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. 24, 2004
Filed:
Aug. 25, 2000
Kenichi Shiraishi, Yokohama, JP;
Soichi Shinjo, Machida, JP;
Akihiro Horii, Zama, JP;
Shoji Matsuda, Machida, JP;
Kabushiki Kaisha Kenwood, Tokyo, JP;
Abstract
A small scale circuit can be realized. A timing circuit detects a burst symbol signal period from outputs I and Q of a demodulating circuit A for orthogonally detecting a received signal obtained by time-multiplexing digital signals by BPSK, QPSK, and 8PSK modulation. A pattern regeneration circuit outputs the same PN code pattern as on a transmission side. Inverting circuits and output I, Q as RI, RQ for a bit '0' of a PN code pattern, and −I, −Q as RI, RQ for a bit '1'. A phase error table A contains a phase error between the phase of a received signal point as an output of the inverting circuits and and an absolute phase only for a first quadrant of RI, RQ. A phase error detecting processing circuit A reads the phase error data corresponding to the absolute value of RI, RQ, and adjusts the data into the data depending on the current quadrant of the RI, RQ. A carrier regeneration circuit A amends the phase of a reference carrier for use in orthogonal detection such that an adjusted phase error data indicates zero.