Title :
Repeat Accumulate Codes for Bit-Interleaved Coded Modulation with Iterative Demapping
Author :
Han, Wei Kwang ; Le Goff, Stephane Y. ; Sharif, Bayan S.
Author_Institution :
Sch. of Electr., Newcastle Univ., Newcastle upon Tyne, UK
Abstract :
Repeat accumulate (RA) codes combine both the advantages of turbo codes and low-density parity-check (LDPC) codes by having low encoding complexity of turbo codes with low decoding complexity of LDPC codes. The RA interleaver is chosen by random construction using the bit-filling method. In this paper, we investigate the performance of bit interleaved coded modulation (BICM) with iterative decoding for bandwidth-efficient transmission. The performance of BICM with iterative decoding and demapping (BICM-ID) is also investigated. The choice of channel code and signal constellation mapping is selected for achieving close to optimum performance. Both BICM and BICM-ID systems using systematic RA codes with Gray labelling on an AWGN channel are considered. Simulation results are presented for 16-QAM examples for rates ¿ and ¿.
Keywords :
AWGN channels; Gray codes; interleaved codes; iterative decoding; modulation coding; parity check codes; quadrature amplitude modulation; turbo codes; 16-QAM; AWGN channel; Gray labelling; LDPC codes; bandwidth-efficient transmission; bit interleaved coded modulation; channel code; iterative decoding; iterative demapping; low-density parity-check codes; repeat accumulate codes; signal constellation mapping; turbo codes; AWGN channels; Channel coding; Constellation diagram; Demodulation; Interleaved codes; Iterative decoding; Labeling; Modulation coding; Parity check codes; Turbo codes; Channel coding; Communication systems; Decoding; Demodulation; Message passing;
Conference_Titel :
Signal Processing and Communications, 2007. ICSPC 2007. IEEE International Conference on
Conference_Location :
Dubai
Print_ISBN :
978-1-4244-1235-8
Electronic_ISBN :
978-1-4244-1236-5
DOI :
10.1109/ICSPC.2007.4728626
