A Practical Feasibility Study of a Novel Strategy for the Gaussian Half-Duplex Relay Channel

Robin Rajan Thomas, Martina Cardone, Raymond Knopp, Daniela Tuninetti, Bodhaswar T. Maharaj

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

This paper presents a practical feasibility study of a novel two-phase three-part-message strategy for half-duplex relaying, which features superposition coding and interference-aware cancellation decoding. Aiming to analyze the performance of the proposed scheme in the non-asymptotic regime, this paper evaluates the spectral efficiency with finite block-length and discrete constellation signaling and compares it with the theoretical performance of Gaussian codes with asymptotically large block-lengths. The performance evaluation is carried out on an LTE simulation test bench. During each transmission phase, the modulation and coding scheme is adapted to the channel link qualities to enhance the overall spectral efficiency. A single-antenna source and relay, and a multi-antenna destination are assumed. The static Gaussian and two frequency selective channel models are considered for the proposed scheme. A spectral efficiency comparison with a baseline scheme (non-cooperative two-hop transmission, i.e., the source-destination link is absent) and with the point-to-point transmission strategy (no relay) is presented. The results confirm that physical-layer cooperation and multi-antennas are critical for performance enhancement in heterogeneous networks. Moreover, they show that physical layer cooperation advantages are within practical reach with existing LTE coded-modulation and interference-mitigation techniques, which are prevalent in modern user-equipment.

Original languageEnglish (US)
Article number7604137
Pages (from-to)101-116
Number of pages16
JournalIEEE Transactions on Wireless Communications
Volume16
Issue number1
DOIs
StatePublished - Jan 2017

Bibliographical note

Publisher Copyright:
© 2002-2012 IEEE.

Keywords

  • Decode-and-forward
  • Successive interference cancellation
  • half-duplex relay
  • physical-layer cooperation
  • spectral efficiency

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