Carrier to noise ratio estimations from a received signal
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United States of America Patent
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Dec 29, 2009
Grant Date -
Jan 13, 2005
app pub date -
Aug 5, 2004
filing date -
Apr 27, 2001
priority date (Note) -
In Force
status (Latency Note)
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Abstract
Techniques for measuring the carrier to noise ratio (CNR) in a received digital signal are disclosed. The methods can operate on a received digital signal, such as a layered modulation signal used in a satellite television system. The CNR measurement can be made at the output of a carrier recovery loop or a timing recovery loop in a demodulator. Alternately, the CNR measurement can be made when the received signal is digitized in an analog to digital (A/D) converter at base-band by the demodulator.
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