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Noise measurement

About: Noise measurement is a research topic. Over the lifetime, 19776 publications have been published within this topic receiving 308180 citations.


Papers
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Patent
12 Feb 2002
TL;DR: In this article, an interference detector is used to choose an appropriate compensation filter and select between adaptive and deterministic moving average models for noise prediction, after compensation filtering, a new channel estimate and noise vector is calculated.
Abstract: A novel and useful apparatus for and method of interference reduction in a communications receiver. The invention first finds the channel estimate (70) and the noise vector (74) from the receive signal. An interference detector (78) is then used to choose an appropriate compensation filter and select between adaptive and deterministic moving average models for noise prediction. After compensation filtering, a new channel estimate and noise vector is calculated. The new noise vector is used to determine noise whitening coefficients if the adaptive model is used. In the deterministic model case, the coefficients do not need to be calculated since they are already known, having been calculated a priori. The noise whitening coefficients are then used in an equalizer (58) such as a Viterbi algorithm based equalizer.

115 citations

Journal ArticleDOI
TL;DR: The interreciprocal adjoint network concept is applied to the computer simulation of electronic-circuit noise performance, allowing consideration of an arbitrarily large number of uncorrelated noise sources with less effort than for the original small signal.
Abstract: The interreciprocal adjoint network concept is applied to the computer simulation of electronic-circuit noise performance. The method described is extremely efficient, allowing consideration of an arbitrarily large number of uncorrelated noise sources with less effort than for the original small signal a.c. analysis. Because all noise sources may be considered, no a priori assumption need be made as to which noise sources are dominant in a complicated circuit. The method is illustrated with an operational- amplifier example.

115 citations

Journal ArticleDOI
TL;DR: In this article, the performance of 2D wavelength hopping/time spreading CDMA systems is limited by the occurrence of the beat noise between the components of the signal and the multiple user interference.
Abstract: The system performance of 2-D wavelength hopping/time spreading CDMA systems is found to be limited by the occurrence of the beat noise between the components of the signal and the multiple user interference. The variance of the noise is determined and the probability of error is calculated for a general system employing asymmetric prime-hop sequences. A comparison with an idealized system neglecting the beat noise reveals that the system performance is seriously affected by the beat noise.

114 citations

Journal ArticleDOI
TL;DR: It is found that SNR is not significantly affected by the electrolyte concentration, composition, or pH, leading to the conclusion that the major contributions to the SNR come from the intrinsic device quality.
Abstract: The signal-to-noise ratio (SNR) for silicon nanowire field-effect transistors operated in an electrolyte environment is an essential figure-of-merit to characterize and compare the detection limit of such devices when used in an exposed channel configuration as biochemical sensors. We employ low frequency noise measurements to determine the regime for optimal SNR. We find that SNR is not significantly affected by the electrolyte concentration, composition, or pH, leading us to conclude that the major contributions to the SNR come from the intrinsic device quality. The results presented here show that SNR is maximized at the peak transconductance.

114 citations

Journal ArticleDOI
Abstract: Recorded seismic signals are often corrupted by noise. We have developed an automatic noise-attenuation method for single-channel seismic data, based upon high-resolution time-frequency analysis. Synchrosqueezing is a time-frequency reassignment method aimed at sharpening a time-frequency picture. Noise can be distinguished from the signal and attenuated more easily in this reassigned domain. The threshold level is estimated using a general cross-validation approach that does not rely on any prior knowledge about the noise level. The efficiency of the thresholding has been improved by adding a preprocessing step based on kurtosis measurement and a postprocessing step based on adaptive hard thresholding. The proposed algorithm can either attenuate the noise (either white or colored) and keep the signal or remove the signal and keep the noise. Hence, it can be used in either normal denoising applications or preprocessing in ambient noise studies. We tested the performance of the proposed method on s...

114 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202377
2022162
2021495
2020525
2019489
2018755