Method and a circuit for estimating the signal quality of a communication channel and a wireless receiving apparatus using the same
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United States of America Patent
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Issued Date -
Apr 9, 2009
app pub date -
Nov 27, 2007
filing date -
Oct 3, 2007
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A method for estimating the signal quality of a communication channel is disclosed. Firstly, an input signal passes through a match filter at the initial stage of an estimation period. Next, the output of the match filter is calculated to obtain the noise reference value within a pre-determined period. The output value of the match filter and the noise reference value are compared. When the output value of the match filter is larger than the noise reference value, a valid power value is obtained according to the output value of the match filter. The valid power values are accumulated. Finally, a SNR is calculated according to the noise reference value and the accumulated valid power value at the end of the estimation period. Thereby, the signal quality of the wireless communication channel is estimated according to the SNR, and the signal transmission rate is determined.
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