NDLI: Dead-Beat and LQ-optimal power control algorithms in the uplink of wireless systems

Content Provider	IEEE Xplore Digital Library
Author	Campos-Delgado, D.U. Luna-Rivera, J.M. Martinez-Lopez, F.J.
Copyright Year	2008
Description	Author affiliation: Fac. de Cienc., UASLP, San Luis Potosi (Campos-Delgado, D.U.; Luna-Rivera, J.M.)
Abstract	Power control is an important problem in today's wireless systems, which is related to the battery utilization in the mobile units. In this work, this problem is addressed using a distributed approach. The uplink of a direct-sequence code-division multiple-access communication (DS-CDMA) system is studied, and through a proper selection of the error function, the nonlinear coupling among the active users is transformed to individual loops, where the power references incorporate the information of the remaining users in the cell. It is concluded that the uplink channel variations do not destroy the stability of the feedback structures. However, the delays in the closed-loop paths can severely affect the stability and performance of the resulting feedback schemes. An LQ-optimal power control strategy is derived and compared to a dead-beat approach. In this sense, the dead-beat algorithm is sensitive to the roundtrip delays estimation, but the LQ-optimal control can be adjusted to be robust to this estimation error. However, there is a severe compromise between robustness and performance. But through an appropriate selection of the LQ weight parameter, an stable closed-loop system can be always guaranteed independently on the uncertainty in the estimation of the roundtrip delay. Simulation results are presented to compare the control algorithms using a standard single-step power correction approach.
Starting Page	4456
Ending Page	4461
File Size	364473
Page Count	6
File Format	PDF
ISBN	9781424420780
ISSN	07431619
DOI	10.1109/ACC.2008.4587197
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-06-11
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	American Automatic Control Council(AACC)
Subject Keyword	Power control Delay estimation Multiaccess communication Stability Feedback Batteries Mobile communication Couplings Robust control Estimation error
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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