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Error correction of MSK signals dependent on sample quality

  • US 5,583,890 A
  • Filed: 09/19/1994
  • Issued: 12/10/1996
  • Est. Priority Date: 09/19/1994
  • Status: Expired due to Term
First Claim
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1. A method for error correction of MSK-coded data comprising the steps of:

  • receiving a signal partitionable into adjacent frames each subdividable into three parts, wherein a fundamental frequency of the signal is fixed within a frame of the adjacent frames and represents a logical state of an MSK-coded data bit, and wherein the signal has a known phase relationship between the adjacent frames;

    synthesizing a first sample quality metric applicable to a portion of the signal associated with a last part of the parts of a first frame of the adjacent frames and a second sample quality metric applicable to a portion of the signal associated with a first part of the parts of a second frame following the first frame, wherein each of the first and second sample quality metrics have a magnitude dependent on a time that the associated portion of the signal has a magnitude different than an average magnitude of the signal; and

    determining a corrected polarity of the portion of the signal associated with the last part of the parts of the first frame dependent on a sample quality metric having a greater magnitude of the first sample quality metric and the second sample quality metric and providing a corrected MSK-coded data bit dependent thereon.

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