Beamforming based on SLR for uplink channel in MU-MIMO system and detection design

Multi-user (MU) techniques are adopted in wireless systems to fully benefit from multiple-input multiple-output (MIMO) antenna array. Beamforming (BF) technique in the MU-MIMO limits the effect of the co-channel interference (CCI) and improves capacity, and quality of service (QoS) of the system. In this study, we propose a new uplink MU-MIMO precoding scheme based on maximizing the signal to leakage ratio (SLR). The SLR based beamforming can exclude the CCI and noise for MU-MIMO mode effectively and can be realized more easily than the traditional ideal SINR based system. Our major assumption for the study is that base station (BS) use ordered successive interference cancellation (OSIC) detection when the channel state information (CSI) of each user is available at the BS and in each user. We propose the maximum-likelihood (ML) method to estimate the received symbols. Promising results from the simulation show that the performance of the proposed scheme over Rayleigh and Rician fading channels is significantly better than the performance of the classical uplink MU-MIMO precoding system. In addition, in our proposed scheme there is no restriction on the number of antennas at the transmitter and receiver comparing with the classical uplink MU-MIMO precoding system. ©2019 by Begell House, Inc.