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Multichannel radio frequency transmission system to deliver wideband digital data into independent sectorized service areas

  • US 6,243,427 B1
  • Filed: 01/07/1998
  • Issued: 06/05/2001
  • Est. Priority Date: 11/13/1995
  • Status: Expired due to Term
First Claim
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1. In a communication system in which a digital signal is modulated into a conventional staggered QPSK (SQPSK) formatted signal and said SQPSK signal has associated undesired amplitude variations, a modulation and amplification method comprising the steps of:

  • modulating said digital signal to generate an intermediate modulated signal having less amplitude variations than said conventional SQPSK formatted signal; and

    amplifying said intermediate modulated signal with a saturating non-linear amplifier to generate said conventional SQPSK formatted signal;

    wherein said step of modulating restricts phase changes to +45°

    , 0°

    , and −

    45°

    when said intermediate modulated signal changes logic states.

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