Receiver

Details Receiver Receiver

1996-07-18

1998-07-28

Mullen, Thomas

Telecommunications

Receiver or analog modulated signal frequency converter

Local control of receiver operation

4551861, 455262, 455254, H04B 106

Patent

active

057873429

ABSTRACT:
In a receiver of the present invention, a local oscillator frequency, used as a basis for a reception unit to demodulate a received signal, is generated by a local oscillator based on a reference frequency, which is generated by a voltage-controlled oscillator whose oscillation frequency is adjusted by a control voltage applied thereto. The control voltage is prescribed by a decoding unit which monitors a reception electric field intensity (RSSi) or an error rate in the reception unit. The control voltage is adjusted in a manner to increase the reception electric field intensity (RSSi) or reduce the error rate. When the local oscillator frequency experiences a large deviation and the signal cannot be received with good reception sensitivity, the decoding unit generates a control voltage in a manner so as to eliminate the deviation and applies the generated control voltage to the voltage-controlled oscillator for automatically adjusting the local oscillator frequency to a level having a reduced deviation.

REFERENCES:
patent: 4726051 (1988-02-01), Schuermann
patent: 4761825 (1988-08-01), Ma
patent: 4903329 (1990-02-01), Marik et al.
patent: 4921467 (1990-05-01), Lax
patent: 5410733 (1995-04-01), Niva
patent: 5479452 (1995-12-01), Hayes et al.
patent: 5557244 (1996-09-01), Salvi

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