Title :
Rate-compatible QC-LDPC codes design in powerline communication systems
Author :
Liu, Zaishuang ; Peng, Kewu ; Lei, Weilong ; Qian, Chen ; Wang, Zhaocheng
Author_Institution :
Dept. of Electron. Eng., Tsinghua Univ., Beijing, China
Abstract :
Low-density parity-check (LDPC) codes are an important choice of the error correction codes in broadband powerline communication (PLC) systems. In this paper, a "column extension" design method for rate-compatible quasi-cyclic (QC) LDPC codes is proposed, which can provide efficient multi-rate QC-LDPC schemes for PLC systems. Based on the optimization of degree distributions among multi-rate LDPC codes, excellent performance can be achieved at each code rate. Benefiting from the nested matrix structure, the designed QC-LDPC codes facilitate the implementation of multi-rate encoder/decoder and offer the advantage of low-complexity. A comparison with the QC-LDPC codes in ITU-T G.9960 specification is performed, where the effectiveness of the proposed method and the superior performance of our designed codes are validated via extrinsic information transfer (EXIT) chart analysis and bit error rate (BER) simulations.
Keywords :
broadband networks; carrier transmission on power lines; cyclic codes; error correction codes; error statistics; matrix algebra; optimisation; parity check codes; telecommunication standards; BER; EXIT chart; ITU-T G.9960 specification; QC-LDPC code design; bit error rate; broadband PLC system; column extension design method; degree distribution; error correction codes; extrinsic information transfer; low density parity check; multirate decoder; multirate encoder; nested matrix structure; optimization; power line communication; quasi-cyclic code; Bit error rate; Broadband communication; Decoding; Design methodology; Forward error correction; Parity check codes; Simulation; EXIT chart; PLC; QC-LDPC; Rate-compatible; degree distribution; multi-rate;
Conference_Titel :
Power Line Communications and Its Applications (ISPLC), 2012 16th IEEE International Symposium on
Conference_Location :
Beijing
Print_ISBN :
978-1-4673-0359-0
Electronic_ISBN :
PENDING
DOI :
10.1109/ISPLC.2012.6201311
