Title :
Boosts to LDPC-coded IDMA systems
Author :
Zhang, X. ; Bie, Z. ; He, Z. ; Wu, W.
Author_Institution :
Beijing Univ. of Posts & Telecommun., Beijing
Abstract :
A node-by-node joint multi-user iterative decoding strategy, instead of the detector-decoder loop strategy, is proposed based on the factor graph representation of the LDPC-coded IDMA system. To analyse the proposed iterative decoding process, a Gaussian approximation based density evolution algorithm is designed. The degree distributions of LDPC codes are optimised for the IDMA system when the system bandwidth efficiency is 1.
Keywords :
Gaussian processes; approximation theory; graph theory; interleaved codes; iterative decoding; multi-access systems; parity check codes; Gaussian approximation; LDPC-coded IDMA systems; degree distribution; density evolution algorithm; factor graph representation; interleave-division multiple-access ssytem; low-density parity-check codes; node-by-node joint multiuser iterative decoding strategy;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:20083257
