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Transmitters and receiver of spectrum spread communication system, and modulation and demodulation methods thereof

  • US 20040109419A1
  • Filed: 04/24/2003
  • Published: 06/10/2004
  • Est. Priority Date: 10/24/2000
  • Status: Active Grant
First Claim
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1. A transmitter for a spread-spectrum communication system in which transmission data is subject to spectrum spreading using a predetermined number of subcarriers, comprising:

  • frame generation means constructing a frame by inserting a predetermined pilot sequence in the transmission data;

    data hopping means comprising;

    1) a hopping pattern generating unit generating a hopping pattern switched at a predetermined hopping frequency, the hopping pattern designating a subcarrier for frequency hopping; and

    2) a data selection unit outputting a plurality of subcarrier transmission signals corresponding to the plurality of subcarriers, respectively, by receiving the transmission data and outputting as a subcarrier transmission signal only the transmission data carried in a subcarrier designated by the hopping pattern, while maintaining the other subcarrier transmission signals at a zero output level, said transmitter further comprising;

    inverse Fourier transform means subjecting the entirety of subcarrier transmission signals output from said data selection unit to inverse Fourier transform so as to output frequency-hopped spread-spectrum transmission signals.

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