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. 21, 2004
Filed:
May. 10, 2002
Shusaku Fukumoto, Higashihiroshima, JP;
Takashi Nakai, Chiba, JP;
Shunsuke Araki, Higashihiroshima, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
A CDMA complex QPSK spread modulation method and apparatus are provided, which can be operated on a reduced gate scale with reduced power consumption. Digital data signals are spread modulated by multipliers, with the first spreading codes generated from first spreading code generators, so as to produce spread modulated signals. These spread modulated signals are input to a complex QPSK processor where they are subjected to a complex QPSK operation with second spreading codes generated from second spreading code generators. The resultant signals are filtered through low-pass filters. Digital-to-analog converters convert the filtered signals into analog values. Signals including the QCH data signal are processed through multipliers so as to weight them with a gain factor G from a gain factor controller.