A Novel Network Coding Multi-User Coordinated Multipoint Downlink Transmission Scheme

A novel network coding based coordinated multi- point (NC-CoMP) process, which allows one of the cooperative base stations (BSs) to serve one more non-cell-edge UE simultaneously in its own cell, is proposed in this paper. To implement the NC-CoMP transmission, an alignment combined precoding(ACP) algorithm is designed to eliminate the inter-user interference and simultaneously to extract useful signal from the network coded signals. Two algorithms are presented to optimize the precoding vectors with the aim at maximizing the receive signal-to-noise rate(SNR) of the cell-edge users. Compared with the conventional two UE multi-user coherent joint processing CoMP (CJP-CoMP) scheme, the proposed NC-CoMP scheme can increase the date throughput significantly without requiring any extra resources. Simulations also illustrate that the bit error rate (BER) performance of the cell-edge users can be improved significantly when the NC-CoMP scheme is employed.