Relay X channels without channel state information at the transmit sides: Degrees of freedom

Hamideh Zebardast, Ali Tajer, Behrouz Maham, Mohsen Rezaee

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Citations (Scopus)

Abstract

This paper focuses on the two-user relay-assisted X channel with no channel state information (CSI) available at the transmitter side. Two relaying modes, namely half-duplex decode-and-forward (DF) and cognitive relays, are considered and the degrees of freedom (DoF) are characterized. It is shown that assisted by a half-duplex DF relay that is equipped with 2M antennas, the X channel with two M-antenna users has 4M/3 DoF, which is achievable through interference alignment (IA). Furthermore, it is shown that in this channel, an M-antenna cognitive relay (with non-causal access to information streams) provides 2M DoF using interference cancellation (IC) technique. In this setting, IC outperforms interference alignment in the cognitive relay mode, since the latter achieves 4M/3 DoF.

Original languageEnglish
Title of host publication2015 IEEE Wireless Communications and Networking Conference, WCNC 2015
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages493-497
Number of pages5
ISBN (Electronic)9781479984060
DOIs
Publication statusPublished - Jun 17 2015
Event2015 IEEE Wireless Communications and Networking Conference, WCNC 2015 - New Orleans, United States
Duration: Mar 9 2015Mar 12 2015

Publication series

Name2015 IEEE Wireless Communications and Networking Conference, WCNC 2015

Other

Other2015 IEEE Wireless Communications and Networking Conference, WCNC 2015
CountryUnited States
CityNew Orleans
Period3/9/153/12/15

Keywords

  • cognitive relay
  • decode-and-forward relay
  • degrees of freedom
  • relay X channel

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Computer Networks and Communications
  • Computer Science Applications
  • Signal Processing

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  • Cite this

    Zebardast, H., Tajer, A., Maham, B., & Rezaee, M. (2015). Relay X channels without channel state information at the transmit sides: Degrees of freedom. In 2015 IEEE Wireless Communications and Networking Conference, WCNC 2015 (pp. 493-497). [7127519] (2015 IEEE Wireless Communications and Networking Conference, WCNC 2015). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/WCNC.2015.7127519