高维调制系统的低复杂度迭代多用户检测  

A Low Complexity Iterative Multiuser Detection Algorithm for High Dimension Modulation System

作　　者：孙宇昊[1] 张庆荣[2] 王刚[1] 李道本[1] 

机构地区：[1]北京邮电大学信息工程学院,北京100876 [2]江南大学通信与控制工程学院,无锡214122

出　　处：《北京邮电大学学报》2006年第2期30-33,共4页Journal of Beijing University of Posts and Telecommunications

基　　金：国家自然科学基金项目(69931050;90604035)

摘　　要：提出了一种可用于高维调制系统的低复杂度迭代接收机算法.此算法分为2步,首先采用迫零(ZF)检测算法获得软符号信息;然后将此软符号信息,在软入软出(SISO)多用户检测器和SISO信道译码器之间迭代,逐步提高检测可靠性.由于SISO多用户检测器基于线性最小均方误差(LMMSE)滤波实现了一种新的软干扰消除技术,使此检测器不限于检测二相移相键控(BPSK)符号,而复杂度只随检测的码字个数呈多项式关系增长.仿真表明,所提迭代算法经2次迭代即可逼近单码最大似然检测(MLD)的性能.A low complexity iterative receiver algorithm was proposed for high dimension modulation system. This algorithm consists of two steps： the first step is zero forcing multiuser detection （MUD） algorithm. The second is performed by a soft-input soft-output （SISO） multiuser detector and a bank of SISO channel decoders through an iterative process. The SISO multiuser detector adopts a novel soft interface cancellation method based on a linear minimum mean-squared error （LMMSE） filter. It makes the detector overcome the limitation of binary phase shift keying （BPSK） while the complexity is polynomial in terms of codes to be detected in the system. Simulation results show that, the performance of the proposed iterative receiver can approach that of a single code system with maximal likeli- hood detection （MLD） only after two iterations.

关 键 词：迭代多用户检测 高维调制 软入软出 

分 类 号：TN911[电子电信—通信与信息系统]