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Constrained clipping for peak-to-average power ratio (crest factor) reduction in multicarrier transmission systems

  • US 20080019453A1
  • Filed: 12/11/2006
  • Published: 01/24/2008
  • Est. Priority Date: 10/27/2005
  • Status: Active Grant
First Claim
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1. Signal transmission apparatus, comprising:

  • a clipping module for clipping a multicarrier time-domain signal at a predetermined clipping level to produce a clipped multicarrier signal;

    a transforming module for Fourier transforming the clipped multicarrier signal into the frequency domain to produce a frequency domain clipped multicarrier signal;

    an in-band processing module for processing the frequency domain clipped multicarrier signal, if required, to produce a signal whose error vector magnitude is below a predetermined threshold and whose peak-to-average power ratio (PAR) is at a relatively low level;

    an out-of-band processing module for processing the frequency domain clipped multicarrier signal to satisfy an out-of-band spectral power mask; and

    an inverse transforming module for inverse Fourier transforming the combined in-band and out-of-band processed signal to produce a low-PAR time-domain signal.

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