Receiver circuit for a mobile communications system

Details Receiver circuit for a mobile communications system Receiver circuit for a mobile communications system

1997-10-16

1999-08-31

Pham, Chi H.

Pulse or digital communications

Receivers

375344, 375362, 4551921, 455259, 331 1A, 329358, H03K 900, H04L 2706, H04B 118, H03D 100

Patent

active

059463589

ABSTRACT:
A PHS relay station demodulates a digital signal from a received radio-frequency signal by use of a reproduction clock produced from the digital signal. The relay station has an oscillator which generates a clock and a variable-ratio frequency divider for the clock outputted from the oscillator. A bit clock is produced from the output of the divider. A signal processor processes the digital signal by use of the bit clock. A detector detects a specific code in the digital signal in synchronism with the bit clock. The length of time that passes after the specific code detection signal is generated until the reproduction clock changes its level is detected as the phase deviation between the reproduction clock and the bit clock. The phase deviation is eliminated by temporarily changing the frequency division ratio of the divider in accordance with the amount of the deviation.

REFERENCES:
patent: 4825437 (1989-04-01), Balech
patent: 5436591 (1995-07-01), Henze
patent: 5724360 (1998-03-01), Lundh et al.

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