Optimal precoding for full-duplex base stations under strongly correlated self-interference channels

• Published in: Frontiers of information technology & electronic engineering Vol. 18; no. 6; pp. 808 - 816
• Main Authors: Wang, Jun, Wen, Xiao-jie, Huang, Chuan, Qing, Chao-jin
• Format: Journal Article
• Language: English
• Published: Hangzhou Zhejiang University Press 01.06.2017; Springer Nature B.V
• Subjects: Algorithms; Antennas; Approximation; Arrays; Communications Engineering; Computer Hardware; Computer Science; Computer Systems Organization and Communication Networks; Convex analysis; Convexity; Electrical Engineering; Electronics and Microelectronics; Engineering; Frequencies; Instrumentation; Interference; Networks; Optimization; Radio equipment; Strongly correlated self-interference channel; Linear precoding; Achievable rate region; TN92; Full-duplex
• ISSN: 2095-9184; 2095-9230
• DOI: 10.1631/FITEE.1700022

We study the optimal precoding for a full-duplex （FD） system, where one FD multi-antenna base station （BS） respectively transmits to and receives from two half-duplex single-antenna mobile users （MUs） on the same time slot and frequency band. At the FD BS, the received signal from the desired MU is severely affected by the extremely strong self-interference （SI） from its transmit antennas to the receive antennas. In the presence of residual SI after imperfect SI cancellation, the downlink transmission rate maximization problem subject to a targeted uplink rate is formulated as a non-convex optimization problem to characterize the achievable rate region for the considered system. Considering the case in which the SI channel is strongly correlated, the above problem is transformed into a convex problem by exploiting the rank-one property of the SI channel, which can be solved efficiently. Finally, numerical results validate the effectiveness of the proposed scheme.