Method and apparatus for coherently-averaged power estimation

Details Method and apparatus for coherently-averaged power estimation Method and apparatus for coherently-averaged power estimation

1997-12-04

2000-05-23

Chin, Stephen

Pulse or digital communications

Repeaters

Testing

375200, 375335, 375344, 370209, 370335, 370342, H04B 1500, H04K 100, H04L 2730

Patent

active

06067315&

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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