Method and apparatus for multi-level quadrature amplitude modulation

  • US 5,825,828 A
  • Filed: 07/11/1996
  • Issued: 10/20/1998
  • Est. Priority Date: 07/12/1995
  • Status: Expired due to Term
First Claim
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1. A method for modulating input data of different input bit members for each orthongonal channel by a plurality of multi-level quadrature amplitude modulations, comprising the steps of:

  • converting said input data into output data having the same bit number based on a prescribed conversion rule for each orthogonal channel;

    filtering said converted output data by a digital filter;

    converting an output of said digital filter into an analog signal by a D/A converter; and

    modulating said analog signal by a quadrature modulator.

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