SINR and Capacity Analysis for Multiuser MIMO Interference Channels

Abstract

Abstract Multiple-Input-Multiple-Output (MIMO) has a significant effect on wireless communications due to providing high capacity and low BER as compared to the conventional wireless communications with SISO. Due to transmitting a large number of an independent signal from different users in different space-time approach, the BER performance suffers inferiority leading to decreasing in the system reliability. So, our work is based on maximizing the SINR of a multiuser (MU)-MIMO system by sending separate data of different users from one base station (BS) via a number of antennas with different time slots to a number of mobile stations (MS) each with more than one antenna technique. The proposed work considers one user as a desired user and others as interferer users when these data are propagating in multipath fading channel. BER performance as well as channel capacity for various diversity systems such as 2×2 and 4×4 are simulated. The numerical results obtained by computer simulation show that implementing 4×4 MIMO system gives gain of 1 dB as compared to the system implemented with 2×2 MIMO. The results show that when the 10 users communicate with the BS required SINR of 18 dB at 10−2 BER while for 20 users it requires a SINR of 20 dB at BER of 10−2. We can conclude that the BER is decreased and the capacity is increased with increasing the number of antennas when the system is under multiuser and multipath interferences.