Adaptive carrier detection

Details Adaptive carrier detection Adaptive carrier detection

1991-05-10

1993-11-09

Kuntz, Curtis

Pulse or digital communications

Repeaters

Testing

375 94, 375 99, 329353, 455222, 455337, H03D 104

Patent

active

052609740

ABSTRACT:
An improvement in an apparatus which uses a carrier detection threshold level for detecting a carrier signal modulated with binary data. The threshold level is dynamically changed and generally seeks a level above the background noise. The threshold level is maintained constant when the detected signal exceeds the threshold level. An evaluation circuit is able to examine the detected signal to determine whether it contains data or only noise, and if it contains only noise, a possible trapped condition is avoided by raising the threshold level to a level higher than the background noise.

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patent: 4815106 (1989-03-01), Propp et al.
patent: 4918690 (1990-04-01), Markkula, Jr. et al.
"Errors-and-Erasures Coding to Combat Impulse Noise on Digital Subscriber Loops" IEEE Transactions on Communications, vol. 38, No. 8, Aug. 1990.

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