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. 19, 1992
Filed:
Jun. 19, 1989
Yuuri Yamamoto, Kanagawa, JP;
Mitsuo Makimoto, Yokohama, JP;
Abstract
A base station transmits a radio-frequency signal to a mobile station. The radio-frequency signal includes a frequency calibration signal. The mobile station includes a receiver receiving the radio-frequency signal. The receiver includes a referance oscillator generating a reference signal whose frequency is controlled in accordance with the frequency calibration signal. The receiver includes mixers and local oscillators. The mixers mix the radio-frequency signal with local oscillator signals from the local oscillator signals and convert the radio-frequency signal into a corresponding intermediate-frequency signal. The local oscillator signals are synchronized with the reference signal. The frequency of the intermediate-frequency signal is divided to derive a frequency-divided signal. The frequency of the reference signal is controlled in accordance with the frequency-divided signal.