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:
Feb. 17, 1987
Filed:
Nov. 13, 1984
Chialin Wu, Pasadena, CA (US);
Other;
Abstract
A full duplex frequency division multiplex communication system which comprises a number of transceivers constituting user stations which communicate with one another over a common channel, such as a wireless link or a two-direction coaxial cable, with each transceiver operating on a single fixed intermediate frequency for transmission and reception. The system includes a network frequency converter for shifting the transmission frequency band used by the transceivers into a different receiving frequency band which does not overlap the transmission frequency band. Single sideband modulation of the intermediate frequency carrier is used, and full duplex communication is achieved by using one of the sidebands of the intermediate frequency carrier for transmission, and the other sideband for reception. Each transceiver includes a programmable frequency synthesizer for channel selection, and upper and lower sideband filters, with one of the filters being used for transmission and the other for reception.