Open Access

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

EURASIP Journal on Wireless Communications and Networking20062006:079148

DOI: 10.1155/WCN/2006/79148

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

References

  1. Holma H, Toskala A (Eds): WCDMA for UMTS-Radio Access for Third Generation Mobile Communications. John Wiley & Sons, New York, NY, USA; 2000.Google Scholar
  2. 3GPP TR 25.858 V5.0.0 (2002–03) : High Speed Downlink Packet Access: Physical layer aspects, (Release 5).
  3. Sayadi B, Fijalkow I: Joint detection for multicode transmission in downlink high speed UMTS. Proceedings of 60th IEEE Vehicular Technology Conference (VTC '04), September 2004, Los Angeles, Calif, USA 2: 837–840.Google Scholar
  4. Saquib M, Yates RD, Ganti A: Power control for an asynchronous multirate decorrelator. IEEE Transactions on Communications 2000,48(5):804–812. 10.1109/26.843193View ArticleGoogle Scholar
  5. Yates RD: A framework for uplink power control in cellular radio systems. IEEE Journal on Selected Areas in Communications 1995,13(7):1341–1347. 10.1109/49.414651MathSciNetView ArticleGoogle Scholar
  6. Sampath A, Kumar PS, Holtzman JM: Power control and resource management for a multimedia CDMA wireless system. Proceedings of 6th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, Wireless: Merging onto the Information Superhighway (PIMRC '95), September 1995, Toronto, Ontario, Canada 1: 21–25.Google Scholar
  7. Veeravalli VV, Sendonaris A: The coverage-capacity tradeoff in cellular CDMA systems. IEEE Transactions on Vehicular Technology 1999,48(5):1443–1450. 10.1109/25.790518View ArticleGoogle Scholar
  8. Yun LC, Messerschmitt DG: Variable quality of service in CDMA systems by statistical power control. Proceedings of IEEE International Conference on Communications, Gateway to Globalization, June 1995, Seattle, Wash, USA 2: 713–719.Google Scholar
  9. Hanly SV, Tse D-N: Power control and capacity of spread spectrum wireless networks. Automatica 1999,35(12):1987–2012. 10.1016/S0005-1098(99)00133-8MathSciNetView ArticleMATHGoogle Scholar
  10. Foschini GJ, Miljanic Z: A simple distributed autonomous power control algorithm and its convergence. IEEE Transactions on Vehicular Technology 1993,42(4):641–646. 10.1109/25.260747View ArticleGoogle Scholar
  11. Ulukus S, Yates RD: Adaptive power control with MMSE multiuser detectors. Proceedings of IEEE International Conference on Communications, June 1997, Montreal, Quebec, Canada 1: 361–365.Google Scholar
  12. Andrews JG, Agrawal A, Meng TH, Cioffi JM: A simple iterative power control scheme for successive interference cancellation. Proceedings of 7th IEEE International Symposium on Spread Spectrum Techniques and Applications, September 2002, Prague, Czech Republic 3: 761–765.Google Scholar
  13. Meshkati F, Guo D, Poor HV, Schwartz SC, Mandayam NB: A unified approach to power control for multiuser detectors. In Proceedings of the 2nd International Workshop on Signal Processing for Wireless Communications, June 2004, London, UK. King's College;Google Scholar
  14. Meshkati F, Poor HV, Schwartz SC, Guo D: A unified power control algorithm for multiuser detectors in large systems: convergence and performance. Proceedings of the 43rd Allerton Conference on Communications, Control and Computing, September 2005, Urbana-Champaign, Ill, USAGoogle Scholar
  15. Guo D, Verdú S: Randomly spread CDMA: asymptotics via statistical physics. IEEE Transactions on Information Theory 2005,51(6):1983–2010. 10.1109/TIT.2005.847700View ArticleMathSciNetMATHGoogle Scholar
  16. Rashid-Farrokhi F, Ray Liu KJ, Tassiulas L: Downlink power control and base station assignment. IEEE Communications Letters 1997,1(4):102–104. 10.1109/4234.602597View ArticleGoogle Scholar
  17. Rashid-Farrokhi F, Tassiulas L, Ray Liu KJ: Joint optimal power control and beamforming in wireless networks using antenna arrays. IEEE Transactions on Communications 1998,46(10):1313–1324. 10.1109/26.725309View ArticleGoogle Scholar
  18. Lee J-W, Mazumdar RR, Shroff NB: Downlink power allocation for multi-class wireless systems. IEEE/ACM Transactions on Networking 2005,13(4):854–867.View ArticleGoogle Scholar
  19. Song L, Holtzman JM: CDMA dynamic downlink power control. Proceedings of 48th IEEE Vehicular Technology Conference (VTC '98), May 1998, Ottawa, Ontario, Canada 2: 1101–1105.Google Scholar
  20. 3GPP TS 25.215 V6.3.0 (2005–06) : Physical Layer - Measurements (FDD), (Release 6).
  21. Aguiar A, Gross J: Wireless channel models. In Tech. Rep. TKN-03–007. Telecommunications Networks Group, Technische Universität Berlin, Berlin, Germany; April 2003.Google Scholar
  22. Wang C-L, Li M-H, Wu K-M, Hwang K-L: Adaptive interference suppression with power control for CDMA systems. Proceedings of IEEE International Symposium on Circuits and Systems (ISCAS '01), May 2001, Sydney, NSW, Australia 4: 286–289.Google Scholar
  23. Luo J, Ulukus S, Ephremides A: Probability one convergence in joint stochastic power control and blind MMSE interference suppression. In Proceedings of 37th Conference on Information Sciences and Systems, March 2003, Baltimore, Md, USA. The Johns Hopkins University;Google Scholar

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.