Radio paging system for improving message receive ratio by reduc

Details Radio paging system for improving message receive ratio by reduc Radio paging system for improving message receive ratio by reduc

1997-11-24

1999-05-11

Vo, Nguyen

Telecommunications

Transmitter and receiver at separate stations

4552501, 455254, 455295, 455308, 455 63, H04B1/10

Patent

active

059038187

ABSTRACT:
A pager includes a radio frequency (RF) attenuator which is initially rendered inoperative and which initiates attenuation of an incoming RF signal in response to a control signal. An amplifier is coupled to amplify the output of the attenuator. A signal level monitor (24, 26), coupled to the amplifier, determines if the output of the amplifier exceeds a predetermined level. A demodulator (16) is coupled to reproduce a base band signal from the output of the amplifier. A controller, following the demodulator, attempts to establish bit sync during each of a plurality of conventional and intermittently executed preamble searches. If bit sync is not established in a given preamble search and if the level monitor indicates that the output of the amplifier exceeds the predetermined level, the controller applies the control signal to the attenuator for activating the attenuator. Further, the controller extends the given preamble search by a predetermined time period for further determining whether or not bit sync is established. The attenuator, once being energized, continues to attenuate incoming RF signals until a predetermined time period elapses and another high input signal is received without establishing bit sync.

REFERENCES:
patent: 4817198 (1989-03-01), Rinderle
patent: 5144296 (1992-09-01), DeLuca et al.
patent: 5170392 (1992-12-01), Riordan
patent: 5369799 (1994-11-01), Tsunoda
patent: 5448774 (1995-09-01), Yokozaki et al.
patent: 5507022 (1996-04-01), Uomoto
patent: 5513387 (1996-04-01), Saito et al.

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