基于传输模式切换的新型自适应空间调制算法

Novel Spatial Modulation Scheme Based on Transmit Mode Switching

提出一种基于传输模式切换的新型自适应空间调制(SM)算法,采用最近邻估计作为系统性能度量的标准,根据信道的状态信息,动态地调整传输模式以最小化系统的成对错误概率,实现在系统频谱利用效率固定和发送功率受限的情况下系统性能的提升。针对SM系统数据传输的特殊性,即一个时刻只有一根发射天线激活来携带数据信息,给出了传输模式切换的简化算法。仿真结果表明,算法实现简单,反馈量小,系统性能优于传统的空间调制方法并且能在高相关信道下工作。

A transmit mode switching （TMS） assisted adaptive spatial modulation （SM） scheme is proposed for multiple-input multiple-output （MIMO） transmission systems. The proposed scheme yields a performance bound with the aid of the nearest neighbor approximation. At a predefined spectral efficiency and transmit power target, the proposed scheme is capable of selecting the appropriate SM mode to minimize the conditioned pairwise error probability. Moreover, a simplified calculation method utilizing the special information transmission method of SM is proposed for mode selection. Simulation results show that the proposed scheme exhibits a better bit error ratio （BER） performance at low complexity cost compared with the conventional SM scheme, especially for the correlated MIMO channels.