Title :
WLC45-2: Application of Nonbinary LDPC Codes for Communication over Fading Channels Using Higher Order Modulations
Author :
Peng, Ronghui ; Chen, Rong-Rong
Author_Institution :
Dept. of Electr. & Comput. Eng., Univ. of Utah, Salt Lake City, UT
fDate :
Nov. 27 2006-Dec. 1 2006
Abstract :
In this paper, we investigate the application of non- binary low density parity check (LDPC) codes over Galois field GF(q) for both single-input single-output (SISO) and multiple- input multiple-output (MIMO) fading channels using higher order modulations. As opposed to the widely studied binary systems that employ joint detection and channel decoding, we propose a nonbinary system where optimal signal detection is performed only once followed by channel decoding. To reduce the complexity of proposed system, we first develop a low complexity LDPC decoding algorithm over GF(q) in the logarithmic domain. We then provide a quasi-cyclic construction of nonbinary LDPC codes which not only allows linear-time encoding, but also gives comparable performance to the best known progressive edge growth (PEG) codes. Our results show that the proposed system that employs regular nonbinary LDPC codes outperforms systems using the best optimized binary irregular LDPC codes in both performance and complexity.
Keywords :
Galois fields; MIMO communication; channel coding; cyclic codes; decoding; linear codes; modulation; parity check codes; Galois field; MIMO channels; channel decoding; fading channels; higher order modulations; joint detection; linear-time encoding; low density parity check codes; multiple-input multiple-output channels; nonbinary LDPC Codes; progressive edge growth codes; quasi-cyclic construction; single-input single-output; Application software; Cities and towns; Fading; Galois fields; Iterative decoding; MIMO; Modulation coding; Numerical stability; Parity check codes; Signal detection;
Conference_Titel :
Global Telecommunications Conference, 2006. GLOBECOM '06. IEEE
Conference_Location :
San Francisco, CA
Print_ISBN :
1-4244-0356-1
Electronic_ISBN :
1930-529X
DOI :
10.1109/GLOCOM.2006.878