移動性對MIMO無線信道性能的影響

提出了MIMO無線信道動態(tài)收發(fā)模型，分析了收發(fā)天線的運(yùn)動對MIMO無線信道空域相關(guān)性及其容量的影響，得出其影響是由收發(fā)天線的初始位置及其運(yùn)動速度決定的，空域相關(guān)性隨天線單元間距增大而減小，隨散射信號角度擴(kuò)展增大不是一致減小，存在使相關(guān)性達(dá)最小的角度擴(kuò)展值，并通過數(shù)值模擬得到了驗(yàn)證，拓展了MIMO散射無線衰落信道模型的研究。
關(guān) 鍵 詞 移動性; MIMO信道; 信道容量; 空域相關(guān)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