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Open AccessArticle

Beamforming Based Full-Duplex for Millimeter-Wave Communication

by Xiao Liu 1,2,3, Zhenyu Xiao 1,2,3,*, Lin Bai 1,2,3, Jinho Choi 4, Pengfei Xia 5 and Xiang-Gen Xia 6
School of Electronic and Information Engineering, Beihang University, Beijing 100191, China
Collaborative Innovation Center of Geospatial Technology, Wuhan 430079, China
Beijing Key Laboratory for Network-Based Cooperative Air Traffic Management, and Beijing Laboratory for General Aviation Technology, Beijing 100191, China
School of Electrical Engineerng and Computer Science, Gwangju Institute of Science and Technology (GIST), Gwangju 61005, Korea
School of Electronics and Information Engineering and the Key Laboratory of Embedded System and Service Computing, Tongji University, Shanghai 200092, China
Department of Electrical and Computer Engineering, University of Delaware, Newark, DE 19716, USA
Author to whom correspondence should be addressed.
Academic Editors: He (Henry) Chen, Yonghui Li, Kei Sakaguchi and Yong Li
Sensors 2016, 16(7), 1130;
Received: 26 April 2016 / Revised: 9 July 2016 / Accepted: 14 July 2016 / Published: 21 July 2016
(This article belongs to the Special Issue Millimeter Wave Wireless Communications and Networks)
In this paper, we study beamforming based full-duplex (FD) systems in millimeter-wave (mmWave) communications. A joint transmission and reception (Tx/Rx) beamforming problem is formulated to maximize the achievable rate by mitigating self-interference (SI). Since the optimal solution is difficult to find due to the non-convexity of the objective function, suboptimal schemes are proposed in this paper. A low-complexity algorithm, which iteratively maximizes signal power while suppressing SI, is proposed and its convergence is proven. Moreover, two closed-form solutions, which do not require iterations, are also derived under minimum-mean-square-error (MMSE), zero-forcing (ZF), and maximum-ratio transmission (MRT) criteria. Performance evaluations show that the proposed iterative scheme converges fast (within only two iterations on average) and approaches an upper-bound performance, while the two closed-form solutions also achieve appealing performances, although there are noticeable differences from the upper bound depending on channel conditions. Interestingly, these three schemes show different robustness against the geometry of Tx/Rx antenna arrays and channel estimation errors. View Full-Text
Keywords: full duplex; self-interference cancellation; beamforming; millimeter-wave; mmWave full duplex; self-interference cancellation; beamforming; millimeter-wave; mmWave
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Liu, X.; Xiao, Z.; Bai, L.; Choi, J.; Xia, P.; Xia, X.-G. Beamforming Based Full-Duplex for Millimeter-Wave Communication. Sensors 2016, 16, 1130.

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