A Cooperative Interference Eliminated Mechanism in MIMO Systems

Multiple input multiple output (MIMO) can significantly improve the performance of wireless communication system due to transmission diversity and channel multiplexing. However, because of the use of massive antennas, both enabling technologies suffer from severe interference effects and energy loss problem, especially known as interference between users and energy dissipation caused by transmitter antenna at base station. In this paper, a practical cooperative eliminated interference mechanism is proposed for MIMO wireless communication system. We use the water-filling power algorithms to deal with the energy loss problem at the downlink transmitter. And then we combine the liner precoding algorithm with water-filling power algorithm, to solve the interference effects between users. We take the zero forcing (ZF) precoding algorithm and the maximum message leakage ratio (SLNR) precoding algorithm as an example to study this cooperative eliminated interference mechanism. The design is based on the key observation which is the system capacity and bit error rate. Simulation results show that this cooperative mechanism can improve the system performance better than precoding algorithm and water-filling power algorithm, which are executed individually. In addition, we can find that combining SLNR with water-filing power algorithm improves the system performance better than ZF algorithm.

I. Introduction

The challenge of ever-increasing demands for wireless data is shaping the design, standardization, and development of systems beyond 4G such as Long Term Evolution-Advanced Pro (LTE-Advanced Pro) and 5G systems [1]. For these advanced systems, the use of very large arrays at base stations has been proposed as a very promising way of drastically improving the network capacity [2]. However, MIMO cellular systems suffer from a fundamental interference limitation known as interference signal between users. This interference scene is shown in Fig 1. Considering the existence of multiple antennas between users, mitigating interference becomes more and more important.