A passivity approach to game-theoretic CDMA power control

X. Fan, T. Alpcan, M. Arcak, T. J. Wen, T. Başar

Research output: Contribution to journalArticlepeer-review

Abstract

This paper follows a game-theoretical formulation of the CDMA power control problem and develops new decentralized control algorithms that globally stabilize the desired Nash equilibrium. The novel approach is to exploit the passivity properties of the feedback loop comprising the mobiles and the base station. We first reveal an inherent passivity property in an existing gradient-type algorithm, and prove stability from the Passivity Theorem. We then exploit this passivity property to develop two new designs. In the first design, we extend the base station algorithm with Zames-Falb multipliers which preserve its passivity properties. In the second design, we broaden the mobile power update laws with more general, dynamic, passive controllers. These new designs may be exploited to enhance robustness and performance, as illustrated with a realistic simulation study. We then proceed to show robustness of these algorithms against time-varying channel gains.

Original languageEnglish (US)
Pages (from-to)1837-1847
Number of pages11
JournalAutomatica
Volume42
Issue number11
DOIs
StatePublished - Nov 2006

Keywords

  • CDMA power control
  • Game theory
  • Nonlinear control
  • Passivity

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Electrical and Electronic Engineering

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