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:
Dec. 07, 1999
Filed:
Nov. 07, 1996
Makoto Uchishima, Kawasaki, JP;
Hajime Hamada, Kawasaki, JP;
Fujitsu Limited, Kanagawa, JP;
Abstract
In order to avoid a floor phenomenon of an error rate without insertion of a datum signal, a fading equalizer, for which it is assumed that a series of symbols that represent quadrature detect output are I(n) and Q(n) (n: natural number) and an assumed maximum fading frequency is F(max), and which demodulates a modulation wave that is to be transmitted whose data are carried by phase or amplitude modulation, or both, of a radio frequency carrier, includes a symbol extractor, for performing sampling of a signal at time intervals of 1/(2 F.sub.max) or smaller, in accordance with the series of symbols; N fading estimation units, for calculating a series of fading vectors F.sub.v (n) by using tentative transmission signals, signals for which likelihood is determined, and extracted symbols; N compensators, for performing fading compensation for the series of symbols by using fading that is estimated by the fading estimation units; and a selector for selecting one of a series of N symbols that are obtained by the fading compensation.