Achievable degrees of freedom on MIMO two-way relay interference channels

Kwangwon Lee, Namyoon Lee, Inkyu Lee

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

In this paper, we study new network information flow called multiple-input multiple-output (MIMO) two-way relay interference channels where two links of relay systems are interfering with each other. In this system, we characterize the achievable total degrees of freedom (DOF) when all user nodes and relays have M and N antennas, respectively. We provide three different methods, namely, time-division multiple access, signal space alignment for network coding (SSA-NC), and a new interference neutralization (IN) scheme. In the SSA-NC scheme, one relay is selected to fully exploit the dimension of the chosen relay for network coding. For the IN, we propose a new relay transmission scheme where two relays cooperatively design the beamforming vectors so that the interference signals are neutralized at each receiver. By adopting three different relaying strategies, we show that the DOF of max min(4N,2M ), \min (2N,2 ⌊\frac43M ⌋ ), min(2N-1,4M) } is achieved for MIMO two-way relay interference channels.

Original languageEnglish
Article number6463495
Pages (from-to)1472-1480
Number of pages9
JournalIEEE Transactions on Wireless Communications
Volume12
Issue number4
DOIs
Publication statusPublished - 2013 Feb 22

Fingerprint

Interference Channel
Network coding
Multiple-input multiple-output (MIMO)
Relay
Degree of freedom
Network Coding
Time division multiple access
Signal interference
Beamforming
Interference
Antennas
Alignment
Network Flow
Multiple Access
Information Flow
Min-max
Antenna
Division
Receiver
Vertex of a graph

Keywords

  • Degrees of freedom
  • interference channel
  • two-way relay

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Computer Science Applications
  • Applied Mathematics

Cite this

Achievable degrees of freedom on MIMO two-way relay interference channels. / Lee, Kwangwon; Lee, Namyoon; Lee, Inkyu.

In: IEEE Transactions on Wireless Communications, Vol. 12, No. 4, 6463495, 22.02.2013, p. 1472-1480.

Research output: Contribution to journalArticle

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