Sum-rate Maximizing Beamforming Design for Distributed-antenna Based Full-duplex Relay Systems
Xu Xiao-fei①② Chen Xiang③ Zhao Ming② Zhou Shi-dong① Wang Jing②
①(Department of Electronic Engineering, Tsinghua University, Beijing 100084, China) ②(National Laboratory for Information Science and Technology, Tsinghua University, Beijing 100084, China) ③(School of Information Science and Technology, Sun Yat-sen University, Guangzhou 510275, China)
Distributed antenna based full-duplex relay system is capable of simultaneous transmission and reception in the same frequency band on two hops, and it provides uniform coverage for cell edge and deep shadow fading areas with increased spectral efficiency. In multiuser scenarios with non-ideal self interference cancellation, beamforming using multiple distributed antennas is proposed to suppress self interference and multiuser interference jointly. A system model for multiuser end-to-end sum-rate maximization under individual power constraints at distributed antennas is established first. Then, a dual-layer iterative algorithm is proposed to resolve the non-convexity of the problem. Simulation results validate the effectiveness of the proposal algorithm, showing that the proposed beamforming design can be used in distributed-antenna based full-duplex relay systems, to suppress both self interference and multiuser interference efficiently, and increase system spectral efficiency significantly.
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