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

Kwangwon Lee, Namyoon Lee, Inkyu Lee

    Research output: Contribution to journalArticlepeer-review

    22 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

    Keywords

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

    ASJC Scopus subject areas

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

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