An Optimized QoS-aware Resource Allocation Scheme for Full-Duplex OFDM Relay Networks with Residual Self-Interference

In full-duplex OFDM relay networks, it is important on how to allocate radio resources optimally under Quality-of-Service(QoS) constraints to improve the network performance and to explore the advantages of the full duplex operation. Considering the existence of residual self-interference in one-way full-duplex OFDM relay networks, this paper proposes an optimized QoS-aware resource allocation scheme, where the user transmission rates are used as QoS constraint. Specifically, in the proposed scheme, in the premise of equal power allocation, a subcarrier allocation algorithm considering QoS constraints is designed. And then, an optimal subcarrier power allocation algorithm is devised according to the SINR equilibrium condition of full-duplex decode-and-forward protocol. Simulation results show that the proposed algorithm can improve the system throughput significantly under given QoS constraints.