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METHOD OF PERFORMING PEAK REDUCTION AND CLIPPING MITIGATION

  • US 20130177089A1
  • Filed: 01/09/2012
  • Published: 07/11/2013
  • Est. Priority Date: 01/09/2012
  • Status: Active Grant
First Claim
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1. A computer-implemented method of performing peak reduction and clipping mitigation, comprising the steps of:

  • receiving a transmitted OFDM signal modulating a plurality of data symbols, the OFDM signal being clipped by a clipping signal c to lower the transmitted signal'"'"'s peak-to-average power ratio, the clipping signal c being sparse in time;

    compressively sensing a peak-reduced portion of the received OFDM signal by utilizing an l1 minimization scheme, an output of the compressively sensing step providing an estimate of the clipping signal c at the receiver;

    feeding through a remaining, non-peak reduced portion of the received OFDM signal;

    least squares estimating the remaining, non-peak reduced portion of the received OFDM signal, thereby providing a least squares estimated portion of the remaining, non-peak-reduced portion of the received OFDM signal;

    combining the least squares estimated portion of the received OFDM signal with the estimate of the clipping signal c, thereby resulting in a combined estimate of the transmitted OFDM signal; and

    transforming the combined estimate of the transmitted OFDM signal, thereby recovering undistorted coefficients of the transmitted OFDM signal;

    whereby, the data symbols in the transmitted OFDM signal are accurately recovered.

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