Data recovery technique which avoids a false convergence state

Details Data recovery technique which avoids a false convergence state Data recovery technique which avoids a false convergence state

1993-11-17

1996-04-23

Chin, Stephen

Pulse or digital communications

Equalizers

Automatic

3647242, H04L 2701, G06F 1710, H04B 304, H04B 7005

Patent

active

055110924

ABSTRACT:
An adaptive circuit is used in the process of recovering data from a signal received from a communications channel. This circuit scripts or varies its transfer function in response to a first error signal derived from the received signal. This adaptation results in the device's transfer function settling to a converged state. An auxiliary information recovery circuit receives the recovered data and derives auxiliary information therefrom. To avoid the problem of false state convergence, the auxiliary information circuit provides a second error signal which causes the adaptive device to reinitiate the adaptation process. In the disclosed embodiment, the adaptive circuit is an equalizer and the auxiliary information recovery circuit is one which recovers framing information or is an error correction circuit. The inability of the auxiliary information circuit to function properly is used as an indication of false convergence of the adaptive circuit.

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European Search Report dated Feb. 13, 1995, regarding EPO application No. EP 94 30 8235.
EP-A-0 235 300 published Sep. 09, 1987. Listed as particularly relevant if taken alone as to claims 1-7, 9 and 13 on European Search Report regarding EPO application EP 94 30 8235.
Patent Abstracts of Japan, vol. 14, No. 2 (E-868) Jan. 8, 1989, and JP-A-01 251 970 Oct. 6, 1989. Listed as particularly relevant if taken alone as claims 1-3, 5, 9 and 13 on European Search Report regarding EPO application EP 94 30 8235.
EP-A-0 055 922 published Jul. 14, 1982. Listed as particularly relevant if taken alone as to claims 1,2,6,7,9 and 13 on European Search Report regarding EPO application EP 94 30 8235.
J. D. Wang and J. J. Werner, Twenty-Second Annual Asilomar Conference on Signals, Systems, and Computers, Session MP3: "Communications Applications" in Pacific Grove, California, On The Transfer Function of Adaptive T/4 Equalizers, Nov. 1, 1988, Maple Press. Comments: The submitted document is provided for background purposes and, more specifically, for its disclosure of false convergence states.

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