Signal transmission/reception system of orthogonal frequency...

Multiplex communications – Generalized orthogonal or special mathematical techniques – Quadrature carriers

Reexamination Certificate

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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.

REFERENCES:
patent: 5107504 (1992-04-01), Nakamura et al.
patent: 5771224 (1998-06-01), Seki et al.
patent: 0929165 (1999-07-01), None
patent: 0942547 (1999-09-01), None
patent: 9130440 (1997-05-01), None
patent: 10126374 (1998-05-01), None
patent: 200092022 (2000-03-01), None
“The Journal of the Institute of Image Information and Television Engineers”, vol. 52, No. 11, 1998, pp. 1539-1545 and pp. 1658-1665.

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