Abstract: In order to improve communication system performance in wireless fading channel, this paper proposes LDPC coded Signal Space Diversity(LDPC-SSD) with precoding system. The signal space diversity rotation matrix is considered as an encoder with code rate equal to 1. In this system, a precoder is added before the signal space diversity matrix. At the same time, three pre-encoder design criteria are given. The pre-encoded LDPC-SSD system is simulated in wireless fading channel. Simulation results show that the proposed scheme has better performance than those without pre-encoded LDPC-SSD system in wireless fading channel.

Key words: Signal Space Diversity(SSD), quasi-cyclic LDPC codes, rotation matrix, diversity order, precoding

摘要： 为有效提高通信系统在无线衰落信道中的性能，提出一种基于预编码的低密度奇偶校验码编码的信号空间分集(LDPC-SSD)系统。将信号空间分集旋转矩阵看作一个码率为1的编码器。在信号空间分集矩阵前加入一个预编码器。给出预编码器的3个设计准则。在无线衰落信道下，仿真基于预编码的LDPC-SSD系统。仿真结果表明，该方案比没有预编码的LDPC-SSD系统在衰落信道下具有更好的性能。

关键词: 信号空间分集, 准循环低密度奇偶校验码, 旋转矩阵, 分集阶数, 预编码

CLC Number: 

• TN911.7