Reception of a selective call radio signal by using threshold le

Details Reception of a selective call radio signal by using threshold le Reception of a selective call radio signal by using threshold le

1997-11-07

2000-03-07

Horabik, Michael

Communications: electrical

Continuously variable indicating

With meter reading

375286, 375287, 370310, 370313, G08B 522

Patent

active

060346205

ABSTRACT:
In a selective call radio receiver for receiving a radio communication signal to produce a communication datum of a multiplicity, such as 256, of levels and an intermittent succession of synchronization patterns, a combination of a pattern detector, a sample memory, and a threshold calculator detects a predetermined number, such as three, of detected threshold levels in each synchronization pattern. A threshold memory stores first to N-th past sets of stored threshold levels, N being equal to two or greater. Based on a current set of the detected threshold levels and the past sets, a threshold comparator generates optimum threshold levels for use in a discriminator for judging the communication datum as a multilevel, such as four-level, receiver output signal. Preferably, operation of the receiver is suspended when the detected threshold levels are abnormal, when the current and the past sets are not spaced apart by a synchronization interval, or when the optimum threshold levels are not within allowable ranges therefor.

REFERENCES:
patent: 4734694 (1988-03-01), Umetsu et al.
patent: 5425053 (1995-06-01), Matsumoto
patent: 5799043 (1998-08-01), Chang et al.
patent: 5832038 (1998-11-01), Carsello

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