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. 09, 1997
Filed:
Jul. 18, 1995
Hitachi, Ltd., Tokyo, JP;
Abstract
A mobile station of a code division multiple access mobile communication system for transmission by carrying out quadrature multiplexing of a pilot signal and a data signal having I and Q components spread by spectrum from the base station to the mobile station, includes a despreading circuit for generating phase error signals (.DELTA.I, .DELTA.Q) by despreading the quadrature multiplexed reception signals (I', Q') by using despreading codes for pilot symbol, another spreading circuit for generating a data signal group by despreading the reception signals by using spreading codes for data symbol, accumulators for converting the transmission rate of the phase error signals and the data signal group into the symbol rate, an averaging circuit for generating phase correction signals from the phase error signals of the symbol rate, and a phase correction circuit for generating data signals (I, Q) with the phase shifts being removed therefrom, by correcting the data signal group by the phase correction signals.