Improved algorithm for joint detection and decoding on the joint sparse graph for CDMA systems
Lei Wen, Jing Lei, Man Su · IET Communications · 2016
Joint sparse graph for code division multiple access systems (JSG‐CDMA) combines multiple accessing (low‐density signature) and forward error correction (low‐density parity check code) techniques, and it achieves satisfactory performance under overloaded conditions. In this study, the authors carry on the research on the joint detection and decoding for JSG‐CDMA, and analyse the syndrome effect of message passing on the JSG by the extrinsic information transfer (EXIT) chart. An improved algorithm for joint detection and decoding on the JSG‐CDMA receiver is proposed, and the convergence behaviour of the algorithm is analysed by EXIT chart. Simulation results show that improved algorithm enhance the system performance significantly with a marginal increase of the computational complexity.