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MIMO无线传输系统可以显著提高信道容量,但在实际中,由于相关性的存在会极大影响MIMO系统容量。该文首先引出一个定理,建立空间相关MIMO信道的矩阵模型,在此基础上推导出空间相关MIMO信道遍历容量的上界,得出常量相关模型的信道容量上界以及容量和相关系数的关系,在指数相关模型中得出容量和概率密度的关系,并通过仿真加以验证。
MIMO wireless transmission system can significantly improve the channel capacity, but in practice, due to the existence of the correlation will greatly affect the MIMO system capacity. Firstly, a theorem is derived to establish a matrix model of spatially correlated MIMO channels. Based on this, the upper bound of spatially correlated MIMO channel traversal capacity is derived. The relationship between the upper bound of channel capacity and the capacity and the correlation coefficient of the constant correlation model is obtained. The relationship between capacity and probability density is derived in exponential correlation model and verified by simulation.