title: Beamforming Based Full-Duplex for Millimeter-Wave Communication.
abstract: 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.
authors.affiliation: School of Electronic and Information Engineering, Beihang University, Beijing 100191, China. eeliuxiao@buaa.edu.cn.|Collaborative Innovation Center of Geospatial Technology, Wuhan 430079, China. eeliuxiao@buaa.edu.cn.|Beijing Key Laboratory for Network-Based Cooperative Air Traffic Management, and Beijing Laboratory for General Aviation Technology, Beijing 100191, China. eeliuxiao@buaa.edu.cn.
authors.forename: Xiao
authors.initials: X
authors.lastname: Liu
authors.affiliation: School of Electronic and Information Engineering, Beihang University, Beijing 100191, China. xiaozy@buaa.edu.cn.|Collaborative Innovation Center of Geospatial Technology, Wuhan 430079, China. xiaozy@buaa.edu.cn.|Beijing Key Laboratory for Network-Based Cooperative Air Traffic Management, and Beijing Laboratory for General Aviation Technology, Beijing 100191, China. xiaozy@buaa.edu.cn.
authors.forename: Zhenyu
authors.initials: Z
authors.lastname: Xiao
authors.affiliation: School of Electronic and Information Engineering, Beihang University, Beijing 100191, China. l.bai@buaa.edu.cn.|Collaborative Innovation Center of Geospatial Technology, Wuhan 430079, China. l.bai@buaa.edu.cn.|Beijing Key Laboratory for Network-Based Cooperative Air Traffic Management, and Beijing Laboratory for General Aviation Technology, Beijing 100191, China. l.bai@buaa.edu.cn.
authors.forename: Lin
authors.initials: L
authors.lastname: Bai
authors.affiliation: School of Electrical Engineerng and Computer Science, Gwangju Institute of Science and Technology (GIST), Gwangju 61005, Korea. jchoi0114@gist.ac.kr.
authors.forename: Jinho
authors.initials: J
authors.lastname: Choi
authors.affiliation: School of Electronics and Information Engineering and the Key Laboratory of Embedded System and Service Computing, Tongji University, Shanghai 200092, China. pengfei.xia@gmail.com.
authors.forename: Pengfei
authors.initials: P
authors.lastname: Xia
authors.affiliation: Department of Electrical and Computer Engineering, University of Delaware, Newark, DE 19716, USA. xianggen@udel.edu.
authors.forename: Xiang-Gen
authors.initials: XG
authors.lastname: Xia
keywords: beamforming; full duplex; millimeter-wave; mmWave; self-interference cancellation