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Accès multiple OFDMA pour les systèmes cellulaires post 3G : allocation de ressources et ordonnancement

Abstract : This thesis deals with radio resource allocation in WMAN (Wireless Metropolitan Area Networks) networks based on OFDMA (Orthogonal Frequency Division Multiple Access). Several applications for wireless networks demand high data rates. OFDMA is a multiple access technique based on OFDM (Orthogonal Frequency Division Multiplexing); it takes advantage of multiuser diversity and enables high data rates. In the first part of the thesis, resource allocation is considered at the physical layer (subcarrier and power allocation). In a single cell network, an algorithm is proposed to maximize the cell data rate while ensuring individual rates to users (Rate Adaptive optimization). Data rates obtained under subchannelization are compared to data rates obtained under individual subcarrier allocation. In a multicell network, a new algorithm using a dynamic frequency reuse factor is described. In a second part, scheduling is studied. The main goal is to provide delay guaranties to real time flows, maximize throughput of non real time flows while ensuring proportional fairness to the flows. GPS (Global Processor Sharing) extensions are examined. Two algorithms derived from the WFS (Wireless Fair Service) are defined. Performances are characterized and compared to existing algorithms in OFDMA. One of them, the OWFS (Opportunist Wireless Fair Service) algorithm is shown to maximize the data rate of non real time flows. Besides, thanks to the delay weight parameter, it is also possible to maintain a satisfying packet drop rate for real time flows.
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Submitted on : Friday, April 10, 2009 - 8:00:00 AM
Last modification on : Friday, July 31, 2020 - 10:44:05 AM


  • HAL Id : pastel-00003747, version 1



Carle Lengoumbi. Accès multiple OFDMA pour les systèmes cellulaires post 3G : allocation de ressources et ordonnancement. domain_other. Télécom ParisTech, 2008. English. ⟨pastel-00003747⟩



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