Digital radio communication system having reduced phase-locked l

Details Digital radio communication system having reduced phase-locked l Digital radio communication system having reduced phase-locked l

1996-12-30

2000-02-01

Pham, Chi H.

Pulse or digital communications

Receivers

Automatic frequency control

375327, 375376, 455 75, H04L 2706

Patent

active

060211644

ABSTRACT:
A digital radio communication system includes a first down converter for converting down a predetermined radio frequency (RF) signal into a first intermediate frequency (IF) signal according to a first local oscillation signal; a second down converter for converting down the first IF signal into a second IF signal according to a second local oscillation signal; a demodulator for demodulating the second IF signal according to a third local oscillation signal and outputting a predetermined base band of a signal; a modulator for modulating the predetermined base band of signal according to the second local oscillation signal and outputting a third IF signal; a up converter for converting the third IF signal to a RF signal according to the first local oscillation signal; a first phase-locked loop (PLL) for controlling the first local oscillation signal in a direction where the sum of the frequency deviation between the first local oscillation signal and a reference frequency signal and the frequency deviation between the second local oscillation signal and the reference frequency signal is removed; and a second PLL for controlling the third local oscillation signal in a direction where the frequency deviation between the third local oscillation signal and the reference frequency signal is removed.

REFERENCES:
patent: 5398002 (1995-03-01), Bang
patent: 5519885 (1996-05-01), Vaisnen
patent: 5528633 (1996-06-01), Halik et al.
patent: 5533060 (1996-07-01), Kameo et al.
patent: 5557644 (1996-09-01), Kuwabara
patent: 5564099 (1996-10-01), Yonekura et al.
patent: 5579346 (1996-11-01), Kanzaki
patent: 5802447 (1998-09-01), Miyazaki

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