MIMO y channel with imperfect CSI: Impact of training and feedback overhead

Hamideh Zebardast, Xiangyun Zhou, Behrouz Maham

    Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

    1 Citation (Scopus)

    Abstract

    Signal space alignment with network coding (SSA-NC) is a cooperative transmission strategy that, under some conditions such as full channel state information (CSI), provides maximum degrees of freedom (DoF) in two-way relay networks. However, obtaining full CSI for SSA-NC requires a significant amount of training and feedback overhead. This paper focuses on the multiple-input multiple-output (MIMO) Y channel and explicitly considers the required training and feedback at the users and relay. We derive the optimum signaling overhead of this channel to maximize the effective sum-rate of the SSA-NC scheme. We further investigate an important question: under what conditions does the SSA-NC scheme have a better sum-rate performance compared to other popular schemes with lower complexity such as multi-user MIMO (MU-MIMO) and time division multiple access (TDMA)? Since different schemes require different amounts of training/feedback overhead, our result demonstrates how the channel coherence interval plays an important role in their relative performance. Specifically, the SSA-NC scheme outperforms the other schemes only when the coherence interval is sufficiently large. This result highlights the importance of properly taking the training and feedback overhead and channel coherence interval into account when designing the communication scheme for the MIMO Y channel.

    Original languageEnglish
    Title of host publication2016 IEEE International Conference on Communication, Network, and Satellite, COMNETSAT 2016 - Proceedings
    PublisherInstitute of Electrical and Electronics Engineers Inc.
    Pages7-13
    Number of pages7
    ISBN (Electronic)9781509054466
    DOIs
    Publication statusPublished - 21 Apr 2017
    Event5th IEEE International Conference on Communication, Network, and Satellite, COMNETSAT 2016 - Surabaya, Indonesia
    Duration: 8 Dec 201610 Dec 2016

    Publication series

    Name2016 IEEE International Conference on Communication, Network, and Satellite, COMNETSAT 2016 - Proceedings

    Conference

    Conference5th IEEE International Conference on Communication, Network, and Satellite, COMNETSAT 2016
    Country/TerritoryIndonesia
    CitySurabaya
    Period8/12/1610/12/16

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