Performance of Two-Way AF MIMO Relay Networks with Single and Multiple Antenna Selection Schemes

Abstract

The performance of amplify-and-forward (AF) multi-input multi-output (MIMO) two way relaying networks (TWRNs) with multiple antenna selection scheme at the sources, while having single antenna selection at the relay node is investigated to maximize the effective signal-to-noise ratio (SNR) over flat Rayleigh fading channel. Both exact and asymptotic expressions for the sum outage probability are derived and verified through Monte Carlo simulation results. The diversity order of selection scheme is proven to be minimum of the number of antennas of the source with larger antennas and the product of the number of relay antennas with the number of antennas of the source having fewer antennas. It is shown that fewer antennas at the sources can be selected to reduce the complexity without a significant loss in performance with respect to full antenna usage, i.e., with respect to beamforming. Primary factors which affect optimum relay location are also determined.