Dynamic selection for CoMP-JT over correlated MIMO channel with open loop precoding and IRC receiver for LTE-A

Abstract

This paper addresses the problem of Co-channel interference in the presence of fading correlation between transmit and receive antenna pairs. There are two ways for mitigating interference and improving the cell-edge user performance in Long Term Evolution-Advanced (LTE-A) system. First method is coordinated multi-point transmission and reception (CoMP) and second method is interference rejection combining (IRC) receiver. In this paper we propose a joint transmission (CoMP-JT) scheme for LTE-CoMP with open loop cyclic delay diversity (CDD). We enhance the performance of CoMP with dynamic cell selection and compare two schemes for open loop CDD. A cell-edge user selects the base stations that jointly transmit the desired signal from the available ones (we assumed 3). 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, IRC receiver is introduced. In this paper the performance of linear IRC receiver structures is investigated for interference suppression for CoMP-JT with open loop CDD. Simulation results show that the CoMP-JT using open loop MIMO with proposed precoding scheme, in case of cell selection, considerably improves the performance. In addition, using MMSE-IRC gives much better performance than the conventional minimum mean square error (MMSE) in the presence of co-channel interference.