Title :
Design of degree distributions for LDPCA codes
Author_Institution :
Dept. of Control Sci. & Eng., Tongji Univ., Shanghai, China
fDate :
7/1/2009 12:00:00 AM
Abstract :
A degree distribution design method of low-density parity-check accumulate (LDPCA) codes is proposed for rate-compatible asymmetric Slepian-Wolf coding (SWC) of correlated binary memoryless sources. The degree distribution is designed by seeking the simultaneous optimum at the lowest and the highest compression rates of the specified range with density evolution algorithm. The experimental results show that the coding efficiency of codes constructed with the designed degree distribution is close to the Slepian-Wolf limit over the entire target range and better than all other reported results of the rate-compatible asymmetric SWC.
Keywords :
parity check codes; LDPCA code; asymmetric Slepian-Wolf coding; binary memoryless source; degree distribution design; density evolution algorithm; low-density parity-check accumulate code; rate-compatible code; Algorithm design and analysis; Automatic repeat request; Channel coding; Design methodology; Optimization methods; Parity check codes; Source coding; Time sharing computer systems; Turbo codes; Rate-compatible codes, distributed source coding, Slepian-Wolf coding, LDPCA codes, LDPC codes.;
Journal_Title :
Communications Letters, IEEE
DOI :
10.1109/LCOMM.2009.090749
