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. 18, 2003
Filed:
Feb. 09, 1999
Yukie Mimura, Tokyo, JP;
Tomoki Osawa, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
A transmission apparatus and method for a frequency division multiple access (FDMA) system that uses FSK (frequency shift keying) or OOK (On/Of keying) modulation. The apparatus includes a plurality of FSK (or OOK) modulators, each of which allocates a maximum frequency shift value in the FSK (or OOK) modulation for data to be transmitted for a respective one of a plurality of channels of the FDMA system. The apparatus also includes a frequency converter for converting modulated signals output from each of the FSK (or OOK) modulators to carrier wave frequencies, and for combining the frequency-converted signals by allocating a carrier wave frequency of at least one of the plurality of channels to be between two carrier wave frequencies of another of the plurality of channels. The apparatus further includes an amplifier for amplifying the power of signal output from the frequency converter.