Search results for "Undersampling"

showing 3 items of 3 documents

Design of an efficient digital down-converter for a SDR-based DVB-S receiver

2007

This paper presents the design of an area-power efficient digital down-converter suitable for broadband communication systems. The DVB-S standard has been used as a design example. It has been shown that by selecting a bandpass sampling to generate only one spectral image, the case in which the relationship between the digital carrier frequency and the sampling frequency is 1/4, not only gives the smallest area but the lowest power consumption.

Carrier signalDigital down converterUndersamplingComputer sciencePower consumptionDigital Video BroadcastingElectronic engineeringDigital broadcastingDigital radioDVB-S2007 18th European Conference on Circuit Theory and Design
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Multiscale Granger causality analysis by à trous wavelet transform

2017

Since interactions in neural systems occur across multiple temporal scales, it is likely that information flow will exhibit a multiscale structure, thus requiring a multiscale generalization of classical temporal precedence causality analysis like Granger's approach. However, the computation of multiscale measures of information dynamics is complicated by theoretical and practical issues such as filtering and undersampling: to overcome these problems, we propose a wavelet-based approach for multiscale Granger causality (GC) analysis, which is characterized by the following properties: (i) only the candidate driver variable is wavelet transformed (ii) the decomposition is performed using the…

Computer scienceGeneralization0206 medical engineering02 engineering and technology01 natural sciencesQuantitative Biology - Quantitative MethodsCausality (physics)WaveletGranger causality0103 physical sciencesTime seriesElectrical and Electronic Engineering010306 general physicsInstrumentationbusiness.industryWavelet transformPattern recognitionFilter (signal processing)multiscale analysi020601 biomedical engineeringUndersamplingscalp EEGQuantitative Biology - Neurons and CognitionSettore ING-INF/06 - Bioingegneria Elettronica E InformaticaGranger causalityWavelet transformArtificial intelligencebusiness
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Computational imaging with a balanced detector

2016

Single-pixel cameras allow to obtain images in a wide range of challenging scenarios, including broad regions of the electromagnetic spectrum and through scattering media. However, there still exist several drawbacks that single-pixel architectures must address, such as acquisition speed and imaging in the presence of ambient light. In this work we introduce balanced detection in combination with simultaneous complementary illumination in a single-pixel camera. This approach enables to acquire information even when the power of the parasite signal is higher than the signal itself. Furthermore, this novel detection scheme increases both the frame rate and the signal-to-noise ratio of the sys…

InfraredComputer scienceVideo RecordingComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISIONImage processing02 engineering and technology01 natural sciencesSignalArticleDigital micromirror devicelaw.invention010309 opticsComputational photographyElectricitylaw0103 physical sciencesImage Processing Computer-AssistedComputer visionSimulationSignal processingMultidisciplinaryScatteringbusiness.industryDetectorSignal Processing Computer-Assisted021001 nanoscience & nanotechnologyFrame rateNumerical apertureUndersamplingArtificial intelligence0210 nano-technologyBiological imagingbusiness
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