Pre-compensated frequency modulation (PFM)

Details Pre-compensated frequency modulation (PFM) Pre-compensated frequency modulation (PFM)

1994-09-22

1996-11-26

Chin, Stephen

Pulse or digital communications

Transmitters

Antinoise or distortion

375271, 375285, 375286, 375302, 375322, 375331, 332124, 332125, 330149, 445 63, 371 378, H04K 102

Patent

active

055793428

ABSTRACT:
A system for transmitting FM signals comprised of apparatus for receiving an input data signal, apparatus for precompensating the received data signal, apparatus for applying the precompensated data signal to a constant envelope modulator to provide a modulated signal, apparatus for applying the modulated signal to a power efficient non-linear amplifier and transmitting a signal resulting therefrom, apparatus for receiving the transmitted signal in an I-Q receiver, and apparatus for filtering the received transmitted signal for the precompensation, to obtain an output data signal representative of the input data signal.

REFERENCES:
patent: 5068874 (1991-11-01), Leitch
patent: 5386202 (1995-01-01), Cochran et al.
A Comparison of Three QPSK Type Modulation Schemes for Mobile Satellite SCPC Voice and Data Services, Stewart N. Crozier, pp. 95-98--16th Biennial Symposium on Communications, Kingston, Ontario, Canada, May 27-29, 1992 Proceedings.

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