Analysis for NOMA-CoMP-JT global precoding matrix and IRC receiver for LTE-A

Abstract

Non-orthogonal multiple access (NOMA) is considered a promising multiple access scheme in the fifth generation (5G). NOMA is used for improving spectrum efficiency and massive connectivity. In this paper, the performance of NOMA with coordinated multi-point transmission and reception (CoMP) is investigated. NOMA-CoMP is combined with interference rejection combining (IRC) receiver for closed loop spatial multiplexing multiple input multiple output (MIMO). Also, the far user selects the closed loop precoding matrices for MIMO in a joint fashion to fit the independent MIMO channels from two base stations (eNBs). Moreover, a comparison between NOMA with CoMP and NOMA without CoMP for different modulation schemes is clarified. The geometric mean and fixed power allocation are proposed. The effect of fading correlation between elements of transmit and receive antennas is illustrated. The effect of different distance ratio between remote eNB and near user of serving cell is considered. Simulation results show that the NOMA-CoMP with global precoding matrix scheme outperforms NOMA without CoMP. In addition, when the distance ratio between remote eNB and near user of serving cell is increased, the performance of system improves because the interference from remote eNB decreases. Moreover, the performance improves when serving cell has lager size compared to remote cell size.