Multiplex communications – Generalized orthogonal or special mathematical techniques – Quadrature carriers
Reexamination Certificate
2006-03-21
2006-03-21
Nguyen, Chau (Department: 2661)
Multiplex communications
Generalized orthogonal or special mathematical techniques
Quadrature carriers
C370S482000
Reexamination Certificate
active
07016298
ABSTRACT:
A transmission apparatus of orthogonal frequency division multiplexing for multiplexing a plurality of carriers orthogonal to one another to transmit a modulated signal. The transmission apparatus includes a first modulator for outputting a code modulated in accordance a modulation scheme which can be applied with a synchronous detection for demodulation, a second modulator for outputting a code modulated in accordance with a modulation scheme different from the modulation scheme associated with the first modulator, and a distributing circuit for distributing the codes modulated by the first and second modulators to a plurality of carriers. The distributing circuit distributes the code modulated by the second modulator to all or some of carriers existing within a predetermined number of columns from at least one of both end regions of a signal transmission frequency band, and the code modulated by the first modulator to the remaining carriers.
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“The Journal of the Institute of Image Information and Television Engineers”, vol. 52, No. 11, 1998, pp. 1539-1545 and pp. 1658-1665.
Akiyama Toshiyuki
Ikeda Tetsuomi
Okabe Satoshi
Tsukamoto Nobuo
Hitachi Kokusai Electric Inc.
Mattingly ,Stanger ,Malur & Brundidge, P.C.
Moore Ian N.
Nguyen Chau
Nippon Hoso Kyokai
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