Synchronization of a data communication receiver with a received

Details Synchronization of a data communication receiver with a received Synchronization of a data communication receiver with a received

1978-12-22

1981-09-15

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

375114, 375116, 333 18, 364724, H04B 304

Patent

active

042901391

ABSTRACT:
Portions of an adaptive equalizer can be used for exact preamble synchronization by modifying the digital filter section to recognize pre-determined sequences of signals in the received signal. This may be accomplished by applying to the modifying means of the digital filter input signals which are proportional to the complex conjugate of the signals in the received signal. When the signals in the tapped delay line are aligned with this complex conjugate, the output of the summing means will be discernibly greater than otherwise. As a result, a threshold device can be used to recognize the exact baud time the preselected signals in the received signal are contained in the tapped delay line.

REFERENCES:
patent: 3715665 (1973-02-01), Chang
patent: 3914691 (1975-10-01), Meadors, Jr.
patent: 3962637 (1976-06-01), Motley
patent: 3978407 (1976-08-01), Forney, Jr. et al.
patent: 3978435 (1976-08-01), Luvmson et al.
patent: 4021738 (1977-05-01), Gitlin et al.
patent: 4146840 (1979-03-01), McRae et al.
"Adaptive Digital Filters for Equalization of Telephone Channels", IEEE Trans. Audio & Electroacoustics vol. AU-18 No. 2 p. 195 Jun. 1970.
"Transmission Systems for Communications", Bell Telephone Labs. pp. 373-395, 722-723 Rev. 4th Ed, 1971.
"Principles of Data Communications", R. W. Lucky, pp. 22-25, 104-105 Mcraw-Hill-1968.
Spread Spectrum Systems, Dixon (Wiley & Sons 1976) p. 192.

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