移动性对MIMO无线信道性能的影响

提出了MIMO无线信道动态收发模型，分析了收发天线的运动对MIMO无线信道空域相关性及其容量的影响，得出其影响是由收发天线的初始位置及其运动速度决定的，空域相关性随天线单元间距增大而减小，随散射信号角度扩展增大不是一致减小，存在使相关性达最小的角度扩展值，并通过数值模拟得到了验证，拓展了MIMO散射无线衰落信道模型的研究。
关 键 词 移动性; MIMO信道; 信道容量; 空域相关性

Abstract Based on multiple-input-multiple-output (MIMO) scattering wireless fading channel model, a dynamic receiving and transmitting model for MIMO wireless channels is proposed in this paper, which is used for analyzing the impact of mobility of transceiver antennas on spatial correlation and capacity of MIMO wireless channels. The results show that the effects are determined by the original positions of transceiver antennas and by their velocity. The simulation results validate this impact and point out that there exists an optimum angular spread that forces spatial correlation, which decreases with increasing antenna spacing and does not consistently decrease with increasing angular spread, to reach minimum.
Key words mobility; MIMO channels; channel capacity; spatial correlation