EURASIP Journal on Wireless Communications and Networking 
Volume 2006 (2006), Article ID 17526, 11 pages
doi:10.1155/WCN/2006/17526

Adaptive Downlink Resource Allocation Strategies for Real-Time Data Services in OFDM Cellular Systems

Navid Damji and Tho Le-Ngoc

 Department of ECE, McGill University, 3480 University street, Montréal, Québec, H3A 2A7, Canada
Received 1 October 2005; Revised 25 February 2006; Accepted 21 March 2006

Abstract

This paper presents a detailed performance analysis of adaptive downlink resource allocation based on users' instantaneous channel responses using power minimization (PM) and bandwidth constrained power minimization (BCPM) strategies. This study shows that, in cellular systems, where interference is a dominant factor, the link outage performance of a resource allocation strategy varies significantly depending on the user channel parameters. In particular, both analytical and simulation results indicate that the PM strategy outperforms BCPM in a mild shadowing environment. However, in severe shadowing conditions, this trend is reversed. This assessment holds true for both flat and frequency-selective fading.