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Phase-rotation-aided relay selection in two-way decode-and-forward relay networks

Phase-rotation-aided relay selection in two-way decode-and-forward relay networks
Phase-rotation-aided relay selection in two-way decode-and-forward relay networks
This paper proposes a relay selection scheme that aims to improve the end-to-end symbol error rate (SER) performance of a two-way relay network (TWRN). The TWRN consists of two single-antenna sources and multiple relays employing decode-and-forward (DF) protocol. It is shown that the SER performance is determined by the minimum decision distance (DD) observed in the TWRN. However, the minimum DD is likely to be made arbitrarily small by channel fading. To tackle this problem, a phase rotation (PR) aided relay selection (RS) scheme is proposed to enlarge the minium DD, which in turn improves the SER performance. The proposed PR based scheme rotates the phases of the transmitted symbols of one source and of the selected relay according to the channel state information, aiming for increasing all DDs to be above a desired bound. The lower bound is further optimized by using a MaxMin-RS criterion associated with the channel gains. It is demonstrated that the PR aided MaxMin-RS approach achieves full diversity gain and an improved array gain. Furthermore, compared with the existing DF based schemes, the proposed scheme allows more flexible relay antenna configurations.
decode-and-forward, beamforming, relay selection, network coding, MIMO, full diversity.
0018-9545
2922-2935
Cao, Ruohan
5a033409-9b40-44ac-ad1d-b3261983119b
Gao, Hui
d1b095e6-df29-4eb6-b7fb-efa6baf8e162
Lv, Tiejun
fb465673-1068-4cae-bb94-93ab1dd63f4d
Yang, Shaoshi
df1e6c38-ff3b-473e-b36b-4820db908e60
Huang, Shanguo
1a1cc231-e057-46ed-aa14-1bd79be5217b
Cao, Ruohan
5a033409-9b40-44ac-ad1d-b3261983119b
Gao, Hui
d1b095e6-df29-4eb6-b7fb-efa6baf8e162
Lv, Tiejun
fb465673-1068-4cae-bb94-93ab1dd63f4d
Yang, Shaoshi
df1e6c38-ff3b-473e-b36b-4820db908e60
Huang, Shanguo
1a1cc231-e057-46ed-aa14-1bd79be5217b

Cao, Ruohan, Gao, Hui, Lv, Tiejun, Yang, Shaoshi and Huang, Shanguo (2016) Phase-rotation-aided relay selection in two-way decode-and-forward relay networks. IEEE Transactions on Vehicular Technology, 65 (5), 2922-2935. (doi:10.1109/TVT.2015.2442622).

Record type: Article

Abstract

This paper proposes a relay selection scheme that aims to improve the end-to-end symbol error rate (SER) performance of a two-way relay network (TWRN). The TWRN consists of two single-antenna sources and multiple relays employing decode-and-forward (DF) protocol. It is shown that the SER performance is determined by the minimum decision distance (DD) observed in the TWRN. However, the minimum DD is likely to be made arbitrarily small by channel fading. To tackle this problem, a phase rotation (PR) aided relay selection (RS) scheme is proposed to enlarge the minium DD, which in turn improves the SER performance. The proposed PR based scheme rotates the phases of the transmitted symbols of one source and of the selected relay according to the channel state information, aiming for increasing all DDs to be above a desired bound. The lower bound is further optimized by using a MaxMin-RS criterion associated with the channel gains. It is demonstrated that the PR aided MaxMin-RS approach achieves full diversity gain and an improved array gain. Furthermore, compared with the existing DF based schemes, the proposed scheme allows more flexible relay antenna configurations.

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More information

Accepted/In Press date: 30 May 2015
Published date: May 2016
Keywords: decode-and-forward, beamforming, relay selection, network coding, MIMO, full diversity.
Organisations: Southampton Wireless Group

Identifiers

Local EPrints ID: 365441
URI: https://eprints.soton.ac.uk/id/eprint/365441
ISSN: 0018-9545
PURE UUID: 300e2922-d85b-40fa-9acb-42525d756c5b

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Date deposited: 04 Jun 2014 13:52
Last modified: 06 Aug 2019 18:46

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Contributors

Author: Ruohan Cao
Author: Hui Gao
Author: Tiejun Lv
Author: Shaoshi Yang
Author: Shanguo Huang

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