空时分组码的简化译码方法

Simplified Decoding Algorithm of Space-Time Block Codes

实际无线通信应用中,译码方法的简化一定程度上降低了移动端的功率消耗。文章根据星座图的几何结构,从数学角度出发,描述了一种8进制相移键控(8PSK)下空时分组码的简化最大似然(ML)译码方法,并将该方法推广到幅度相移键控(APSK)映射情况下的译码。对最大似然译码方法和文中简化最大似然方法的仿真结果及译码计算复杂度进行了分析和比较,结果表明简化最大似然译码算法只是降低了计算复杂度,并没有影响误码率。

For an actual implementation of wireless communication,the simple decoding,to a certain extent ,reduces power dissipation of mobile station.Based on the geometric structure of constellation,the paper depicts a simplified Maximum Likelihood(ML )decoding algorithm of Space-Time Block Codes for8-Mary Phase Shift Keying(8PSK)from the point of view of math,and extends the algorithm to the simple decoding for Amplitude Phase Shift Keying(APSK).Comparing with the results and analyzing the computing complexities of Maximum likelihood decoding algorithm and the simplified decoding algorithm of the paper,it shows that the simplified algorithm has a lower computing complexities but without influencing the symbol error rate.