Time domain based approach for fast fading channel FFT...

Details Time domain based approach for fast fading channel FFT... Time domain based approach for fast fading channel FFT...

2008-04-23

2011-10-11

Ahn, Sam K (Department: 2611)

Pulse or digital communications

Systems using alternating or pulsating current

Plural channels for transmission of a single pulse train

Reexamination Certificate

active

08036291

ABSTRACT:
A method of fast fading channel Fast Fourier Transform (FFT) trigger point tracking in an integrated services digital broadcasting (ISDB) receiver includes inputting a signal in a fading channel including N Orthogonal Frequency Division Multiplexing (OFDM) symbols, determining an average correlation result of a current time-domain sample of the signal and a previous time-domain sample taken previously of the signal, accumulating the average correlation result for at least one of the OFDM symbols, determining a peak of the average correlation result to obtain a peak position, and identifying the peak position as a trigger point of the input signal. The peak position may be compared with a first trigger point to generate a trigger point error signal. The first trigger point may be set at the middle of a guard of an OFDM symbol to generate the trigger point error signal.

REFERENCES:
patent: 7693129 (2010-04-01), Kishore et al.
patent: 2007/0092044 (2007-04-01), Wang et al.

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