Method of determining parameters of an OFDM signal and...

Details Method of determining parameters of an OFDM signal and... Method of determining parameters of an OFDM signal and...

2007-01-30

2007-01-30

Tran, Khai (Department: 2611)

Pulse or digital communications

Systems using alternating or pulsating current

Plural channels for transmission of a single pulse train

C370S208000, C370S516000, C725S111000

Reexamination Certificate

active

10332691

ABSTRACT:
The invention relates to a method of determining parameters of a signal of OFDM type in a receiver comprising a tuner and a demodulator, as well as such a receiver.The method comprises the steps:(a) programming the demodulator with a particular value of the FFT mode parameter;(b) for this particular value of FFT mode parameter and a particular value of the guard interval, exhaustive variation of other parameters of the signal;(c) verification of the absence of lock-on, even temporary, of the carrier recovery loop during the phase of variation;(d) in case of absence of lock-on, repetition of the previous steps with another FFT mode;(e) storage of the configurations of parameters corresponding to temporary lock-ons; and(f) variation of the guard interval value for each of these configurations, until permanent lock-on of the carrier recovery loop is detected.

REFERENCES:
patent: 6091932 (2000-07-01), Langlais
patent: 6172993 (2001-01-01), Kim et al.
patent: 6449245 (2002-09-01), Ikeda et al.
patent: 0786889 (1997-07-01), None
patent: 0790722 (1997-08-01), None
patent: 0822715 (1998-02-01), None
P.J. Tourtier et al “Multicarrier Modem for Digital HDTV Terrestrial Broadcasting” Signal Processing. Image Communication, NL, vol. 5, No. 5/06, Dec. 1, 1993, pp. 379-403.

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