Performance Analysis and Optimization of Interference limited Multi-Antenna BRN

Abstract

This paper investigates the outage performance of multiple antenna bidirectional relaying network (BRN) in the presence of co-channel interference (CCI). Herein, multi-antenna sources exchange information bi-directionally with the help of a single-antenna relay terminal. Under such scenario, we evaluate and compare the performance of two amplify-and-forward based multi-antenna transmission strategies viz., beamforming (BF) and antenna selection (AS). We derive the tight upper bound expressions of end outage probability (OP) for both the strategies over Rayleigh fading channel. We further conduct asymptotic analysis to examine the achievable diversity order of the considered system. To gain more insights, we analyze the power optimization problem to minimize the OP for different scenarios. Finally, Monte-Carlo simulation results are given to attest our theoretical analysis. Our finding suggests that the BF overperform the AS scheme at the expense of additional complexity.