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Pre-distorter for orthogonal frequency division multiplexing systems and method of operating the same

  • US 20060039498A1
  • Filed: 08/17/2005
  • Published: 02/23/2006
  • Est. Priority Date: 08/19/2004
  • Status: Abandoned Application
First Claim
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1. A pre-distorter in combination with a high power amplifier in a communication system comprising a digital nonlinear signal processing device of an orthogonal frequency division multiplexing (OFDM) signal, which device is placed before the high power amplifier, which power amplifier provides as high a power as possible for the OFDM signal being passed by the high power amplifier to the communication system, where the power amplifier has a normal linear range outside of which the power amplifier is nonlinear, and where the pre-distorter inverts the nonlinearity of the power amplifier, so that the combination of the pre-distorter and high power amplifier collectively exhibit a linear characteristic beyond the normal linear range of the high power amplifier, where the pre-distorter is characterized by an exact analytic expression for the description of the input-output characteristic of the pre-distorter based on an analytic model for the high power amplifier.

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