Multi-value modulation/demodulation method and multi-value...

Details Multi-value modulation/demodulation method and multi-value... Multi-value modulation/demodulation method and multi-value...

2011-06-14

2011-06-14

Liu, Shuwang (Department: 2611)

Pulse or digital communications

Transmitters

Quadrature amplitude modulation

C375S296000, C375S308000, C375S130000

Reexamination Certificate

active

07961813

ABSTRACT:
N (integer equal to or above 3) quaternary phase shift keying (QPSK) outputs having different amplitude levels, i.e., r2=r1×2−(i−1), i=2 . . . N with respect to a maximum amplitude level r1 are superposed after power amplification to form M(=22N)-valued/quadrature amplitude modulation (QAM), and N-1 outputs si except the quaternary phase shift keying QPSK-1having 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-1and the combined signal are transmitted from two systems of antennas to be vectorially superposed and combined in a space.

REFERENCES:
patent: 5612651 (1997-03-01), Chethik
patent: 6118987 (2000-09-01), Hiramatsu et al.
patent: 6185259 (2001-02-01), Dent
patent: 7095274 (2006-08-01), Lopez Villegas et al.
patent: 200464154 (2004-02-01), None
patent: 2004104503 (2004-04-01), None

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