Frequency staggered frequency shift keying modulation

Details Frequency staggered frequency shift keying modulation Frequency staggered frequency shift keying modulation

2005-04-06

2008-11-25

Liu, Shuwang (Department: 2611)

Pulse or digital communications

Systems using alternating or pulsating current

Angle modulation

C375S260000, C375S271000, C375S295000, C375S316000, C455S427000, C398S076000, C398S182000

Reexamination Certificate

active

07457370

ABSTRACT:
A frequency modulation method is proposed that enables an imprinting of a digital message formed by a sequence of symbols on a set of frequency bands. Each symbol of the digital message is hereby assigned just one symbol value out of a defined set of symbol values. According to the method at least two symbol transmission channels are defined with each symbol transmission channel being formed by a sub-set of frequency bands selected from the set of frequency bands and with each frequency band of a symbol transmission channel being allocated to a symbol value of the set of symbol values in a one-to-one relation such, that the symbol transmission channels defined differ from each other in at least one frequency band selected and/or in an allocation of a frequency band to a symbol value. Further, each of the defined symbol transmission channels is successively modulated with a single symbol value of the digital message according to the channel allocation scheme of the respective symbol transmission channel.

REFERENCES:
patent: 2003/0147655 (2003-08-01), Shattil
patent: 2003/0153308 (2003-08-01), Karabinis
patent: 2005/0018783 (2005-01-01), Nakache et al.
patent: 2005/0111346 (2005-05-01), Santhoff et al.
John G. Proakis: “Digital Communications” Jan. 1, 2001, Mc Graw Hill, New York, XP000864285.

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