频率选择性MIMO信道几何模型及容量分析

Frequency-Selective MIMO Channel Geometry Modeling and Capacity Analysis

为了对收发相关频率选择性多入多出(MIMO)衰落信道容量进行研究,提出了基于区域近似多簇几何双反射信道模型,推导出了多簇收发相关信道的相关系数和收发相关MIMO信道容量的表达式,分析了参数对信道容量的影响.结果表明,收发相关的条件下,MIMO-OFDM系统的信道容量随总角度扩展而增加;信道容量是发射相关矩阵及多个接收时延扩展相关矩阵之和的函数,信道容量随着时延扩展的增加而增加.

For modeling multipath propagation and spatial-temporal fading correlation in frequency-selective channel, multiple input multiple output （MIMO） fading channel model is proposed. It is ab- stracted as a cluster-based double bounce model with multiple receiving taps. The expressions of correlation coefficient and multiple input multiple output-orthogonal frequency division multiplexing （MIMO-OFDM） channel capacity are derived respectively. The effect of spatial temporal correlation on the capacity is investigated for different physical parameters. It is shown that the channel capacity increases with the increasing total angular spread and the capacity is the function of the transmitting correlation matrix and the summation of the entire receiving taps channel matrix. Increasing delay spread taps and cluster angular spread can increase the channel capacity as well.