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Robust $H_{\infty}$ Power Control for CDMA Systems in User-Centric and Network-Centric Manners

  • Zhao, Nan (School of Electronics and Information Technology, Harbin Institute of Technology) ;
  • Wu, Zhilu (School of Electronics and Information Technology, Harbin Institute of Technology) ;
  • Zhao, Yaqin (School of Electronics and Information Technology, Harbin Institute of Technology) ;
  • Quan, Taifan (School of Electronics and Information Technology, Harbin Institute of Technology)
  • Received : 2009.02.21
  • Accepted : 2009.06.02
  • Published : 2009.08.30
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Abstract

In this paper, we present a robust $H_{\infty}$ distributed power control scheme for wireless CDMA communication systems. The proposed scheme is obtained by optimizing an objective function consisting of the user's performance degradation and the network interference, and it enables a user to address various user-centric and network-centric objectives by updating power in either a greedy or energy efficient manner. The control law is fully distributed in the sense that only its own channel variation needs to be estimated for each user. The proposed scheme is robust to channel fading due to the immediate decision of the power allocation of the next time step based on the estimations from the $H_{\infty}$ filter. Simulation results demonstrate the robustness of the scheme to the uncertainties of the channel and the excellent performance and versatility of the scheme with users adapting transmit power either in a user-centric or a network-centric efficient manner.

Keywords

References

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