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. 10, 1989
Filed:
Mar. 18, 1988
Alain Saussier, Argenteuil, FR;
Bruno R Sebilet, Rueil Malmaison, FR;
Abstract
In a method of coding and decoding a broadband transmission of the spread spectrum type, the signal to be transmitted is encoded by modulation in accordance with a code consisting of a pseudo-random binary sequence of period T composed of two alternating half-sequences of period T/2 and having virtually nil cross-correlation. In the receiver a reception code is generated which is the same as the transmission code except that one of the half-sequences of the reception code is shifted in a circular rotational sense relative to the corresponding half-sequence of the transmission code. This reception code enables synchronization of the transmission and reception code generators by correlation of the reception code with the received coded signal using only one correlator, and is also used to control a demodulator for decoding the received signal.