Outage performance of MIMO two-way AF relaying with end-to-end antenna selection

We consider an end-to-end antenna selection (E2E-AS) scheme for a multiple-input multiple-output (MIMO) two-way relaying system with amplify-and-forward (AF) based relay terminal between two source terminals, each having multiple antennas. The proposed E2E-AS strategy involves selecting a single best antenna at each terminal of the system. Under a Rayleigh flat-fading environment, we present exact and asymptotic expressions of the overall system outage probability. We show that with single-antenna selection at each terminal, the underlying strategy achieves the same diversity order as the scheme using all the available antennas. We also highlight the impact of relay location and power allocation on the overall system outage performance. Finally, we provide numerical and simulation results to confirm the theoretical analysis and the performance of the proposed scheme.