User-Antenna Selection for Physical-Layer Network Coding Based on Euclidean Distance

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Title: User-Antenna Selection for Physical-Layer Network Coding Based on Euclidean Distance
Authors: Kumar, VaibhavCardiff, BarryFlanagan, Mark F.
Permanent link: http://hdl.handle.net/10197/11111
Date: May-2019
Online since: 2019-10-07T12:21:46Z
Abstract: In this paper, we present the error performance analysis of a multiple-input multiple-output (MIMO) physical-layer network coding (PNC) system with two different user-antenna selection (AS) schemes in asymmetric channel conditions. For the first antenna selection scheme (AS1), where the user antenna is selected in order to maximize the overall channel gain between the user and the relay, we give an explicit analytical proof that for binary modulations, the system achieves full diversity order of min(N A , N B ) × N R in the multiple-access (MA) phase, where N A , N B , and N R denote the number of antennas at user A, user B, and relay R, respectively. We present a detailed investigation of the diversity order for the MIMO-PNC system with AS1 in the MA phase for any modulation order. A tight closed-form upper bound on the average SER is also derived for the special case when N R = 1, which is valid for any modulation order. We show that in this case, the system fails to achieve transmit diversity in the MA phase, as the system diversity order drops to 1 irrespective of the number of transmit antennas at the user nodes. Additionally, we propose a Euclidean distance (ED) based user-antenna selection scheme (AS2) that outperforms the first scheme in terms of error performance. Moreover, by deriving upper and lower bounds on the diversity order for the MIMO-PNC system with AS2, we show that this system enjoys both transmit and receive diversity, achieving full diversity order of min(N A , N B ) × N R in the MA phase for any modulation order. Monte Carlo simulations are provided which confirm the correctness of the derived analytical results.
Funding Details: European Commission - European Regional Development Fund
Science Foundation Ireland
Type of material: Journal Article
Publisher: IEEE
Journal: IEEE Transactions on Communications
Volume: 67
Issue: 5
Start page: 3363
End page: 3375
Copyright (published version): 2019 IEEE
Keywords: Physical-layer network codingWireless two-way relayingMIMOAntenna selectionEuclidean distance
DOI: 10.1109/TCOMM.2019.2893642
Language: en
Status of Item: Peer reviewed
Appears in Collections:Electrical and Electronic Engineering Research Collection

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