Power Allocation of Distributed Space-Time Codes Based on Self-Coding in FD Two-Way Relay Networks

In this paper, a power allocation space-time coding scheme based on self-coding of residual loop interference (RLI) for two-way full-duplex (FD) amplify-and-forward (AF) relaying networks is proposed. In the proposed scheme, the relay first realizes a distributed space-time code by performing self-coding using the RLI at relay node after implementing some self-interference cancellation techniques. Then power allocation is performed between the terminals. With the proposed power allocation scheme, both amplifying factor and transmit powers of terminal nodes are jointly optimized under a total power constraint when estimated instantaneous channel state information is available. Simulation results show that the proposed scheme achieves performance improvement in an FD relaying system.