MIMO Multiway Relaying with Pairwise Data Exchange: A Degrees of Freedom Perspective

doi:10.1109/TSP.2014.2347924

	MIMO Multiway Relaying with Pairwise Data Exchange: A Degrees of Freedom Perspective
	Wang, Rui 1; Yuan, Xiaojun2
	2014-10-15
会议录名称	IEEE TRANSACTIONS ON SIGNAL PROCESSING
ISSN	1053-587X
卷号	62
期号	20
页码	5294-5307
DOI	10.1109/TSP.2014.2347924
摘要	In this paper, we study achievable degrees of freedom (DoF) of a multiple-input multiple-output (MIMO) multiway relay channel (mRC) where K users, each equipped with M antennas, exchange messages in a pairwise manner via a common N-antenna relay node. A novel and systematic way of joint beamforming design at the users and at the relay is proposed to align signals for efficient implementation of physical-layer network coding (PNC). It is shown that, when the user number K=3, the proposed beamforming design can achieve the DoF capacity of the considered mRC for any (M,N) setups. For the scenarios with K>3, we show that the proposed signaling scheme can be improved by disabling a portion of relay antennas so as to align signals more efficiently. Our analysis reveals that the obtained achievable DoF is always piecewise linear, and is bounded either by the number of user antennas M or by the number of relay antennas N. Further, we show that the DoF capacity can be achieved for {M/N (0,K-1/K(K-2)] and {M/N [{1/K(K-1)+1\2) , which provides a broader range of the DoF capacity than the existing results. Asymptotic DoF as K→ is also derived based on the proposed signaling scheme. © 2014 IEEE.
关键词	Network coding Electric relays Beamforming Codes (symbols) Degrees of freedom (mechanics) Network layers Channel coding Electronic data interchange MIMO systems Telecommunication repeaters Feedback control Piecewise linear techniques Efficient implementation Joint beamforming Multi-way relaying Physical layer network coding (PNC) Piecewise linear Relay channels Signal spaces User number
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收录类别	EI
语种	英语
出版者	Institute of Electrical and Electronics Engineers Inc., United States
EI入藏号	20161002077092
EI主题词	Antennas
EISSN	1941-0476
EI分类号	704.1 Electric Components ; 711.2 Electromagnetic Waves in Relation to Various Structures ; 716.1 Information Theory and Signal Processing ; 722.3 Data Communication, Equipment and Techniques ; 723 Computer Software, Data Handling and Applications ; 723.2 Data Processing and Image Processing ; 731.1 Control Systems ; 921.4 Combinatorial Mathematics, Includes Graph Theory, Set Theory ; 931.1 Mechanics
原始文献类型	Conference article (CA)
引用统计
文献类型	会议论文
条目标识符	https://kms.shanghaitech.edu.cn/handle/2MSLDSTB/251780
专题	信息科学与技术学院_PI研究组_袁晓军组
作者单位	1.Institute of Network Coding, Chinese University of Hong Kong, Hong Kong; 2.School of Information Science and Technology, ShanghaiTech University, Shanghai; 200031, China
推荐引用方式 GB/T 7714	Wang, Rui,Yuan, Xiaojun. MIMO Multiway Relaying with Pairwise Data Exchange: A Degrees of Freedom Perspective[C]:Institute of Electrical and Electronics Engineers Inc., United States,2014:5294-5307.