Spectrally efficient digital FM modulation system

Details Spectrally efficient digital FM modulation system Spectrally efficient digital FM modulation system

1989-08-07

1991-11-26

Safourek, Benedict V.

Pulse or digital communications

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Testing

375 58, 375101, 375 60, 332123, 332159, H03C 106

Patent

active

050688740

ABSTRACT:
A method is described for transmitting digital data with minimum splatter and for recovering the same with a conventional frequency modulated (FM) receiver to obtain data having minimum intersymbol interference. The method utilizes an optimized prototype pulse which has been predistorted to match the inverse characteristics of the post detection low pass filter in a conventional FM receiver. When the optimized electric pulse is received and processed by the post detection low pass filter of the conventional FM receiver, a pulse shape exhibiting minimal intersymbol interference is produced.

REFERENCES:
patent: 4123755 (1978-10-01), Fishbein et al.
patent: 4135057 (1979-01-01), Bayless, Sr. et al.
patent: 4412337 (1983-10-01), Bickley et al.
patent: 4435751 (1984-03-01), Hori et al.
patent: 4507794 (1985-03-01), Jones et al.
patent: 4694468 (1987-09-01), Cullum
patent: 4737969 (1988-04-01), Steel et al.
IEEE Communications, vol. 24, No. 4, Carl-Erik Sundberg "Continuous Phase Modulation", published Apr. 1986, pp. 25-38.

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