A selective cluster index scheduling method in OFDMA

M Nicolaou, A Doufexi, SMD Armour

Research output: Chapter in Book/Report/Conference proceedingConference Contribution (Conference Proceeding)

3 Citations (Scopus)
458 Downloads (Pure)


Abstract—OFDM is an attractive solution for the design of future wireless communications due to its robustness to dispersion in multipath environments. Additional diversity gains can be realised by OFDMA by exploiting not only the temporal fading, but also spectral fading, that can result in higher rates due to increased diversity. A scheduler exploiting multiuser diversity imposes strict feedback requirements as channel quality information is required for every user’s feedback unit with a feedback rate at least equal to the coherence time of the channel. The instantaneous signal to noise ratio is the most commonly used metric to quantify users’ channel conditions. In OFDMA, the overhead due to feedback transmission increases significantly due to the fact that signal to noise ratio is required in the frequency domain, for every subcarrier of the OFDM symbol, which can potentially mitigate any multiuser diversity gains. This paper proposes a reduced feedback OFDMA design that requires very limited feedback information on a clustered subcarrier basis, whilst maintaining high downlink rates via Opportunistic Beamforming with multiple weighting vector transmission from the Base Station. This scheme is shown to be quite robust, as it can be easily adapted to variable channel conditions without any significant increase in complexity
Translated title of the contributionA selective cluster index scheduling method in OFDMA
Original languageEnglish
Title of host publicationIEEE 68th Vehicular Technology Conference (VTC Fall 2008), Calgary
PublisherInstitute of Electrical and Electronics Engineers (IEEE)
Pages1 - 5
Number of pages5
ISBN (Print)9781424417216
Publication statusPublished - Sep 2008
Event68th Vehicular Technology Conference 2008 (VTC 2008-Fall) - Calgary, Canada
Duration: 1 Sep 2008 → …

Publication series

ISSN (Print)10903038


Conference68th Vehicular Technology Conference 2008 (VTC 2008-Fall)
Period1/09/08 → …

Bibliographical note

Rose publication type: Conference contribution

Additional information: With accompanying conference poster

Sponsorship: The authors wish to acknowledge the financial support of Toshiba Research Europe Limited (TREL) and EPSRC and to thank Dr. Yong Sun of TREL for his technical input

Terms of use: Copyright © 2008 IEEE. Reprinted from IEEE Vehicular Technology Conference Fall 2008.

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