EURASIP Journal on Wireless Communications and Networking

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Research Article
Open Access

Joint Downlink Power Control and Multicode Receivers for Downlink Transmissions in High Speed UMTS

EURASIP Journal on Wireless Communications and Networking20062006:079148

https://doi.org/10.1155/WCN/2006/79148

©  Bessem Sayadi et al. 2006

Received: 30 September 2005

Accepted: 19 May 2006

Published: 6 August 2006

Abstract

We propose to combine the gains of a downlink power control and a joint multicode detection, for an HSDPA link. We propose an iterative algorithm that controls both the transmitted code powers and the joint multicode receiver filter coefficients for the high-speed multicode user. At each iteration, the receiver filter coefficients of the multicode user are first updated (in order to reduce the intercode interferences) and then the transmitted code powers are updated, too. In this way, each spreading code of the multicode scheme creates the minimum possible interference to others while satisfying the quality of service requirement. The main goals of the proposed algorithm are on one hand to decrease intercode interference and on the other hand to increase the system capacity. Analysis for the rake receiver, joint multicode zero forcing (ZF) receiver, and joint multicode MMSE receiver is presented. Simulation is used to show the convergence of the proposed algorithm to a fixed point power vector where the multicode user satisfies its signal-to-interference ratio (SIR) target on each code. The results show the convergence behavior for the different receivers as the number of codes increases. A significant gain in transmitted base station power is obtained.

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Authors’ Affiliations

(1)
ETIS/ENSEA, University of Clergy-Pontoise/CNRS

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Copyright

© Bessem Sayadi et al. 2006

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.