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 contribution

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 - Apr 21 2017
Event5th IEEE International Conference on Communication, Network, and Satellite, COMNETSAT 2016 - Surabaya, Indonesia
Duration: Dec 8 2016Dec 10 2016

Conference

Conference5th IEEE International Conference on Communication, Network, and Satellite, COMNETSAT 2016
CountryIndonesia
CitySurabaya
Period12/8/1612/10/16

Keywords

  • channel estimation
  • MIMO Y channel
  • signal space alignment
  • wireless network coding

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Hardware and Architecture

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  • Cite this

    Zebardast, H., Zhou, X., & Maham, B. (2017). MIMO y channel with imperfect CSI: Impact of training and feedback overhead. In 2016 IEEE International Conference on Communication, Network, and Satellite, COMNETSAT 2016 - Proceedings (pp. 7-13). [7907407] Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/COMNETSAT.2016.7907407