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:
Jun. 14, 2011
Filed:
Sep. 06, 2006
Masayoshi Tanaka, Tokyo, JP;
Takuya Eguchi, Tokyo, JP;
Masayoshi Tanaka, Tokyo, JP;
Takuya Eguchi, Tokyo, JP;
Nihon University, Tokyo, JP;
Abstract
N (integer equal to or above 3) quaternary phase shift keying (QPSK) outputs having different amplitude levels, i.e., r2=r1×2, i=2 . . . N with respect to a maximum amplitude level r1 are superposed after power amplification to form M(=2)-valued/quadrature amplitude modulation (QAM), and N-1 outputs si except the quaternary phase shift keying QPSK-having the maximum amplitude r1 are subjected to power amplification in this formation, then the outputs are combined by a directional coupler to obtain a combined signal, and an output of the quaternary phase shift keying QPSK-and the combined signal are transmitted from two systems of antennas to be vectorially superposed and combined in a space.