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Apparatus and method for digital pre-distortion, sharing feedback path in a multiple antenna wireless communication system

  • US 8,218,678 B2
  • Filed: 01/21/2009
  • Issued: 07/10/2012
  • Est. Priority Date: 01/23/2008
  • Status: Active Grant
First Claim
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1. A Digital Pre-Distortion (DPD) power amplifier apparatus of a transmission end comprising a plurality of transmission paths in a multiple antenna wireless communication system, the apparatus comprising:

  • a plurality of amplifiers for amplifying an input signal directed to each of the transmission paths;

    a plurality of couplers for coupling amplified signals on respective transmission paths;

    a switch for outputting at least one of the amplified signals coupled on the respective transmission paths;

    a shared feedback path for providing the amplified signal output from the switch to a plurality of processors;

    a controller that is configured to output a reference signal to each of the transmission paths in order to determine a feedback path gain comprising a path gain from an input terminal of a coupler on each transmission path to a feedback input terminal of a respective processor; and

    the plurality of processors for comparing a feedback signal provided through the shared feedback path with the input signal and for pre-distorting the input signal such that the input signal and the amplified signal are linear with each other.

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