Weighted-SNR-based fair scheduling for uplink OFDMA

Handle URI:
http://hdl.handle.net/10754/564243
Title:
Weighted-SNR-based fair scheduling for uplink OFDMA
Authors:
Ma, Yao; Leith, Alex; Alouini, Mohamed-Slim ( 0000-0003-4827-1793 ) ; (Sherman) Shen X., Xuemin
Abstract:
In this paper, we study the sum rate maximization algorithms with long-term proportional rate fairness (PRF) for uplink orthogonal frequency division multiple access (OFDMA) systems. In contrast to the rate-maximization schemes which used short-term PRF in the literature, we propose to use a selective multiuser diversity (SMuD) scheme to achieve a long-term PRF and improved sum rate performance. This scheme implements weighted channel signal-to-noise ratio (w-SNR)-based ranking for user selection on each subchannel, and then uses either water-filling (WF) or equal power allocation (EPA) along the assigned channels of each user. Both offline and online methods to find the optimal SNR weight factors are designed to achieve the target proportional rates for different users. The offline optimization technique requires to know the channel distribution information (CDI) at the scheduler. The online method uses the weight adaption combined with individual user rate tracking, which avoids the need to know the CDI. Analytical throughput metrics for the proposed w-SNR scheme with WF and EPA over Rayleigh channels are derived, and verified by simulations. Simulation results show that the proposed w-SNR PRF scheme can achieve significantly higher sum rates than the frequency diversity-based short-term and long-term fairness schemes. Besides the improved performance, the proposed schemes have a low complexity which is linear to numbers of users and subchannels.
KAUST Department:
Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division; Electrical Engineering Program; Communication Theory Lab
Publisher:
Institute of Electrical and Electronics Engineers (IEEE)
Journal:
GLOBECOM 2009 - 2009 IEEE Global Telecommunications Conference
Conference/Event name:
2009 IEEE Global Telecommunications Conference, GLOBECOM 2009
Issue Date:
Nov-2009
DOI:
10.1109/GLOCOM.2009.5426227
Type:
Conference Paper
ISBN:
9781424441488
Appears in Collections:
Conference Papers; Electrical Engineering Program; Communication Theory Lab; Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division

Full metadata record

DC FieldValue Language
dc.contributor.authorMa, Yaoen
dc.contributor.authorLeith, Alexen
dc.contributor.authorAlouini, Mohamed-Slimen
dc.contributor.author(Sherman) Shen X., Xueminen
dc.date.accessioned2015-08-04T06:20:25Zen
dc.date.available2015-08-04T06:20:25Zen
dc.date.issued2009-11en
dc.identifier.isbn9781424441488en
dc.identifier.doi10.1109/GLOCOM.2009.5426227en
dc.identifier.urihttp://hdl.handle.net/10754/564243en
dc.description.abstractIn this paper, we study the sum rate maximization algorithms with long-term proportional rate fairness (PRF) for uplink orthogonal frequency division multiple access (OFDMA) systems. In contrast to the rate-maximization schemes which used short-term PRF in the literature, we propose to use a selective multiuser diversity (SMuD) scheme to achieve a long-term PRF and improved sum rate performance. This scheme implements weighted channel signal-to-noise ratio (w-SNR)-based ranking for user selection on each subchannel, and then uses either water-filling (WF) or equal power allocation (EPA) along the assigned channels of each user. Both offline and online methods to find the optimal SNR weight factors are designed to achieve the target proportional rates for different users. The offline optimization technique requires to know the channel distribution information (CDI) at the scheduler. The online method uses the weight adaption combined with individual user rate tracking, which avoids the need to know the CDI. Analytical throughput metrics for the proposed w-SNR scheme with WF and EPA over Rayleigh channels are derived, and verified by simulations. Simulation results show that the proposed w-SNR PRF scheme can achieve significantly higher sum rates than the frequency diversity-based short-term and long-term fairness schemes. Besides the improved performance, the proposed schemes have a low complexity which is linear to numbers of users and subchannels.en
dc.publisherInstitute of Electrical and Electronics Engineers (IEEE)en
dc.subjectMultiuser diversityen
dc.subjectOFDMAen
dc.subjectProportional rate fairness (PRF)en
dc.subjectThroughput maximizationen
dc.subjectWater-filling power allocationen
dc.titleWeighted-SNR-based fair scheduling for uplink OFDMAen
dc.typeConference Paperen
dc.contributor.departmentComputer, Electrical and Mathematical Sciences and Engineering (CEMSE) Divisionen
dc.contributor.departmentElectrical Engineering Programen
dc.contributor.departmentCommunication Theory Laben
dc.identifier.journalGLOBECOM 2009 - 2009 IEEE Global Telecommunications Conferenceen
dc.conference.date30 November 2009 through 4 December 2009en
dc.conference.name2009 IEEE Global Telecommunications Conference, GLOBECOM 2009en
dc.conference.locationHonolulu, HIen
dc.contributor.institutionDepartment of Electrical and Computer Engineering, Iowa State University, Ames, IA 50011, United Statesen
dc.contributor.institutionDepartment of Electrical and Computer Engineering, University of Waterloo, Waterloo, ON N2L 3G1, Canadaen
kaust.authorAlouini, Mohamed-Slimen
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