Pulse or digital communications – Receivers – Interference or noise reduction
Reexamination Certificate
2006-02-28
2009-11-03
Liu, Shuwang (Department: 2611)
Pulse or digital communications
Receivers
Interference or noise reduction
C342S357490, C342S453000, C375S130000, C375S136000, C375S142000, C375S147000, C375S150000, C701S213000
Reexamination Certificate
active
07613258
ABSTRACT:
A method for estimating signal quality of a spread spectrum signal is provided. The method includes squaring a plurality of in-phase correlation results and a plurality of quadrature correlation results, summing each squared in-phase correlation result and the corresponding correlation result to obtain a plurality of sum-of-square values, detecting a peak value among the plurality of sum-of-square results, calculating an average of non-peak values among the plurality of sum-of-square results. The peak value is regarded as a signal power value, while the averaged non-peak values are regarded as an average noise power value. A signal-to-noise ratio is then calculated based on the signal power value and the average noise power value. A method for determining the parameters for the tracking loop is also provided. The method includes estimating the signal-to-noise ratio of the spread spectrum signal, and determining the tracking loop parameters based on the signal-to-noise ratio.
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Cheng MingQiang
Hou Jianhui
Li ShiJie
Yu Bo
Liu Shuwang
O2Micro International Ltd.
Patel Dhaval
Wang Li K.
Wang Law Firm, Inc.
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