Method, device, and radio for compensating for modulator frequen

Details Method, device, and radio for compensating for modulator frequen Method, device, and radio for compensating for modulator frequen

1994-12-09

1997-03-04

Chin, Stephen

Pulse or digital communications

Transmitters

Antinoise or distortion

332123, 455126, H04K 102, H04L 2503, H04L 2549

Patent

active

056087616

ABSTRACT:
A method (100), a device (300), and a radio (500) are described for compensating for modulator frequency drift while allowing for data transmission in a half-duplex frequency modulated communication system. An adjustment is made to a premodulation signal in such a way that when it is passed through a frequency modulator to provide a transmitter excitation signal, frequency drift is corrected. Subsequent to determining a training command, the transmitter excitation signal passes through a switch to a demodulator. The demodulator output is averaged and used in the adjustment.

REFERENCES:
patent: 4625331 (1986-11-01), Richardson et al.
patent: 5012208 (1991-04-01), Makinen et al.
patent: 5107520 (1992-04-01), Karam et al.
patent: 5130676 (1992-07-01), Mutz
patent: 5335365 (1994-08-01), Ballantyne et al.
patent: 5396196 (1995-03-01), Blodgett
Thomas G. Xydis, "A Novel,Wide Band, Crystal Controlled FM Transmitter", Info/Card 89, Feb. 1991.
Daniel E. Fague, "Open Loop Modulation of VCOs for Cordless Telecommunications", Info/Card 21, Jul. 1994.

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