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Non-linear constant envelope modulator and transmit architecture

  • US 6,078,628 A
  • Filed: 03/13/1998
  • Issued: 06/20/2000
  • Est. Priority Date: 03/13/1998
  • Status: Expired due to Term
First Claim
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1. A constant envelope modulator and transmit architecture for a wireless transmission system, comprising:

  • a constant envelope modulator including;

    an input means for receiving data to be transmitted;

    a differential encoder for creating a modulation signal having an in-phase modulation component and a quadrature modulation component from said received data; and

    a constant envelope generation means for removing amplitude information from the modulation signal to convert the modulated signal into constant envelope in-phase and quadrature modulation signals and an amplitude envelope signal;

    adding means for combining said constant envelope in-phase and quadrature modulation signals at a frequency for transmission to produce a constant envelope phase modulation signal; and

    a power amplifier for amplifying the constant envelope phase modulation signal to a desired power level for transmission;

    wherein the amplitude envelope signal is combined with the constant envelope phase modulation signal in the power amplifier after the constant envelope phase modulation signal has been amplified.

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