Apparatus and method for estimating carrier frequency offset for multipath signals
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United States of America Patent
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Mar 20, 2018
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app pub date -
Jan 9, 2017
filing date -
Jan 12, 2016
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Abstract
An apparatus for estimating carrier frequency offset for multipath signals includes an echo signal filtering circuit, an Mth power circuit, a spectrum generating circuit, a peak frequency determining circuit and a frequency offset determining circuit. The echo signal filtering circuit filters out an echo signal from an input signal to generate a filtered signal. The Mth power circuit performs an Mth power calculation on the filtered signal to generate an Mth power calculation result. The spectrum generating circuit generates an Mth power spectrum according to the Mth power calculation result. The peak frequency determining circuit determines a peak frequency corresponding to an amplitude peak from the Mth power spectrum. The frequency offset determining circuit determines an estimated carrier frequency offset according to the peak frequency.
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