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:
Sep. 15, 1998
Filed:
Sep. 13, 1996
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A demoodulator apparatus for a TDM radio receiver successively compares a sampled quadrature baseband signal with a known pilot symbol sequence to detect timings of correlation with a periodically received pilot symbol sequence, with a resultant correlation signal being used in generating a frame synchronizing signal as a basic timing reference signal, and with a degree of dispersion of the correlation signal being detected and used to modify generation of the frame synchronizing signal such as to minimize the effects of adverse radio signal reception conditions on that signal. In addition, demodulation of a quadrature phase-modulated carrier to obtain a quadrature baseband signal is executed by a pseudo-coherent process based on periodic estimation of a frequency offset, with a degree of compensation applied for the offset being accordingly periodically updated, making use of an automatic frequency control loop unnecessary.