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The vast literature on power control for CDMA systems ignored the fact that propagation delays occur inevitably during data communication between the base station and the mobile units or vice-versa. If these delays are not considered into the power control design stage, the performance of the resulting feedback system can be severely deteriorated or even instability could be triggered in a practical scenario. In this paper, the authors extend the conventional power control framework to a more practical scenario that explicitly incorporate into the analysis: the propagation delays while information is exchanged between the base station and the mobile terminals, the asynchronous transmissions in the uplink channels, generally neglected in the literature for power control algorithms.
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