Iterative Multiuser Receiver Based on Factor Graph for Asynchronous Coded CDMA Systems  

作　　者：张爱萍 Luo Hanwen Wang Haoxing 

机构地区：[1]Department of Electronic Engineering, Shanghai Jiaotong University, Shanghai 200030, P.R.China

出　　处：《High Technology Letters》2003年第1期41-46,共6页高技术通讯（英文版）

基　　金：the National Science Foundation of China and Key Subject Project of the Ministry of Education.

摘　　要：Factor graph, so named because it graphically represents function factorization, with which and its sum-product algorithm the iterative algorithm can be derived clearly. An iterative multiuser receiver based on factor graph for asynchronous coded CDMA system is proposed. In this paper, the a posteriori probability of users information bits conditioned on the noise-whitening filters output is represented by factor graphs, after numbers of iterations with the sum-product algorithm the information bits are estimated. The authors also propose a reduced complexity algorithm. Simulation results show that with this proposed receiver, near-single-user performance can be achieved, and small performance degradation for the reduced complexity algorithm with significant complexity reduction.Factor graph, so named because it graphically represents function factorization, with which and its sum-product algorithm the iterative algorithm can be deri ved clearly. An iterative multius-er receiver based on factor graph for asynchronous coded CDMA system is proposed. In this paper, the a posteriori probability of users information bits conditioned on the noise-whitening filters output is represented by factor graphs, after numbers of iterations with the sum-product algorithm the information bits are estimated. The authors also propose a reduced complexity algorithm. Simulation results show that with this proposed receiver, near-single-user performance can be achieved, and small performance degradation for the reduced complexity algorithm with signifi-cant complexity reduction.

关 键 词：multiuser detection iterative algorithm multiuser decoding 

分 类 号：TN929.533[电子电信—通信与信息系统]