Method and apparatus for eliminating frequency mismatch between

Details Method and apparatus for eliminating frequency mismatch between Method and apparatus for eliminating frequency mismatch between

1996-03-05

1998-09-08

Eisenzopf, Reinhard J.

Telecommunications

Transmitter and receiver at separate stations

With control signal

455 674, 4551922, 455255, 455264, 375344, H04B 726

Patent

active

058059849

ABSTRACT:
Frequency mismatch between the carrier oscillator (18) of a radio transmitter (10) and a local oscillator (44) of a radio receiver is eliminated. The transmitter generates a mismatch correction signal (54), modulates it with the carrier, and transmits to the receiver. The receiver demodulates the received signal and generates a pulse train (52) having a duty cycle indicative of the frequency deviation. A digital logic unit (42) calculates the magnitude and direction of the frequency deviation, and adjusts the local oscillator to match the carrier frequency.

REFERENCES:
patent: 5115515 (1992-05-01), Yamamoto et al.
patent: 5249305 (1993-09-01), Wieczorek et al.
patent: 5461645 (1995-10-01), Ishii
patent: 5488332 (1996-01-01), DeLoe

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