发明名称 |
Phaselock threshold correction |
摘要 |
A noise estimator for threshold correction of a receiver includes a low pass filter to remove wideband noise from an input signal that includes a signal component and a noise component. The output of the wideband filter is applied to a square-law power detector having an output applied to an envelope detector. The output of the envelope detector is the instantaneous envelope of the input signal and is applied to a low pass filter to perform time averaging and is also applied to a differential network. The output of the low pass filter is a signal representing a time averaged statistical envelope representing the statistical mean of the instantaneous envelope of the input signal. This signal is also applied to the differential network that generates a signal representing the difference in the instantaneous envelope of the input signal and the time averaged statistical envelope signal. This difference signal is applied to a square-law power detector and then to a low pass filter for time averaging. An output of the low pass filter is a signal representing an estimate of the noise component of the input signal. |
申请公布号 |
AU4679997(A) |
申请公布日期 |
1998.06.11 |
申请号 |
AU19970046799 |
申请日期 |
1997.12.01 |
申请人 |
RAYTHEON E-SYSTEMS, INC. |
发明人 |
DONALD R STEPHENS;WILLIAM MOSLEY JR. |
分类号 |
H03G3/30;H03L7/095;H04B1/10 |
主分类号 |
H03G3/30 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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