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Abstract

A method for power estimation in DS-CDMA schemes employing non-coherent detection is disclosed. By buffering channel complex amplitudes and, subsequent to non-coherent detection of a received symbol, coherently averaging the complex amplitudes retrieved, an accurate power estimate is achieved. By further estimating the Doppler frequency in an alternate embodiment, an even better estimate can be achieved. The amplitude of the channel can be regarded as constant over a longer time period than merely one symbol and the coherent averaging generates more accurate power estimates than that achieved by non-coherent averaging. By estimating the Doppler frequency and only averaging coherently over a period no longer than the coherence time an even better estimate is achieved. The variance of the estimates is decreased and the effect of biasing is increasingly limited.

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