Method and system for synchoronizing a receiver in an OFDM...

Pulse or digital communications – Systems using alternating or pulsating current – Plural channels for transmission of a single pulse train

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C375S326000, C375S325000, C375S354000, C375S231000

Reexamination Certificate

active

07873111

ABSTRACT:
Method and system for synchronizing a receiver in an Orthogonal Frequency Division Multiplexing (OFDM) system. The method comprises transforming (105) a received signal from the time domain into the frequency domain to produce a transformed signal. The method further comprises rotating (110) each set of ranging tones of the transformed signal in the frequency domain based on a corresponding tone index to produce a set of phase-rotated frequency domain received ranging tones that is equivalent to time domain shifted ranging signals. Each ranging tone is rotated iteratively over a predefined set of delay-values and each delay-value within the predefined set of delay-values ranges from zero to a predetermined time delay. Also, the method comprises computing (115) a detection metric corresponding to each delay-value within the predefined set of delay-values based on the set of phase-rotated frequency domain received ranging tones.

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patent: 6891792 (2005-05-01), Cimini, Jr. et al.
patent: 6959050 (2005-10-01), Baum et al.
patent: 7251283 (2007-07-01), Chen
patent: 2002/0176354 (2002-11-01), Chiodini
patent: 2006/0239179 (2006-10-01), Berkeman et al.
patent: 2007/0036233 (2007-02-01), Yu et al.
patent: 2008/0219340 (2008-09-01), Saed

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