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:
Jun. 07, 1994
Filed:
Mar. 01, 1993
Munehiko Sumiya, Saitama, JP;
Hideyuki Shinonaga, Saitama, JP;
Kokusai Denshin Denwa Co., Ltd., Tokyo, JP;
Abstract
A spread spectrum communication system has a plurality of transmit ends capable of simultaneous communications and at least one receive end. Each of the transmit ends modulates digital information by a PN code to provide a spread signal, modulates a carrier by the spread signal to provide modulated signal, and then transmits the modulated signal to the receive end. These transmit ends use the same PN code for spreading the respective digital information and use carriers having different frequencies from each other so that spectrums of at least two of the modulated signals overlap each other. The receive end receives signals transmitted from the transmit ends to provide a received signal, frequency-converts the received signal to provide a converted signal, and calculates a correlation between the converted signal and the PN code to recover the digital information transmitted from the desired transmit end. This receive end extracts a signal having a center frequency which corresponds to the carrier frequency of the desired transmit end to provide the converted signal.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile