NDLI: Wireless MIMO switching with trusted and untrusted relays: Degrees of freedom perspective

Content Provider	IEEE Xplore Digital Library
Author	Fanggang Wang Xiaojun Yuan Jemin Lee Quek, T.Q.S.
Copyright Year	2015
Description	Author affiliation: Singapore Univ. of Technol. & Design, Singapore, Singapore (Jemin Lee; Quek, T.Q.S.) \|\| Sch. of Inf. Sci. & Technol., ShanghaiTech Univ., Shanghai, China (Xiaojun Yuan) \|\| State Key Lab. of Rail Traffic Control & Safety, Beijing Jiaotong Univ., Beijing, China (Fanggang Wang)
Abstract	We investigate the degrees of freedom (DoF) and secrecy DoF for a general framework of multiway relay networks named wireless MIMO switching, where a number of users exchange information via a common relay. Each round of data exchange consists of one uplink transmission from users to relay and one downlink transmission from relay back to users. The data exchange model is unicast, i.e., every user transmits one message and intends to receive one message from one other user. We categorize unicast patterns using the notion of orbit borrowed from abstract algebra. Roughly speaking, an orbit is a minimum subset of users such that data exchange is closed within this subset. We analyze the achievable DoF of wireless MIMO switching with various numbers of orbits. Particularly, the DoF capacity for unicast with one and two orbits are established. Furthermore, we study communication secrecy with an untrusted relay in wireless MIMO switching. We present an achievable secrecy sum rate and the corresponding achievable secrecy DoF by assuming a non-regenerative relay. Then, we focus on unicast patterns with one and two orbits, and show that this achievable lower bound is actually the secrecy DoF capacity based on a novel genie-aided technique. Our results build a bridge between the DoF and the secrecy DoF in multiway relaying. The methodology of the proof can be generally applied to analyze the secrecy DoF in other relay networks.
Starting Page	4943
Ending Page	4948
File Size	665055
Page Count	6
File Format	PDF
e-ISBN	9781467364324
DOI	10.1109/ICC.2015.7249106
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-06-08
Publisher Place	UK
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Relays MIMO Switches Wireless communication Orbits Unicast Communication system security secrecy sum rate Degrees of freedom MIMO switching physical-layer network coding multiway relay
Content Type	Text
Resource Type	Article

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