Impact of varying channel model mixtures on radio resource management for the OFDMA downlink

Sivridis, Leonidas, Wang, Xinheng and Choi, Jinho 2011, Impact of varying channel model mixtures on radio resource management for the OFDMA downlink, International Journal of Communication Networks and Information Security, vol. 3, no. 2, pp. 186-192.

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Title Impact of varying channel model mixtures on radio resource management for the OFDMA downlink
Author(s) Sivridis, Leonidas
Wang, Xinheng
Choi, JinhoORCID iD for Choi, Jinho orcid.org/0000-0002-4895-6680
Journal name International Journal of Communication Networks and Information Security
Volume number 3
Issue number 2
Start page 186
End page 192
Total pages 7
Publisher Kohat University of Science and Technology, Institute of Information Technology
Place of publication Kohat, Pakistan
Publication date 2011-10-07
ISSN 2076-0930
2073-607X
Keyword(s) OFDMA
CSI
power delay profile
radio resource management
Summary Adaptive resource allocation can drastically increase the throughput of an Orthogonal Frequency Division Multiple Access (OFDMA) system when the Channel State Information (CSI) is accurately known. Unfortunately, in practice, perfect CSI is rarely possible. In this paper, we study the efficiency of the OFDMA downlink for different vehicular user densities. In order to do so we assume that the transmitter knows the instantaneous CSI (ICSI) of the pedestrian users but only the statistical CSI (SCSI) of the users that exhibit high mobility (vehicular). We then address the problem of maximizing the sum-capacity of the system subject to user minimum Quality of Service (QoS) requirements. It is shown that when only the user SCSI is known loading channels with a rate equal to the Lambert W function of the average SNR leads to optimal channel utilization and important system throughput gains. Moreover, the impact of different channel models on the system throughput is investigated. The results show that the vehicular users can highly benefit from adaptive resource allocation under the assumption that their CSI is known by the transmitter.
Language eng
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2011, The Authors
Persistent URL http://hdl.handle.net/10536/DRO/DU:30115887

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