Methods and apparatus for detecting cellular digital packet data (CDPD)
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United States of America Patent
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Feb 17, 1998
Issued Date -
N/A
app pub date -
Apr 18, 1995
filing date -
Sep 14, 1993
priority date (Note) -
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Abstract
Disclosed herein are methods and apparatus for detecting the presence of a CDPD carrier in a channel of a cellular system (although the invention is broadly applicable to detecting a specific kind of carrier associated with an 'overlay' system, wherein an 'overlay' system is one that shares the frequency allocation of another system on a non-cooperating basis). This specification describes a spectral estimation technique for detection of a CDPD carrier. In addition, this specification describes an MMSE (minimum mean-squared error) method that improves on the spectral estimation method.
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