System for controlling and shaping the spectrum and redundancy of signal-point limited transmission

  • US 5,970,100 A
  • Filed: 03/25/1998
  • Issued: 10/19/1999
  • Est. Priority Date: 11/15/1996
  • Status: Expired due to Term
First Claim
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1. A method of spectrally shaping transmitted samples with a set of predetermined frequency characteristics and a predetermined set of allowable transmitted signal levels, wherein a transmitted sample is either of an unmodified source sample or a dependent sample, the transmitted samples being transmitted in data frames, said method comprising the steps of:

  • (a) calculating, for each of the transmitted samples, a Running Filter Sum of unwanted components up to the current sample, wherein said Running Filter Sum is based on a biquad filter;

    (b) computing an objective function in accordance with the Running Filter Sum obtained in Step (a);

    (c) selecting, for each data frame of transmitted samples, at least one redundant sample to be added or modified within the data frame such that the objective function of Step (b) is optimized.

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