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.:
Date of Patent:
Oct. 08, 2024
Filed:
Apr. 12, 2021
Ntt Electronics Corporation, Yokohama, JP;
Yasuyuki Endoh, Yokohama, JP;
Masaaki Iizuka, Yokohama, JP;
NTT ELECTRONICS CORPORATION, Yokohama, JP;
Abstract
A frame synchronization system () according to this invention includes a frame signal generation circuit () configured to generate a frame signal including a plurality of first frame signals each including a first frame synchronization signal and a first payload signal, wherein the first frame synchronization signal is formed from at least one symbol and is set with an average amplitude lower than an average amplitude of the first payload signal, and a frame synchronization circuit () configured to receive the frame signal via an optical transmission path (), and detect the first frame synchronization signal from a received signal, wherein the received signal is divided into frames having a symbol length of the first frame signal, coordinate values, on an IQ plane, of the signals at identical symbol positions of the plurality of divided frames are added over the plurality of frames, and a symbol specified by magnitude comparison in the frame based on an addition result is determined as the first frame synchronization signal. Even if a transmission rate is high, it is possible to decrease the probability of erroneous synchronization, thereby shortening the time until frame synchronization is established.