Carrier recovery control with sequential FEC sync detection and

Details Carrier recovery control with sequential FEC sync detection and Carrier recovery control with sequential FEC sync detection and

1992-03-20

1993-07-20

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

3701054, H04J 306

Patent

active

052299970

ABSTRACT:
At the transmit end of a communications system, a convolutional code of a multiplex of an information-bearing signal and a unique word is modulated upon a transmitted carrier. At the receive end, the transmitted carrier is demodulated with a local carrier to detect the convolutional code. The error rate of a decoded version of the convolutional code is determined, and an out-of-FEC-sync signal is produced when the error rate is higher than a threshold value. Unique words are detected from the decoded signal and counted during a prescribed time interval to produce an out-of-frame-sync signal when the count falls below a threshold. The frequency of the local carrier is swept in the presence of the out-of-FEC-sync signal. When the signal ceases to exist, a timeout period is set, and the local carrier frequency is swept again when the timeout period expires during the presence of the out-of-frame-sync signal.

REFERENCES:
patent: 5161194 (1992-11-01), Ujiie

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