Pulse or digital communications – Systems using alternating or pulsating current – Plural channels for transmission of a single pulse train
Reexamination Certificate
2005-06-29
2009-10-27
Tran, Khanh C (Department: 2611)
Pulse or digital communications
Systems using alternating or pulsating current
Plural channels for transmission of a single pulse train
C375S343000
Reexamination Certificate
active
07609773
ABSTRACT:
In one embodiment, the invention comprises a channel estimation method, comprising determining a FFT window position, and calculating a delay spread. In another embodiment, the step of determining a FFT window position comprises setting an initial position of the FFT window, computing an energy for each tap, time averaging said energy for each tap, comparing an average energy of each tap with a first threshold multiplied by the average energy of all taps, comparing the average energy of each tap with a second threshold multiplied by a maximum average energy in alias components, updating the set of paths if the average energy of the tap is greater than said second threshold multiplied by the maximum average energy in alias components; and refining the FFT window position.
REFERENCES:
patent: 6993083 (2006-01-01), Shirakata et al.
patent: 7233625 (2007-06-01), Ma et al.
patent: 2005/0036564 (2005-02-01), Peter et al.
patent: 2005/0063298 (2005-03-01), Ling et al.
patent: 2006/0018413 (2006-01-01), Gupta
patent: 2006/0165197 (2006-07-01), Morita et al.
patent: 20020011096 (2002-07-01), None
patent: 20040032987 (2004-04-01), None
patent: WO 2005/022797 (2005-03-01), None
Chen N. et al.: “OFDM timing Synchronisation Under Multi-path Channels”, IEEE Vehicular Technology Conference, New York, NY: IEEE US, vol. 4 of 4. Conf. 57, Apr. 22, 2003, pp. 378-382.
International Search Report (4 pages).
Written Opinion - PCT/US06/014041 - International Search Authority, European Patent Office - Aug. 22, 2006.
International Preliminary Report on Patentability - PCT/US06/014041 - The International Bureau of WIPO, Geneva, Switzerland - Oct. 23, 2007.
Bhushan Naga
Black Peter J.
Namgoong June
Jacobs Jeffrey D.
Moxkowitz Larry J.
QUALCOMM Incorporated
Tran Khanh C
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