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Constrained-envelope digital-communications transmission system and method therefor

  • US RE41,380 E1
  • Filed: 11/19/2003
  • Issued: 06/15/2010
  • Est. Priority Date: 08/28/1998
  • Status: Expired due to Term
First Claim
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1. A constrained-envelope digital communication transmitter circuit comprising:

  • a pulse-spreading filter configured to receive a quadrature phase-point signal stream of digitized quadrature phase points and produce a filtered signal stream, said filtered signal stream exhibiting energy corresponding to each phase point spread throughout a plurality of unit baud intervals;

    a constrained-envelope generator coupled to said pulse-spreading filter and configured to produce a constrained-bandwidth error signal stream;

    a combining circuit coupled to said pulse-spreading filter and to said constrained-envelope generator, said combining circuit configured to combine said filtered signal stream and said constrained-bandwidth error signal stream to produce a constrained-envelope signal stream; and

    a substantially linear amplifier having an input coupled to said combining circuit.

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