A DPC based MMSE beamforming design for a MIMO system with interference

In this paper, a Dirty Paper Coding (DPC) based Minimum Mean Square Error (MMSE) beamforming design for a MIMO interference channel has been introduced. It includes signal leakage and linear transmit filters. At each transmitter, MMSE approach has been used comprising the signal with the interference. The simulation results show that the proposed design achieves significant reduction in mean square error (MSE) value as compared to leakage based MMSE approach. An optimal DPC strategy has been used for cancelling causal interference.

I. Introduction

MULTIPLE input multiple output (MIMO) is acquiring an important position and attracted substantial interests toward the next generation wireless communication system. Incrementation in number of antennas betters the capacity and high link reliability. Interference is becoming the main deterrent to wireless communication. Dirty paper coding (DPC) is a nonlinear precoding technique which removes multiuser interference with the help of channel state information (CSI) known to the transmitter. The transmitter knowing the interference represents the same capacity as that of interference free channel.