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:
Apr. 06, 2004
Filed:
Jul. 14, 2000
Kenichi Shiraishi, Yokohama, JP;
Akihiro Horii, Zama, JP;
Kabushiki Kaisha Kenwood, Tokyo, JP;
Abstract
To provide a receiver not requiring any large circuit. A carrier-wave-phase-error table - A for BPSK modulation in which a range equal to or more than 0 of I-axis is defined is prepared for a carrier-wave regenerating circuit A of a demodulating circuit A for orthogonally detecting a received signal in which digital signals according to BPSK, QPSK, and 8PSK modulations are time-multiplexed and outputting I and Q symbol-stream data I and Q for each symbol. When a remapper A outputs I and Q obtained by inversely phase-rotating I and Q by −&THgr; against a received-signal-phase rotation angle &THgr; and generating an absolute phase of I and Q , a phase-error detecting circuit obtains a shift angle &THgr;′ up to a target phase convergent angle of a received-signal point shown by I and Q viewed in the positive direction of I-axis according to a modulation system currently demodulated, reads phase error data corresponding to I and Q obtained by phase-rotating I and Q by −(&THgr;+&THgr;′) by the remapper A through time sharing out of the table - A, and corrects a phase of a reference carrier wave so that the phase error data becomes zero.