Title :
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., Washington Univ., Seattle, WA, USA
Abstract :
A new LDPC coded clustered OFDM system with 16QAM modulation operating over a frequency selective fast fading channel is presented. Various channel estimation methods are studied and pilot-symbol-aided channel estimation with uniquely designed spacing pattern is used to obtain channel side information for fast fading. A BER of 10/sup -6/ is achieved at 12.8 dB 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, it has much better performance in fading channels than the LPDC coded classical OFDM and is much simpler than TTCM-OFDM system.
Keywords :
OFDM modulation; broadband networks; channel coding; channel estimation; dispersive channels; error statistics; fading channels; modulation coding; parity check codes; quadrature amplitude modulation; 100 Hz; 200 Hz; BER; Doppler frequency; LDPC codes; bit error rate; channel estimation; clustered OFDM system; dispersive channels; frequency selective fast fading channels; low density parity check; orthogonal frequency division multiplexing; spacing patterns; wideband systems; Channel estimation; Clustering algorithms; Discrete transforms; Dispersion; Equations; Fading; OFDM; Parity check codes; Robustness; Wideband;
Conference_Titel :
Signals, Systems and Computers, 2002. Conference Record of the Thirty-Sixth Asilomar Conference on
Conference_Location :
Pacific Grove, CA, USA
Print_ISBN :
0-7803-7576-9
DOI :
10.1109/ACSSC.2002.1197168
