Maximum SINR Circular Weight Design of Multiple Transmitter Multiple Receiver System

Conventional MIMO (multiple input multiple output) multiuser systems consider communications between one base station (BS) and multiple user terminals (UTs) both in downlink and uplink scenarios.This paper deals with the case in which multiple BSs transmit different data sequence to different target UTs which becomes a MTMR (multiple transmitter multiple receiver) problem, and describes a maximum SINR (signal to interference plus noise ratio) weight design method based on circular optimization.The proposed method assumes the perfect CSI (channel state information) of all users, and adopts the circular weight design technique in which the transmitter or receiver weight of one user is optimized in order while fixing all of the other vectors.Computer simulations under fading conditions show that this strategy is effective also in the MTMR case, and that the performance of the proposed method is better than that of the zero-forcing-based approach.