Maximum MIMO Capacity of Rice Channel

In this paper, we investigate the capacity limits of Multiple-Input, Multiple-Output (MIMO) communication systems in Rice environments. Under this scenario, In Rice environments the channel response matrix is modeled as the weighted sum of the Line-of-Sight (LOS) and the Non-Line-of-Sight (NLOS) matrices. The LOS transmission matrix is used in a Ricean fading channel model which incorporates spatial correlation between the NLOS components, and performance is evaluated with respect to the average capacity. There are many factors impact the capacity, while the antenna spacing is considered in detail. We derive the criteria for the maximum theoretical capacity in terms of the positioning of the antenna elements in a way that can help in the design of optimal MIMO architectures. Different displacement of antennas can impact the channel rank, the capacity becomes larger when the rank increases. In this paper, we compare the Uniform Linear Arrays (ULAs) and the Uniform Circular Arrays (UCAs), in order to get the impact on capacity of the different displacement of the antennas.