Interference Channel With Full-Duplex Amplify-and-Forward Transmitter Cooperations

This paper considers a Gaussian interference channel (IC), where two transmitters send two messages to two receivers respectively. By utilizing the in-band full-duplex (FD) amplify-and-forward (AF) scheme, transmitter cooperations are deployed to enhance the system performance. In particular, each transmitter is capable of listening to its counterpart and then simultaneously transmits both the source signals to achieve higher power gain. Based on the proposed scheme, the equivalent channel model as well as the statistics of the accumulated residual self-interference and noise (ARIN) introduced by the transmitter cooperations and imperfect self-interference (SI) cancellation is analyzed. With the joint and single-user decoding schemes, the corresponding achievable rate regions are derived and a two-stage iterative algorithm is proposed to characterize these regions: in each step, fix the covariance matrix of the interferences and noises, and then adopt a two-step iterative semidefinite relaxation (SDR) method to optimize the two transmitters' transmission parameters, respectively. Simulation results reveal that the proposed scheme can significantly improve the achievable rate under several channel conditions.