SNR estimation using filters
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United States of America Patent
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Issued Date -
Jul 19, 2007
app pub date -
Jun 29, 2006
filing date -
Nov 11, 2005
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
The present invention provides a method of accurately determining the signal to noise ratio (SNR) using filters. Three embodiments of the invention are disclosed: the use of fixed filters, multiple filters and dynamic filters. The total noise energy is calculated by applying low pass and high pass filters. The minimum of the two noise energies estimated by the low pass and high pass filters is selected to calculate the total noise energy in the signal. The present invention provides an accurate method of SNR estimation in conditions of low SNR and high carrier offsets, without the requirement for bringing the signal to base band. The use of multiple filters provides accurate SNR measurement even in the presence of discrete interferences.
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