDM vi b m xon truyn thng ch c th hot ng tttrn knh Gauss hoc knh Rice c h s K > 100 v tng itnh (D

12


2 3 4 5 6 7 8 9 10 11 1210

-4

10-3

10-2

10-1

100

SNR

BE

R

KET QUA BER HE THONG OFDM-BICM-ID 16-QAM-MA (3,[5,7]) LAP 1

SPGrayGraymodifiedMSEWAdaptiveHIPERLAN-II

2 3 4 5 6 7 8 9 10 11 1210

-6

10-5

10-4

10-3

10-2

10-1

100

SNR

BE

R


SPGrayGraymodifiedMSEWAdaptiveHiperlan II

(a) (b)

2 3 4 5 6 7 8 9 10 11 1210

-7

10-6

10-5

10-4

10-3

10-2

10-1

100

SNR

BE

R


SPGrayGraymodifiedMSEWAdaptiveHiperlan II

2 3 4 5 6 7 8 9 10 11 1210

-7

10-6

10-5

10-4

10-3

10-2

10-1

100

SNR

BE

RKET QUA BER HE THONG OFDM-BICM-ID 16-QAM-MA (3,[5,7]) LAP 9

SPGrayGraymodifiedMSEWAdaptiveHIPERLAN-II

(c) (d) Hnh 8. Kt qu BER h thng AOFDM-BICM-ID16-

QAM lp 1, 3, 6, 9 vi cc php nh x tn hiu

Sau 3,6,9 chu k gii m lp, h thng t c cc BER khc nhau ti cc vng SNR khc nhau nh tng ch gii m lp(hnh 6.b,c,d). Lc ny hiu qu thch nghi (c biu dinbng cc ng cong nh du trn) tr nn r rt.Theo kt qu hnh 8 (b) vi BER mc tiu bng 10-4, ch vis vng lp bng 3, h thng thch nghi c tng ch ti 3 dB. Da trn cc kt qu t c, hon ton c th kt lun rngvic xut s dng b m BICM-ID cng nh phng php thch nghi mi cho h thng OFDM vi cc b nh x khc nhau c th mang li nhng tng ch vt tri v t l li bt khi truyn dn qua knh pha inh c s tc ng ng thi canhiu Gauss trong khi vn m bo thng lng ca h thngkhng i l 4bit trn mt sng mang con.

V. K T LU N Da trn c s l thuyt ca OFDM v m BICM-ID, bi bo ny xy dng thnh cng m hnh m phng h thng OFDM-BICM-ID vi cc b nh x 16-QAM khc nhau. Cc kt qu m phng trn khn ch mt ln na chng minh chtlng li bt vt tri ca h thng OFDM-BICM-ID so vi hthng OFDM s dng cc m truyn thng m cn m botc truyn dn khng i trong iu kin knh pha inh chn lc theo tn s.

Gii php thch nghi trn khng ch p dng cho cc h thngOFDM 8-PSK hay 16-QAM m hon ton c th m rng cho cc b iu ch M-QAM bc cao hn. Kt qu nghin cu kho st cht lng cc h thng OFDM-BICM-ID so snh vi vic s dng m Convolution hay Turbo v tng ch ca n trong cc ng dng c th nh Truyn hnh s s c trnh by trong cc bi bo tip theo.

TI LIU THAM KHO [1] S.Hara, R.Prasad, 2003 ''Multicarier Techniques for 4G Mobile

Communications''. [2] L. Hanzo, W. Webb, and T. Keller, Single-and Multi-Carrier

Quadrature Amplitude Modulation. New York: IEEE Press/Wiley, Apr. 2000.

[3] Zhang Zhao-yang, Lai Li-feng,2003 ''A novel OFDM transmission scheme with leng- adptive Ciclic PrefixJournalof Zhejiang University Science ISSN 1009-3095.

[4] X. Li and J. A. Ritcey, Bit-interleaved coded modulation with iterative decoding, IEEE Commun. Lett., vol. 1, pp. 169171, Nov. 1997.

[5] A. J. Viterbi and J. K. Omura, Principles of Digital Communication and Coding. New York: McGraw-Hill, 1979.

[6] E. Zehavi, 16-QAMtrellis codes for a Rayleigh fading channel, IEEE Trans. Commun., vol. 40, pp. 873883, May 1992.

[7] G. Ungerboeck, Channel coding with multilevel/ phase signals, IEEE Trans. Inform. Theory, vol. 28, pp. 5667, Jan. 1982.

[8] G. Caire, G. Taricco, and E. Biglieri, Bit-interleaved coded modula-tion, IEEE Trans. Inform. Theory, vol. 44, pp. 927946, May 1998.

[9] S. Benedetto, D. Divsalar, G. Montorsi, and F. Pollara, "A soft-input soft-output APP module for iterative decoding of concatenated codes", IEEE Commun. Letters, vol. 1, pp. 22-24, Jan. 1997.

[10] X. Li, A. Chindapol, and J. A. Ritcey, "Bit-Interleaved codedmodulation with iterative decoding and 8PSK signaling," IEEE Trans. on Commun., vol. 50, no. 8, pp. 1250-1257, Aug. 2002.

[11] R.Van. Nee, ,OFDM for Wireless Mutimedia Commu., Artech House, Boston, London, 2000.

[12] Cng Hng, inh Th Cng, Nguyn Quc Bnh, Nng cao Chtlng H thng OFDM bng BICM-ID, Chuyn san Cc cng trnh nghin cu- Trin khai Vin thng v Cng ngh thng tin, B Bu chnh Vin thng, thng 2/2007.

[13] Do Cong Hung, Tran Xuan Nam, Dinh The Cuong, Adaptive Mapping for BICM-ID OFDM Systems, Biennial Vietnam conference on Radio and Electronics (REV 2006), November 6-7, 2006.

[14] Cng Hng, inh Th Cng, Nguyn Quc Bnh , Phng php thit k cc b nh x tn hiu cho h thng AOFDM dng m BICM-ID, Tp ch Khoa hc v K thut, Hc vin KTQS, s 117 (IV-2006).

[15] Zhixing Yang, Qiuliang Xie, Kewu Peng, and Jian Song, Labeling Optimization for BICM-ID Systems, IEEE Communications Letters, Vol. 14, No. 11, November 2010.

12


13


Quy hoch tn s cho h thng thng tin di ng th h th 5 ti Vit Nam

on Quang HoanCc Tn s v tuyn in

H Ni, Vit Nam [email protected]

Nguyn Anh Tun Cc Tn s v tuyn in


Tm tt Th gii ang hng ti mng thng tin kt ni rng khp v kt ni mi loi hnh thit b. Thit b thng tin di ng ngy cng a dng v ang l thnh phn thit yu ca cuc sng. Mng thng tin di ng th h th 5 cn phi p ng nhu cu v tc cao v dung lng d liu ln, kt ni nhiu thit b cng lc, tr thp v tin cy cao khi m mng thng tin th h th 4 cha p ng c. Bi bo ny s nh gi li hin trng quy hoch v s dng bng tn cho thng tin di ng ca Vit Nam. ng thi nh gi s tng trng ca th trng thng tin di ng giai on 2011-2014, d bo nhu cu giai on 2015-2020 nh gi nhu cu ph tn i vi thng tin di ng bng rng ca Vit Nam. Da trn cc phn tch ny, bi bo phn tch nhng kh khn v thun li trong vic qun l ti nguyn tn s. Tc gi cng s a ra gii php quy hoch li cc bng tn hin c cho thng tin di ng bng rng v gii php tm kim quy hoch bng tn mi cho thng tin di ng bng rng ca Vit Nam.

Keywords IMT- Advanced, IMT-2020 and beyond, spectrum requirement

I. GII THIU

Nhng mng thng tin di ng th h th 4 (4G) ang c pht trin p ng phn no v nhu cu dch v thng tin v tuyn nh thoi, d liu, hnh nh, video vi tc cao hn. Tuy nhin, trong tng lai ngi dng cn nhng kt ni nhanh hn vi thi gian thc hn, ch vi mt click chut l chng ta s c nhng th mnh cn. Ngha l tr thp v kt ni thng tin thc s l nhng yu cu cho mng thng tin di ng tng lai v cng l p ng xu hng pht trin cc ng dng mi nh l Y t, gio dc, an ninh cng cng, an ton cu nn, vn phng in t, gii tr v nhiu lnh vc khc. Cng vi , ngi s dng cng phi c m bo cung cp dch v tt nht ngay c ni mt thu bao cao, cng s dng ti mt a im v mt thi im. V nh nhng ni mua sm, sn vn ng, l hi v nhng hot ng x hi khc. Ngoi ra, nhng thu bao cn c cung cp dch v thng tin tt nht ngay c khi s dng trn cc phng tin giao thng di chuyn vi tc cao nh tu cao tc, hay l trn my bay. Thm vo , nhng dch v truyn hnh phn gii cao, hnh nh 3D qua mng thng tin di ng ti thit b c nhn cng l mt nhu cu cn tc d liu cao v tnh tc thi ca dch v thng tin.

Mng thng tin tng lai l kt ni tt c my mc thit b bng hnh thc hu tuyn hoc v tuyn. Do , s lng kt ni tng ln rt nhanh, bao gm nhng kt ni gia in thoi thng minh, cm bin thng minh, my nh, phng tin i li, thit b t n gin ti phc tp v hin

i. Tuy nhin, s lng kt ni thit b c nhn ch o s l qua mng v tuyn. Vic kt ni mi loi hnh, phng thc to ra mt mng kt ni rng khp, kt ni mi phng thc, c xem nh l mng kt ni Internet of Things.

Nh vy, mng thng tin v tuyn th h th 5 vi nhu cu cao v tc d liu v thi gian thc, s dn ti nhu cu cao v ph tn. Cng vi l nhu cu v vic p dng cng ngh mi nng cao hiu nng s dng ph tn. Do , trong tng lai ngoi vic chuyn i cng ngh thng tin v tuyn trn cc bng tn hin c c phn b cho thng tin di ng cn phi xem xt ti vic tm kim bng tn mi cho thng tin di ng bng rng. Vic nghin cu nhu cu ph tn cho thng tin di ng bng rng c Lin minh vin thng quc t khi sng, nhiu t chc quc t cng v ang nghin cu. Mc d vy nh gi ng nhu cu ph tn ca mi quc gia l rt khc nhau ty thuc vo iu kin kinh t -x hi . V d nh nhu cu ca nc ang pht trin s rt khc so vi nhu cu ca nhng nc pht trin. Vic tm kim bng tn mi cho thng tin di ng bng rng ngha l s xem xt phn chia li mt s bng tn ang phn chia cho nhng nghip v khcnh truyn hnh, hnh khng, hng hi, v tinh, v tuyn mt t. Ngha l xem xt thu hp cc bng tn ang phn chia cho cc nghip v ny to ra bng tn mi cho thng tin di ng bng rng. y cng l ni dung rt quan trng c bn tho ti Hi ngh v tuyn th gii nm 2015. Ti Hingh ny cc nc thnh vin ca Lin minh vin thng quc t (ITU- International Telecommunication Union) s bn tho v nhng bng tn di 6GHz tim nng c th phn b cho thng tin di ng bng rng. D kin nhng bng tn trn 6GHz s c bn tho ti Hi ngh thng tin v tuyn th gii nm 2019.

Trong ni dung bi bo ny tc gi s tp trung phn tch nh gi hin trng quy hoch v s dng bng tn cho thng tin di ng ca Vit Nam. ng thi d bo nhu cu, tng tng ca th trng thng tin di ng ca Vit Nam. Trong bi vit ny tc gi cng s trnh by phng php tnh ton h s hiu nng s dng ph tn. Cui cng bi bo a ra nhng gii php v nhng yu cu mi trong qun l tn s i vi mng thng tin di ng th h th 5 ti Vit Nam.

II. HIN TRNG QUY HOCH V S DNG BNGTN CHO THNG TIN DI NG TI VIT NAM

Nhng bng tn ang c quy hoch v s dng cho mng thng tin di ng IMT (International Mobile Technology)

13

Hi Tho Quc Gia 2015 v in T, Truyn Thng v Cng Ngh Thng Tin (ECIT 2015)Quy hoch tn s cho h thng thng tin di ng th h th 5 ti Vit Nam

on Quang HoanCc Tn s v tuyn in


Nguyn Anh Tun Cc Tn s v tuyn in


Tm tt Th gii ang hng ti mng thng tin kt ni rng khp v kt ni mi loi hnh thit b. Thit b thng tin di ng ngy cng a dng v ang l thnh phn thit yu ca cuc sng. Mng thng tin di ng th h th 5 cn phi p ng nhu cu v tc cao v dung lng d liu ln, kt ni nhiu thit b cng lc, tr thp v tin cy cao khi m mng thng tin th h th 4 cha p ng c. Bi bo ny s nh gi li hin trng quy hoch v s dng bng tn cho thng tin di ng ca Vit Nam. ng thi nh gi s tng trng ca th trng thng tin di ng giai on 2011-2014, d bo nhu cu giai on 2015-2020 nh gi nhu cu ph tn i vi thng tin di ng bng rng ca Vit Nam. Da trn cc phn tch ny, bi bo phn tch nhng kh khn v thun li trong vic qun l ti nguyn tn s. Tc gi cng s a ra gii php quy hoch li cc bng tn hin c cho thng tin di ng bng rng v gii php tm kim quy hoch bng tn mi cho thng tin di ng bng rng ca Vit Nam.

Keywords IMT- Advanced, IMT-2020 and beyond, spectrum requirement

I. GII THIU

Nhng mng thng tin di ng th h th 4 (4G) ang c pht trin p ng phn no v nhu cu dch v thng tin v tuyn nh thoi, d liu, hnh nh, video vi tc cao hn. Tuy nhin, trong tng lai ngi dng cn nhng kt ni nhanh hn vi thi gian thc hn, ch vi mt click chut l chng ta s c nhng th mnh cn. Ngha l tr thp v kt ni thng tin thc s l nhng yu cu cho mng thng tin di ng tng lai v cng l p ng xu hng pht trin cc ng dng mi nh l Y t, gio dc, an ninh cng cng, an ton cu nn, vn phng in t, gii tr v nhiu lnh vc khc. Cng vi , ngi s dng cng phi c m bo cung cp dch v tt nht ngay c ni mt thu bao cao, cng s dng ti mt a im v mt thi im. V nh nhng ni mua sm, sn vn ng, l hi v nhng hot ng x hi khc. Ngoi ra, nhng thu bao cn c cung cp dch v thng tin tt nht ngay c khi s dng trn cc phng tin giao thng di chuyn vi tc cao nh tu cao tc, hay l trn my bay. Thm vo , nhng dch v truyn hnh phn gii cao, hnh nh 3D qua mng thng tin di ng ti thit b c nhn cng l mt nhu cu cn tc d liu cao v tnh tc thi ca dch v thng tin.

Mng thng tin tng lai l kt ni tt c my mc thit b bng hnh thc hu tuyn hoc v tuyn. Do , s lng kt ni tng ln rt nhanh, bao gm nhng kt ni gia in thoi thng minh, cm bin thng minh, my nh, phng tin i li, thit b t n gin ti phc tp v hin

i. Tuy nhin, s lng kt ni thit b c nhn ch o s l qua mng v tuyn. Vic kt ni mi loi hnh, phng thc to ra mt mng kt ni rng khp, kt ni mi phng thc, c xem nh l mng kt ni Internet of Things.

Nh vy, mng thng tin v tuyn th h th 5 vi nhu cu cao v tc d liu v thi gian thc, s dn ti nhu cu cao v ph tn. Cng vi l nhu cu v vic p dng cng ngh mi nng cao hiu nng s dng ph tn. Do , trong tng lai n