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Orthogonal modulation scheme

  • US 5,805,567 A
  • Filed: 09/13/1996
  • Issued: 09/08/1998
  • Est. Priority Date: 09/13/1996
  • Status: Expired due to Term
First Claim
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1. A method for generating communications signals, comprising the steps of:

  • (a) applying a first version of a modulation scheme to a first data stream at a carrier frequency to generate a first modulated signal;

    (b) applying a second version of the modulation scheme to a second data stream at the carrier frequency to generate a second modulated signal, wherein;

    the first and second modulated signals are within a single carrier-frequency band; and

    the second modulated signal is orthogonal to the first modulated signal; and

    (c) combining the first and second modulated signals for transmission, wherein;

    the modulation scheme has a first part and a second part that are applied in two parallel paths, a first path having a cosine function of the carrier frequency and a second path having a sine function of the carrier frequency;

    in the first version, the first path comprises the first part of the modulation scheme and a cosine function of the carrier frequency and the second path comprises the second part of the modulation scheme and a sine function of the carrier frequency; and

    in the second version, the first path comprises the second part of the modulation scheme and a cosine function of the carrier frequency and the second path comprises the first part of the modulation scheme and a sine function of the carrier frequency.

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