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The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.

The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.

Patent No.:

US 5768321 B1

PDFFull Text
Date of Patent:
Jun. 16, 1998

Filed:

Oct. 02, 1996

Automatic frequency control unit which detects a frame pattern in a

Applicant:
Inventors:

Hiroaki Watanabe, Yokohama, JP;

Tomoyuki Ueno, Kawasaki, JP;

Mitsuhiro Ono, Kawasaki, JP;

Seiichi Yamaguchi, Kawasaki, JP;

Assignee:

Fujitsu Limited, Kawasaki, JP;

Attorney:

Staas & Halsey

Primary Examiner:

Stephen Chin

Assistant Examiner:

Betsy L Deppe

Int. Cl.
CPC ...
H04L / ; H04L / ; H04L / ;
U.S. Cl.
CPC ...
375344 ; 4551922 ; 375329 ; 375368 ; 375362 ; 370513 ;
Abstract

An automatic frequency controller synchronizes a received carrier signal with a simulated carrier signal to automatically control a center frequency of the simulated carrier signal. The received carrier signal has a first synchronous code pattern inserted into a plurality of frame periods and a second synchronous code pattern inserted into a plurality of multiframe periods. The phase of the received carrier signal is determined by sweeping the center frequency of the simulated carrier signal and mixing the simulated carrier signal with the received carrier signal. The sweep of the center frequency of the simulated carrier signal is reduced when frame synchronization is detected and the sweep of the center frequency is fixed when multiframe synchronization is detected.

Find Patent Forward Citations

Watanabe, Hiroaki. (1998). Automatic frequency control unit which detects a frame pattern in a (U.S. Patent No. 5768321). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/5768321

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

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