Capacity analysis of high-rank line-of-sight MIMO channels

Abstract: Matrix perturbation theory is utilized to investigate high-rank line of sight multiple input multipleoutput channels in a microwave relay system. The upper and lower bounds of channel capacity are derived based onspace time block codes technique and singular values decomposition. A useful constraint for designing LOS MIMOchannels is developed by the use of the condition number of the MIMO channel matrix. The theoretical analysisof channel capacity is confirmed by the simulation. The results show that the proposed method is able to give aphysical explanation of the high-rank LOS MIMO channel matrix characteristics. Keywords: MIMO channel, matrix perturbation theory, condition number, space time block code. 1. Introduction Multiple input multiple output (MIMO) system hasreceived considerable attention in recent years due toitspotentialtoprovidequantumleapsincapacity [1 − 2] .The researches on MIMO techniques are mostly un-der the dense scattering environment. Limited studieshave addressed the utilization issue of MIMO commu-nicationin stronglineofsight(LOS) componentprop-agation that is incapable of supporting multiple par-allel data streams