Performance of clustered OFDM with low density parity check codes over dispersive channels

Author

Niu, Huaning ; Shen, Manyuan ; Ritcey, James A. ; Liu, Hui

Author_Institution

Dept. of Electr. Eng., Univ. of Washington, Seattle, WA, USA

Volume

2

fYear

2002

fDate

3-6 Nov. 2002

Firstpage

1852

Abstract

We present a new low density parity check (LCPC) coded clustered orthogonal frequency division multiplexing (OFDM) system with 16QAM modulation operating over a frequency selective fast fading channel. Various channel estimation methods are studied and pilot-symbol-aided channel estimation with uniquely designed spacing pattern is used to obtain channel side information in fast fading. A BER of 10/sup -6/ is achieved at 12.8dB with Doppler frequency f/sub m/ = 200 Hz and 14.8 dB with f/sub m/ = 100 Hz. The overall capacity of this system is about 1.56 bit/s/Hz. Compared with other wideband systems, our design has much better performance in fading channels than the LDPC coded classical OFDM and is much simpler than TTCM-OFDM system.

Keywords

OFDM modulation; channel capacity; channel estimation; error statistics; fading channels; modulation coding; parity check codes; 16QAM; BER; Doppler frequency; LDPC coded clustered OFDM system; TTCM-OFDM system; UNITS channel; channel estimation methods; channel side information; clustered OFDM performance; density parity check codes; dispersive channels; frequency selective fast fading channel; orthogonal frequency division multiplexing; pilot-symbol-aided channel estimation; spacing pattern; system capacity; wideband systems; Channel estimation; Clustering algorithms; Discrete transforms; Dispersion; Fading; Frequency conversion; OFDM; Parity check codes; Robustness; Wideband;

fLanguage

English

Publisher

ieee

Conference_Titel

Signals, Systems and Computers, 2002. Conference Record of the Thirty-Sixth Asilomar Conference on

Conference_Location

Pacific Grove, CA, USA

ISSN

1058-6393

Print_ISBN

0-7803-7576-9

Type

conf

DOI

10.1109/ACSSC.2002.1197095

Filename

1197095