Boosts to LDPC-coded IDMA systems
Xiaoguang Zhang, Zhisong Bie, Zhiqiang He, W. Wu · Electronics Letters · 2008
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.