×

Inverse Signal Transformation

  • US 20120307923A1
  • Filed: 12/12/2011
  • Published: 12/06/2012
  • Est. Priority Date: 06/25/2003
  • Status: Active Grant
First Claim
Patent Images

1. A method for data recovery from preprocessed subspaces of OFDM signal (DRPS OFDM) for recovering transmitted data from a preprocessed signal produced by a transmission channel which includes a data coding circuit, encoding said transmitted data into transmitted OFDM frames defining data carrying tones or sub-bands, and a signal transmission link and a preprocessor of received OFDM frames, transforming said transmitted OFDM frames into preprocessed signal subspaces representing specific OFDM tones or sub-bands, wherein said link introduces deterministic or random distortions affecting received signal subspaces and said preprocessor transforms said received signal subspaces into said preprocessed signal subspaces;

  • wherein the DRPS OFDM comprises;

    deriving an inverse transformation reversing a transfer function of said transmission channel, in order to enable recovery of said transmitted data from specific said preprocessed subspaces identified as comprising specific said preprocessed signals;

    comparing a set of samples of an interval of said preprocessed signal with elements of a reference frame related to a particular said preprocessed signal subspace,wherein this particular reference frame corresponds to a half-cycle or cycle of a particular said tone or sub-band represented by this preprocessed signal subspace;

    using a result of a single said comparison or results of multiple said comparisons for identifying a specific said preprocessed subspace which said preprocessed signal interval belongs to;

    applying said inverse transformation to the identified subspace in order to recover transmitted data carried by said preprocessed signal interval.

View all claims
  • 0 Assignments
Timeline View
Assignment View
    ×
    ×