Multi‐user two‐way relaying in the presence of co‐channel interference

Abstract

This study investigates the impact of co‐channel interference caused by external terminals on multi‐user bi‐directional amplify‐and‐forward based wireless relaying network. The investigation considers multi‐user pair and a single bi‐directional relay terminal and a finite number of co‐channel interference in the system model. A lower bound on the end‐to‐end outage probability is derived for the simultaneous transmission and the opportunistic source‐pair selection strategy. According to analytical, asymptotic, and Monte‐Carlo based computer simulation results, the opportunistic source‐pair selection strategy achieves a near‐optimal performance for the inter‐cell interference caused by other user‐pairs within the system. Results also show that the opportunistic source‐pair selection strategy also achieves optimal diversity order, which is equal to N, in high signal‐to‐noise ratio regimes. Results also show that the co‐channel interference degrades the achievable diversity order from N to 0 while also affecting the system coding gain.