Dependence of the mean SNR on the interaction between multiuser diversity, multipath diversity, and feedback delay

Research output: Chapter in Book/Report/Conference proceedingPaper in conference proceeding

Abstract

We examine wireless systems employing Rake receivers and fast scheduling over multiple users. The interactions between multipath diversity, multiuser diversity, and the feedback delay are investigated in terms of the mean signal-to-noise ratio (SNR). It is assumed that all users experience the same propagation characteristics, i.e., the same number of taps and power-delay profile (PDP). The results are exact as well as asymptotic (in the number of users) expressions that quantify this interaction. It is found that as the number of taps in the channel increases, the multiuser diversity gain decreases but better robustness against feedback delay is achieved. Furthermore, the asymptotic results derived show good agreement with the exact results for an exponential PDP, even for few users. Thus, we obtain expressions for the mean SNR that are compact and easy to evaluate

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Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Electrical Engineering, Electronic Engineering, Information Engineering

Keywords

  • power-delay profile, signal-to-noise ratio, Rake receivers, wireless systems, feedback delay, multiuser diversity, multipath diversity
Original languageEnglish
Title of host publication2005 IEEE 61st Vehicular Technology Conference. VTC2005- Spring
PublisherIEEE - Institute of Electrical and Electronics Engineers Inc.
Pages1898-1902
ISBN (Print)0-7803-8887-9
Publication statusPublished - 2005
Publication categoryResearch
Peer-reviewedYes
EventIEEE Vehicular Technology Conference -VTC Spring, 2005 : Paving the Path for a Wireless Future - Stockholm, Sweden
Duration: 2005 May 302005 Jun 1
Conference number: 61

Conference

ConferenceIEEE Vehicular Technology Conference -VTC Spring, 2005
CountrySweden
CityStockholm
Period2005/05/302005/06/01

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