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:
Nov. 27, 2007
Filed:
Jan. 09, 2003
Yozo Shoji, Tokyo, JP;
Kiyoshi Hamaguchi, Tokyo, JP;
Hiroyo Ogawa, Tokyo, JP;
Abstract
A reference local oscillation signal transmission stationradiates a reference local oscillation signal to a service zone. A portion of the signal received by each radio slave station terminalis branched and fed to an injection locked oscillator. As a result, a local oscillation signal which is synchronized with the reference local oscillation signal is obtained. In the slave station terminal, the thus-obtained local oscillation signal is fed to a transmission frequency converter (mixer)and a reception frequency converter (mixer). An IF band transmission modulated signal is fed to the mixerfor frequency conversion to a radio frequency band, and the thus-obtained radio-frequency modulated signal is transmitted. Meanwhile, a received radio-frequency modulated signal is fed to the mixerfor down conversion, and the thus-obtained signal is fed to an IF band demodulatorso as to restore an information signal. The present invention not only solves the problem of deterioration of signal quality stemming from phase noise and frequency offset generated in a millimeter wave band oscillator, but also improves the efficiency of frequency use.