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On the Multiuser Diversity of Relay-Aided Downlink Systems Using Reduced Feedback

We introduce an efficient multiuser scheduling method using amplify-and-forward relaying in relay-aided downlink systems, consisting of one base station (BS), one relay station, and multiple mobile stations (MSs). In our scheme, the BS opportunistically selects both the transmission mode, that is, e...

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Detalles Bibliográficos
Autores principales: Jang, Yong-Up, Shin, Won-Yong
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Hindawi Publishing Corporation 2014
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4241708/
https://www.ncbi.nlm.nih.gov/pubmed/25436232
http://dx.doi.org/10.1155/2014/857540
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author Jang, Yong-Up
Shin, Won-Yong
author_facet Jang, Yong-Up
Shin, Won-Yong
author_sort Jang, Yong-Up
collection PubMed
description We introduce an efficient multiuser scheduling method using amplify-and-forward relaying in relay-aided downlink systems, consisting of one base station (BS), one relay station, and multiple mobile stations (MSs). In our scheme, the BS opportunistically selects both the transmission mode, that is, either one- or two-hop transmission, and the desired user (i.e., the desired MS). Closed-form expressions for the average achievable rates are derived for the two transmission modes with multiuser scheduling, and its asymptotic solutions are also analyzed in the limit of large number of MSs. Based on the analysis, we propose a feedback-efficient two-step multiuser scheduling algorithm: the transmission mode selection followed by the user selection that only needs a partial feedback for instantaneous signal-to-noise ratios (SNRs) to the BS. We also analyze the average SNR condition such that the multiuser diversity gain is fully exploited for two-hop transmission. The proposed two-step scheduling algorithm exhibits the quite comparable achievable rates to those of the optimal one using full feedback information, while its required feedback information is reduced by half of the optimal one.
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spelling pubmed-42417082014-11-30 On the Multiuser Diversity of Relay-Aided Downlink Systems Using Reduced Feedback Jang, Yong-Up Shin, Won-Yong ScientificWorldJournal Research Article We introduce an efficient multiuser scheduling method using amplify-and-forward relaying in relay-aided downlink systems, consisting of one base station (BS), one relay station, and multiple mobile stations (MSs). In our scheme, the BS opportunistically selects both the transmission mode, that is, either one- or two-hop transmission, and the desired user (i.e., the desired MS). Closed-form expressions for the average achievable rates are derived for the two transmission modes with multiuser scheduling, and its asymptotic solutions are also analyzed in the limit of large number of MSs. Based on the analysis, we propose a feedback-efficient two-step multiuser scheduling algorithm: the transmission mode selection followed by the user selection that only needs a partial feedback for instantaneous signal-to-noise ratios (SNRs) to the BS. We also analyze the average SNR condition such that the multiuser diversity gain is fully exploited for two-hop transmission. The proposed two-step scheduling algorithm exhibits the quite comparable achievable rates to those of the optimal one using full feedback information, while its required feedback information is reduced by half of the optimal one. Hindawi Publishing Corporation 2014 2014-11-10 /pmc/articles/PMC4241708/ /pubmed/25436232 http://dx.doi.org/10.1155/2014/857540 Text en Copyright © 2014 Y.-U. Jang and W.-Y. Shin. https://creativecommons.org/licenses/by/3.0/ This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
spellingShingle Research Article
Jang, Yong-Up
Shin, Won-Yong
On the Multiuser Diversity of Relay-Aided Downlink Systems Using Reduced Feedback
title On the Multiuser Diversity of Relay-Aided Downlink Systems Using Reduced Feedback
title_full On the Multiuser Diversity of Relay-Aided Downlink Systems Using Reduced Feedback
title_fullStr On the Multiuser Diversity of Relay-Aided Downlink Systems Using Reduced Feedback
title_full_unstemmed On the Multiuser Diversity of Relay-Aided Downlink Systems Using Reduced Feedback
title_short On the Multiuser Diversity of Relay-Aided Downlink Systems Using Reduced Feedback
title_sort on the multiuser diversity of relay-aided downlink systems using reduced feedback
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4241708/
https://www.ncbi.nlm.nih.gov/pubmed/25436232
http://dx.doi.org/10.1155/2014/857540
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