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Two-way DF relaying assisted D2D communication: ergodic rate and power allocation

Ni, Y; Wang, Y; Jin, S; Wong, K-K; Zhu, H; (2017) Two-way DF relaying assisted D2D communication: ergodic rate and power allocation. EURASIP Journal on Advances in Signal Processing , Article 40. 10.1186/s13634-017-0464-1. Green open access

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Abstract

In this paper, we investigate the ergodic rate for a device-to-device (D2D) communication system aided by a two-way decode-and-forward (DF) relay node. We first derive closed-form expressions for the ergodic rate of the D2D link under asymmetric and symmetric cases, respectively. We subsequently discuss two special scenarios including weak interference case and high signal-to-noise ratio case. Then we derive the tight approximations for each of the considered scenarios. Assuming that each transmitter only has access to its own statistical channel state information (CSI), we further derive closed-form power allocation strategy to improve the system performance according to the analytical results of the ergodic rate. Furthermore, some insights are provided for the power allocation strategy based on the analytical results. The strategies are easy to compute and require to know only the channel statistics. Numerical results show the accuracy of the analysis results under various conditions and test the availability of the power allocation strategy.

Type: Article
Title: Two-way DF relaying assisted D2D communication: ergodic rate and power allocation
Open access status: An open access version is available from UCL Discovery
DOI: 10.1186/s13634-017-0464-1
Publisher version: http://doi.org/10.1186/s13634-017-0464-1
Language: English
Additional information: Copyright © The Author(s). 2017 Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
Keywords: Device-to-device communication, Two-way relay, Decode-and-forward, Ergodic rate, Power allocation
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng
URI: https://discovery.ucl.ac.uk/id/eprint/1560922
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