Open Access

Performance Analysis of SNR-Based Scheduling Policies in Asymmetric Broadcast Ergodic Fading Channel

  • Jesús Pérez1Email author,
  • Jesús Ibáñez1,
  • Javier Vía1 and
  • Ignacio Santamaría1
EURASIP Journal on Wireless Communications and Networking20092009:163826

DOI: 10.1155/2009/163826

Received: 1 July 2008

Accepted: 26 January 2009

Published: 18 February 2009

Abstract

We analyze the performance of SNR-based scheduling algorithms in broadcast ergodic fading channels where multiuser selection diversity is exploited. At each channel state, the user with the highest weighted signal-to-noise ratio is selected to be transmitted. The use of weights associated to the users allows us to control the degree of fairness among users and to arrange them according to a prescribed quality of service. These weights parametrize the scheduling algorithms so each set of weights corresponds to a specific scheduling algorithm. Assuming Rayleigh fading broadcast channel, we derive a closed-form expression for the achievable user's rates as a function of the scheduling algorithm, the channel fading statistics of each user, and the transmit power. With the help of this expression, we solve some interesting inverse problems. For example, for a given arbitrary channel statistics we obtain the optimum scheduling algorithm to achieve a prescribed set of users' rates with minimum transmit power.

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Authors’ Affiliations

(1)
Department of Communications Engineering, University of Cantabria

Copyright

© Jesús Pérez et al. 2009

This article is published under license to BioMed Central Ltd. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.