Resource Allocation for Analog Network Coding Based Bidirectional Relaying

In this paper, we develop efficient power allocation schemes for bidirectional relaying when analog network coding is used. As compared to unidirectional relaying, analog network coding based bidirectional relaying reduces number of transmissions in the network and increases overall system rate. First, we study optimal power allocation for a three node network where only one relay node is used. Then we propose an efficient power allocation strategy for a general cooperative network architecture where multiple relays are employed to assist the user nodes. Results show significant performance improvement in terms of overall system rate, with increase in the number of relays in the network.