Enhanced frequency agile radio

Details Enhanced frequency agile radio Enhanced frequency agile radio

1997-09-16

2000-02-29

Pham, Chi H.

Pulse or digital communications

Receivers

Automatic frequency control

455 674, 331 4, H04L 2706, H01J 906, H03L 700

Patent

active

06031883&

ABSTRACT:
A method utilizing intentionally generated in-band frequency harmonics to compensate for frequency error and frequency drift in a voltage controlled oscillator of a receiver, thereby eliminating the frequency synthesizer and RF divider required in conventional designs. The method includes modulating the intentionally generated frequency in a predetermined manner so that a receiver can identify the intentionally generated frequency and includes the use of plural frequency harmonics for use in a curve fitting technique to correct frequency error in the voltage controlled oscillator.

REFERENCES:
patent: 3611152 (1971-10-01), Sakai
patent: 3904980 (1975-09-01), Hugenholtz
patent: 4001714 (1977-01-01), Reed
patent: 4262264 (1981-04-01), Vandegraff
patent: 4550312 (1985-10-01), Galloway et al.
patent: 4881273 (1989-11-01), Koyama et al.
patent: 5115515 (1992-05-01), Yamamoto et al.
patent: 5146616 (1992-09-01), Tang et al.
patent: 5548811 (1996-08-01), Kumagai et al.

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