EN253 205 (2/2562)Mobile Communication

Introduction toWireless Communication System

ผู้ช่วยศาสตราจารย์ นรารัตน์ เรืองชัยจตุพรสาขาวชิาวศิวกรรมไฟฟ้า คณะวศิวกรรมศาสตร์

มหาวทิยาลัยขอนแก่นOffice: EN04325A, Email: nararat@kku.ac.th

Lecturers• Asst.Prof. Nararat RUANGCHAIJATUPON

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Assessment

Activities %Score

Midterm Test 40

Final Test 40

Assignment 15

Attendance 5

Introduction

• AT&T, the largest telecom company in the world, the core revenue (early 1980s) was from POTS (plain old telephone service)

• In the year 2000, income from wireless industry surpassed income from wired telephone industry

• Worldwide growth of the fixed, wireless, and Internet communication industries

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Mobile Data Usage is increasing

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http://ibnlive.in.com/news/mobile-internet-usage-in-india-outstrips-traffic-from-desktops-report/308772-11.html

Number of smartphone users (worldwide)

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Source: https://www.statista.com/statistics/330695/number-of-smartphone-users-worldwide/

We use our mobile phones for …1.

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In this course, we will study…

• Wireless medium– characteristic and

radio propagation– modulation techniques– coding

• speech coding• diversity channel coding

– multiplexing technique

• Cellular systems– multiple access– interference

management– capacity of wireless

channels– multiuser capacity– Interconnection

components and standards - 3G, 4G, 5G

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PSTN and its extension to cell phone services

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Backbone Infrastructure (1)• PSTN (Public switch telephone network)

– PBX (Private branch exchange)

– Twisted-pair analog telephone

– 64 kbps

– Leased line

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By Kornelia und Hartmut Häfelehttp://www.pixeleye.com/, CC BY-SA 3.0https://commons.wikimedia.org/w/index.php?curid=29308 How to wire?

Telephone Switching Center

Montreal telephone exchange (c. 1895) Modern Central Office

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By btphotosbduk - BDUK Broadband, CC BY 2.0,https://commons.wikimedia.org/w/index.php?curid=40750142

By Various photographers for Cassell & Co. - The Queen's Empire.Volume 3. Cassell & Co. London, Public Domain,https://commons.wikimedia.org/w/index.php?curid=27532259

Backbone Infrastructure (2)• HFC (Hybrid fiber coax)

– Cable TV– Distributed by tapped from the same cable

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A Map of Undersea Fiber Optic Cables

Source: https://www.thefoa.org/PPT/

Voice vs. Data-Oriented Networks

• Fig. 1.5

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Wireless applications

• Voice-oriented– Low-power, low-

mobility, higher quality of voice

• Cordless telephone• Personal

communication services (PCS)

– High-power, large coverage, high-mobility, lower quality of voice

• Cellular systems

• Data-oriented– Local broadband and

ad hoc networks• WLANs• WPANs• High-speed/ad hoc

– Wide area wireless data service(s)

• Internet• Mobile users

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History of Voice-Oriented Wireless Networks

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Development of Voice-Oriented Wireless Networks

• Mobile radio – FDMA

• Advanced Mobile Phone System (AMPS)

• Digital TDMA

• CDMA– IMT-2000

• Wideband CDMA

• Nordic Mobile Telephone (NMT)

• Global System for Mobile Communication (GSM)

• Rapid growth in developing countries

• CDMA/HSPA/HSPA+

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Development of Voice-Oriented Wireless Networks (cont.)

• Local voice-oriented wireless application– Cordless telephone

• CT-2 : first digital cordless telephone (UK, early 1980s)

• DECT – digital European cordless telephone (with wireless PBX)

• PCS (Personal Communication Service)– PHP (Personal Handy Phone), PHS (Personal

Handy System)

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Development of Data-Oriented Wireless Networks

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Development of Data-Oriented Wireless Networks (cont.)

• Wide area wireless data network– ARDIS

• By Motorola&IBM in 1983

– Mobitex• By Ericson in 1986

– CDPD - AMPS• Cellular digital packet data

– GPRS - GSM• General packet radio

service– 3G– Licensed band

• Local broadband and ad hoc networks– WLANs– HIPERLAN

• High Performance Radio LAN

• European Standard

– WPANs• Bluetooth

– Unlicensed band

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Generations of Wireless Networks

• 1G– Voice-oriented analog cellular & cordless telephone

• 2G– Voice-oriented digital cellular & PCS

– Data-oriented wireless WANs & LANs

• 3G– Unified network, packet-switched data services

– Licensed band

– Unlicensed band (USA)

• 4G19

1st Generation

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1st Generation

• AMPS, TACS, NMT-900

• 25 MHz band/each direction

• 800 & 900 MHz

• In practical – band splitting

• FM– Cell size vs. coverage vs. power

• 1G mobile data service– Paging service, one-way short data message

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2nd Digital Cellular Standards

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2nd Generation

• 800-900 MHz band

• FDD

• GSM & IS-95 use multiple analog channels to form one digital carrier

• The number of users (GSM, IS-54, JDC, CDMA)

• Channel bit rate• Power consumption – 100mW average

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2G Mobile Data Service

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Wireless LANs Standards

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3rd Generation

• International standard

• Integrated service

• Quality of voice

• Network capacity

• Data rate

• W-CDMA/OFDM– HSPA/HSPA+

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3rd Generation

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4th Generation

• Voice/Other 3G Services + Mobile Broadband Internet Access

• Mobile WiMAX (56M/128M) / LTE (50M/100M) / LTE-Advanced (500M/1G)

• OFDM

• Thailand’s NBCT has earmarked 1.8 GHz and 2.3 GHz for 4G. The 1.8 GHz is auctioned. The 2.3 GHz spectrum is currently held by TOT.

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5th Generation

• Data rates of several tens of Mb/s

• Tens of thousands of users.

• 1 Gb/s to be offered, simultaneously to tens of workers on the same office floor.

• Several 100,000's simultaneous connections to be supported for massive sensor deployments.

• Femtocell/Internet-of-Things

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Questions?/Discussion?

Source :https://networkencyclopedia.com/personal-communications-services-pcs/

Source : https://www.gamingdose.com/news/samsung-galaxy-fold