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Programmable modem apparatus for transmitting and receiving digital data, design method and use method for the modem

  • US 6,898,233 B2
  • Filed: 09/27/2002
  • Issued: 05/24/2005
  • Est. Priority Date: 10/04/1995
  • Status: Expired due to Term
First Claim
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1. A method for transmitting spread spectrum signals, comprising:

  • dividing an input data signal among a plurality of parallel segments of transmission data;

    spreading each of the plurality of parallel segments to form parallel spread signals using orthogonal or semi-orthogonal PN codes;

    summing the parallel spread signals to generate a sum signal;

    digitally filtering the sum signal to generate a baseband signal;

    converting the baseband signal to an intermediate frequency signal; and

    transmitting the intermediate frequency signal.

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