Performance of joint transmission CoMP with global precoding matrix and IRC receiver for LTE-A

Coordinated multi-point transmission and reception (CoMP) is one of the most important ways of mitigating interference and improving spectral efficiency for cell edge users in Long Term Evolution-Advanced (LTE-A) system. In this paper we propose a joint transmission scheme for LTE-CoMP where MIMO precoding matrices at the transmission points are jointly (globally) selected to achieve higher capacity. The precoding matrices are jointly chosen by the User Equipment (UE) to fit the independent MIMO channels from two base stations (eNBs). In addition, edge users are likely to be subject to severe Co-channel interference from eNBs outside the joint transmission set. In order to address this issue, interference rejection combining (IRC) receiver is introduced to improve the cell-edge user performance. In this paper the performance of linear IRC receiver structures is investigated for interference suppression for CoMP-JT with local and global precoding matrix for closed loop spatial multiplexing MIMO. Simulation results show that the CoMP-JT with global precoding matrix scheme outperforms local precoding matrix with more than 1 dB. In addition, using MMSE-IRC gives much better performance than the conventional minimum mean square error (MMSE) in the presence of co-channel interference.