Outage probability of two-way AF relaying in the presence of channel estimation error and Co-Channel interference

In this paper, we analyze the outage probability of two-way amplify-and-forward (AF) relaying in the presence of channel estimation error and co-channel interference over Rayleigh fading channel. Firstly, based on the derived effective signal-to-interference-plus-noise ratio (SINR), closed-form expressions for the cumulative distribution function (CDF) of the effective SINR and the outage probability are presented. In addition, an accurate asymptotic expression for the outage probability is derived for simplicity. Finally, in order to mitigate the negative impact of channel estimation error and co-channel interference, we propose an adaptive power allocation to achieve the trade-off of outage probability between two source nodes. Numerical results confirm that our theoretical analysis for outage probability is very accurate.