Modulators – Frequency shift keying modulator or minimum shift keying...
Patent
1998-12-10
2000-04-18
Mis, David
Modulators
Frequency shift keying modulator or minimum shift keying...
332103, 332107, 375223, 375296, H03C 300, H03K 700, H04L 2700
Patent
active
06052037&
ABSTRACT:
Disclosed is a modulation method in which the frequency band of a transmission signal, consisting of signal points generated at a given modulation rate in accordance with transmission data, is shifted by a desired frequency shift amount, and which is capable of lowering carrier frequency without increasing the amount of computation. The modulation method includes the steps of (a) shifting the frequency band of the transmission signal by a first frequency shift amount, (b) low-pass filtering an output signal resulting from the step (a) in order to limit the output signal to a frequency band containing baseband and equivalent to an integral multiple of the modulation rate, and (c) shifting the frequency band of an output signal resulting from the step (b) by a second frequency shift amount equivalent to an integral submultiple of a sampling frequency, wherein the first frequency shift amount is set so that the sum of the first frequency shift amount and the second frequency shift amount is equal to the desired frequency shift amount.
REFERENCES:
patent: 4672633 (1987-06-01), Claasen et al.
patent: 5783974 (1998-07-01), Koslov et al.
patent: 5815046 (1998-09-01), Spilker, Jr. et al.
patent: 5930301 (1999-07-01), Chester et al.
Kaku Takashi
Miyazawa Hideo
Fujitsu Limited
Mis David
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