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:
May. 12, 1992
Filed:
Jun. 21, 1990
Hiroyasu Muto, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
A particular signal sequence corresponding in a received signal to a symbol pattern consisting of a predetermined number of symbols at a symbol interval, is detected by sampling (45-48) into phase samples substantially at the symbol interval of a phase of a signal vector obtained by coherent detection (11) of the received signal, calculation (51-52) of phase differences, each between two consecutive phase differences, detection (56-57) of consecutive instances of coincidence of each phase difference substantially with a predetermined phase difference, and determination (58-60) of presence of the signal sequence in the received signal when the instances of coincidence substantially reach in number to the predetermined number. Preferably, the sampling is carried out my making (11) I and Q signals represent the phase and converting (46-48) and I and Q signals to the phase samples by using a clock generator (45). When produced (46-47), I and Q digital signals represent their amplitudes, which are subjected to conversion (48) into the phase samples. The conversion, calculation, detection, and determination can be processed by a digital signal processor.