In this paper a 2D parametric identification algorithm of stochastic electromagnetic interference (EMI) sources based on near-field measurements is presented. The unintentional radiation electronic devices and connecting cables can be measured by using two-point planar scanning probes connected to the digital oscilloscope for ultra-wideband (UWB) time-domain data recording. characterization registered field distribution was implemented evaluating autocorrelation cross-correlation spectra....

Second order CS stochastic processes are non-stationary processes, where the TDCM depends on global time and difference, dependence is periodic. This autocorrelation function can be represented by a 2D cyclic correlation spectrum containing delta functions at frequencies multiple to cycle frequency of process. Accordingly EM field in domain dyadic. corresponding functions. The experimental characterization process shows presence spikes coinciding with signal transmission rate 1000BASE-T...

We have extended the method for modeling stochastic EM near-field which has already been described in [5, 13] stationary fields to case of cyclostationary fields. Areas application are electromagnetic interference radiated by digital circuitry inside system and also into environment, where period EMI is given clock frequency circuits.

The theoretical and experimental evaluation of the cyclostationary random data transferring process corrupted by individually jointly crosstalk interference is presented. message signals were measured real time digital oscilloscope. Autocorrelation functions evaluated synchronous cyclic averaging procedure. analyzed periodic two-dimensional impulse response time-varying filter allows to obtain output with same frequency at separation orthogonal stationary waveforms constituting input (CSRP)....

Stochastic electromagnetic fields caused by the data transferring signals along printed circuit boards are potentially harmful interference sources for modern digital electronic devices. The characterization of near-field emissions from device in time domain was implemented real-time oscilloscope conjunction with sequential scanning system probes. Excluding periodic sample mean function reveals hidden cyclostationarity process measured system. In this article, quantitative autocorrelation...

Cross-correlation analysis of the cyclostationary near-field unintentional radiations from printed circuit boards (PCB) can be used for localization transmission line paths transferring deliberately programmed pseudorandom sequences. The are formed by induced surface currents on PCB and measured magnetic probes scanning along mesh in plane parallel to PCB. extracted properties radiated emissions were synchronized ensemble averaging probe signals multiplied pseudo-random sequence estimating...

In this paper a methodology for the characterization of cyclostationary sources based on near-field time-domain measurements is proposed. The theory scanning over equivalent Huygens' surface in parallel to object plane PCB presented. theoretical background properties and random processes given. space-time distributions Huygens Intel Galileo Board experimentally determined.

A two dimensional localization algorithm for stochastic EMI sources based on time domain measurements of electromagnetic near-field tangential components is presented. The autocorrelation and cross-correlation functions obtained by using the two-point planar scanning system are used characterization field distribution. simulation experimental data processed a spatial equivalent point sources. estimated distributions patterns

The near-field measurements of the stochastic fields radiating by digital electronic devices can be used for localization electromagnetic interference (EMI) sources on surface device under test. characterization space distribution wide sense cyclostationary (WSCS) field in observation plane accomplished a cross correlation between reference and all remaining knots. proposed Tikhonov regularization algorithm conjunction with L-curve method provides stable inverse reconstruction multi-dipole...

Coupling and Emissions Under Cyclostationary

Crosstalk is an undesirable factor that degrades the quality of data transmission in printed circuit boards (PCBs). The signal integrity (SI) multiconductor lines controlled by using a large number multiport tests and measurements, which require lot time expensive laboratory equipment. Proposed processing methods based on blind identification allow reduction measurement burden. Contrary to traditional approach requiring knowledge sampling offset, input pseudorandom bit sequence (PRBS), delay...

In this paper the analytical time-domain propagator based on Jefimenko's equations was applied to evaluation of stochastic electromagnetic field characteristics. It is shown that near-field spatial distribution cross-correlation function (CCF) obtained by two-point measurement system can be efficiently used for prediction far-field statistical characteristics printed circuit board (PCB) radiated emission. The proposed approach has been validated antenna measurements.

The wideband coherent-pulse radar provides high-resolution image of the target. model this is a complex envelope superposition corresponding to signals diffracted by point scatterers. values envelopes are distributed over coordinate plane in accordance with scatterer positions and their reflection coefficients. consists range Doppler profiles. parameters target scatterers were defined processing two-dimensional (2D) data extracted from 2D discrete Fourier transforms image. proposed...

The blind separation of the cyclostationary signals using a single channel measurement in transmission line is proposed. waveform identification partial pulse responses evaluated for additively mixed sources data, inter-symbol interference and crosstalk. A matrix model composed random vectors considered. proposed estimation procedure based on pre-processing principal component analysis measured data by digital oscilloscope following independent analysis. allows diagnostics signal integrity...

Estimation of statistical characteristics for radiated electromagnetic emissions caused by PCB can be implemented signal processing time domain signals measured near-field scanning system. The relation between the source and probe at each point modelled an impulse response describing linear transformation signal. In this paper modeling procedure to far-field propagator based on Jefimenko's equations is presented. Synchronized responses used computer aid prediction spatial-time evolution...

In this paper a crosstalk between two neighboring transmission lines induced by the electromagnetic interference emitted signals transmitting along microstrip is investigated. The quantitative characterization of mutual interaction was evaluated reduction eye opening defining bit error ratio (BER) communication link. random signal extracted from data transferring sequence measured real time digital oscilloscope qualifies jitter link and processed as cyclostationary stochastic process. cyclic...

Measurement techniques of stochastic electromagnetic emissions in the near-field PCB can be realized time domain by sensing transient with a scanning system equipped two probes and real digital oscilloscope. Radiated interference originating from circuitry exhibits properties cyclostationarity caused random bit sequence travelling along line over surface PCB. The relation between source signal signals measured probe at each point was modelled an impulse response describing linear...

The electromagnetic field (EMF) emitted unintentionally by the printed circuit board (PCB) of an electronic device may cause interference to other devices in vicinity PCB and thus, degrade their performance. radiated EMF is stochastic nature usually contains cyclostationary components due data transferred between separate blocks along surface [1], [2]. Cyclostationarity occur some regular processes intrinsic operating mode device. For example, could be programmed for sending several digital...

In this paper a 2D stochastic EMI sources identification algorithm based on two-point time-domain scanning of electromagnetic near-field tangential components is presented. The radiating structure considered as set simple electrical dipoles arranged grid in object plane. autocorrelation and cross-correlation spectra are used for the characterization field distribution. These characteristics to determine distribution dipole moments estimate parameters real radiation sources. Typical cases...

The paper suggests combining the inverse filtering and parametric identification in post-processing sequence of complex radar image. image can be modeled assuming superposition identical partial responses from effective target point-scatterers. Their positions correspond to geometrical profile coordinate plane. proposed algorithm consists non-parametric procedures which are used improve resolution identify form target. presented simulated results illustrate main steps post-processing.

Theoretical and experimental evaluation of the crosstalk between transmission lines printed circuit boards (PCB) induced by electromagnetic interference emitted random signals with cyclostationary properties are presented. The quantitative analysis two adjacent was evaluated bit error ratio (BER) communication link. signal measured real time digital oscilloscope characterized as a stochastic process. cyclic averaging reveals instantaneous periodic power corresponding to variance probability...

The densely integrated electronic devices require ultra-low level of the bit error rate (BER). A huge number experiments provides BER estimation using statistical signal processing in multi-conductor transmission lines. In this paper probabilistic model combined victim and crosstalk voltage is presented. proposed approach allows to estimate characteristics different trajectories measured signals experimental investigation BERs for rates performed.