Enhanced carrier frequency offset estimator

Details Enhanced carrier frequency offset estimator Enhanced carrier frequency offset estimator

2008-09-26

2011-10-25

Fan, Chieh M (Department: 2611)

Pulse or digital communications

Receivers

Automatic frequency control

C375S316000, C375S260000, C375S362000, C375S364000, C375S365000, C375S366000, C375S368000

Reexamination Certificate

active

08045657

ABSTRACT:
A method is provided for estimating a frequency offset in a carrier signal caused by the Doppler effect. The method determines a frequency offset estimate by utilizing a multi stage estimation scheme. More specifically, the method determines the frequency offset estimate of a data frame by iteratively estimating the frequency offset by comparing different portions of the preamble. As the length of the sampled patterns varies, the frequency offset estimates vary in accuracy and range. The method may adjust frequency offset estimates that are out of range. Finally, the receiver obtains a frequency offset estimate for the data frame from a weighted combination of frequency offset estimates. This method is applicable in WiFi (IEEE 802.11a/g), WiMax (IEEE 802.16), and WAVE (IEEE 802.11p) systems.

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