Optimal Power Allocation in MIMO Channel

In this paper, we introduce a spatial MIMO channel for modern communication systems. Parameters required in the spatial MIMO channel modeling are studied and the channel is simulated for two types of modeling named “un-polarized” and “cross-polarized” antennas. Then, the channel capacity is computed at different signal to noise ratio. Besides, the channel capacity is analyzed for two different scenarios including high SNR and low SNR. To reach the maximum capacity, the optimal power allocation on antennas is also investigated. The simulation results show that, at low SNR, the power allocation to the sub-channel corresponding to maximum singular value is optimal and equal power allocation to the sub-channels is optimal at high SNR.