正交空时分组码近似性能分析

Approximate Performance Analysis of Orthogonal Space-Time Block Code

在平坦瑞利衰落信道下,提出了3种正交空时分组码(OSTBC)在MPSK和MQAM调制下的近似性能分析方法(分别称为放缩法、矩形法和梯形法),并给出其近似表达式.通过对近似结果的分析,OSTBC能获得满分集增益.仿真结果表明,梯形法近似效果最好.在较小的分段数下,采用梯形法的OSTBC近似性能曲线与理论曲线吻合.在高信噪比条件下,这3种近似性能曲线均能较好地逼近精确性能曲线,并能满足实际工程需求.

Three approximate methods （called as scaling, rectangle and trapezia methods respectively） for performance analysis of orthogonal space-time block code （OSTBC） with M-ary phase shift keying （MPSK） and M-ary quadrature amplitude modulation （MQAM） over flat Rayleigh fading channels are proposed, and their approximate performance expressions are given. The analysis of approximate results shows that OSTBC can obtain full diversity orders. The simulation proves that trapezai method is the best of them. When the segments for trapezia method become very small, the approximate performance curves perfectly agree with the theoretical curves. Under high signal to noise ratio, all approximate curves based on the three methods approach to the exact performance curves, and thus satisfy practical engineering requirements.