Estimation of signal power/instantaneous energy requires nonlinear systems. A power estimator based on the Wiener model is proposed in this paper. Its input signal can be complex-valued, e.g., a baseband signal in a communications system, and its output is guaranteed to be positive. It is computationally very efficient as compared to quadratic filters, and allows for a predescribed prediction step required, for example, for application in delay sensitive closed control loops. Two methods of optimum/partial-optimum design are presented. The partially-optimized power estimator is simulated in COSSAP environment as a part of the power control loop of a CDMA mobile radio communication system. The system performance improvements are observed from bit error rate reductions.
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