Frequency-selective MIMO channel geometry modeling and capacity analysis

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 abstracted 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.