Seminar in Summer Vacation

學生：朱峻源指導老師：高永安博士

Outlines

• System Model

• Pulse-Shaping Function

• ICI Analysis

• Simulations in the Paper

System Model1

2 2

0

*

2 ( )

( ) ( )

1 k m[ ]

0 k m

( ) is the time-limited pulse shaping function

1 k m( )

0 k m

c k

k m

Nj f t j f t

kk

k m

j f f t

x t e a p t e

E a a

p t

p t e dt

CFO & ICI (1)

12 ( ) 2(2 )

0

:

( ) ( ) ( )

: ; :

c k

Nj f f t j f tj j ft

kk

the baseband signal of received signal

r t x t e e e a p t e

frequency offset f phase error

CFO & ICI (2)

Frequency function of rectangular, BTRC, and raised-

cosine pulse

ICI Power for different pulse-shaping function (α=0.2)

ICI Power for different pulse-shaping function (α=1)

Conclusion

BTRC pulse-shaping function is better than

the rectangular and the raised-cosine pulse

in ICI reduction.

Reference

Reduced ICI in OFDM Systems Using the

“Better Than” Raised-Cosine Pulse, IEEE

Communication Letter, 2004 March.

ICI Power in different sub-carrier, ε=0.05