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Transmission device and reception device

  • US 20060008085A1
  • Filed: 04/15/2004
  • Published: 01/12/2006
  • Est. Priority Date: 04/18/2003
  • Status: Active Grant
First Claim
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1. A transmission device comprising:

  • a modulator for modulating data by a plurality of modulation methods; and

    a transmitter for transmitting a radio signal by using a plurality of carrier frequencies, wherein the transmission device transmits the data by changing a transmission communication method to another method following a lapse of time, which transmission communication method is formed by combining one of the modulation methods and one of the carrier frequencies.

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