具有线性星座预编码的差分空频码

Differential space-frequency codes with linear constellation precoding

针对传统差分空频码中常模调制符号限制系统编码增益提高的问题,提出具有线性星座预编码的差分空频码。它增大差分空频码字的最小乘积距离,提高系统编码增益。描述了线性星座预编码器的设计原则和设计方法。介绍了归一化差分调制和差分译码。通过对系统平均成对符号误码性能分析,从理论上给出相对传统差分空频码提高的编码增益。仿真实验结果也说明提出的差分空频码能够获取满分集和较大的编码增益。

Aiming at impact on the coding gain by the constant modulus modulated symbols of the tradition- ally differential space-frequency codes, the differential space-frequency codes with linear constellation precoding were proposed. They increased the minimum product distance of codewords and improved the system coding gain. The design method and design principle of linear constellation preorder were described. And normalized differential modulation and differential decoding were introduced. Through analyzing the average pairwise symbol error probability, the improved coding gains compared with traditionally differential space-frequency codes were given in theory. The simulation results also show that the proposed differential space-frequency codes can achieve full diversity and larger coding gain.