Title :
Iterative ordered-statistic decoding for LDPC coded modulation systems
Author :
Vu, Huy G. ; Nguyen, Ha H. ; Dodds, David E.
Author_Institution :
Dept. of Electr. Eng., Saskatchewan Univ., Saskatoon, Sask.
Abstract :
In this paper, an iterative demodulation/decoding scheme is proposed for coded modulation systems based on low density parity check (LDPC) codes of short block lengths. Here, the LDPC code is decoded by a soft-input soft-output ordered-statistic (SISO-OSD) decoder. The soft-output of the SISO-OSD is used as the a priori probabilities of the demodulator for the next iteration. Simulation results show that the error performance of the iterative demodulation/decoding ordered-statistic decoder is superior to that of the iterative demodulation/decoding sum-product decoder. The performance of the proposed system closely approaches the union bound of the maximum likelihood (ML) decoding with Gray mapping
Keywords :
Gray codes; iterative decoding; maximum likelihood decoding; modulation coding; parity check codes; product codes; statistical analysis; Gray mapping; LDPC coded modulation systems; a priori probabilities; demodulation-decoding scheme; iterative ordered-statistic decoding; low density parity check codes; maximum likelihood decoding; soft-input soft-output ordered-statistic decoder; sum-product decoder; Delay; Demodulation; Fading; Iterative algorithms; Iterative decoding; Linear code; Maximum likelihood decoding; Modulation coding; Parity check codes; Random variables;
Conference_Titel :
Electrical and Computer Engineering, 2005. Canadian Conference on
Conference_Location :
Saskatoon, Sask.
Print_ISBN :
0-7803-8885-2
DOI :
10.1109/CCECE.2005.1556908
