Adaptive limiter/detector which changes time constant upon detec

Details Adaptive limiter/detector which changes time constant upon detec Adaptive limiter/detector which changes time constant upon detec

1987-06-03

1989-04-11

Griffin, Robert L.

Pulse or digital communications

Repeaters

Testing

375114, 307359, H04L 2506

Patent

active

048212920

ABSTRACT:
A limiter/detector which takes advantage of the characteristics of the dotting pattern preceding each message in the General Electric Public Service Trunking System shortens bit synchronization acquisition time and improves incoming signal detection. Since the lowest frequency component in the dotting pattern is 4800 Hz, the time constant of the receiver adaptive limiter is decreased from 0.1 seconds to 0.33 microseconds (corresponding to a cut-off frequency of 3 KHz) during the time a dotting pattern is (or might be) received. This decreased time constant allows the limiter to adapt much more rapidly to the DC component of the incoming data signal. Upon successful decoding of the dotting pattern preceding the message, the limiter circuit time constant is changed to 0.1 seconds to allow lower frequency digital data signal components (e.g., those lower frequency components associated with word sync patterns such as Barker codes) to be detected. The limiter provides the advantages of decreased falsing rate, more reliable detection of word sync, more rapid acquisition of bit sync, better utilization of processing resources, simplification of initial signal detection routines and/or circuitry, and more rapid adaptivity to incoming signalling.

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