Radio communication apparatus capable of switching modulation schemes

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United States of America Patent

PATENT NO 8218680
SERIAL NO

13093301

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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A transmitting apparatus includes a modulation signal generating section that generates a modulation signal by modulating transmission data using one of a plurality of modulation schemes. The plurality of modulation schemes include a first modulation scheme, a second modulation scheme, and a third modulation scheme, where the first modulation scheme has maximum m-ary modulation value, the second modulation scheme has a lower m-ary modulation value than the first modulation scheme, and the third modulation scheme has a lower m-ary modulation value than the second modulation scheme. The transmitting apparatus also includes a pilot signal generating section that generates a pilot signal having one of a plurality of amplitudes, the pilot signal having a lower amplitude than a maximum amplitude of the first modulation scheme. The transmitting apparatus further includes a selection section that selects the modulation signal or the pilot signal according to a frame timing signal and generates a transmission quadrature baseband signal, a radio section that converts the transmission quadrature baseband signal to a radio signal, an amplifying section that amplifies the radio signal, and an antenna section that transmits the amplified radio signal.

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Patent Owner(s)

Patent OwnerAddress
REDWOOD TECHNOLOGIES LLC200 CRESCENT CT SUITE 1550 DALLAS TX 75201

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Abe, Katsuaki Kawasaki, JP 78 1401
Matsuoka, Akihiko Yokohama, JP 195 3221
Murakami, Yutaka Yokohama, JP 794 6714
Orihashi, Masayuki Ichikawa, JP 218 3557
Takabayashi, Shinichiro Kawasaki, JP 52 1008

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