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In this paper, we present an evaluation of two forward error correction (FEC) codes, Hamming codes and Reed-Solomon codes, used in the tag communications within the ISO 18000-63 (Gen2) passive Radio Frequency Identification (RFID) tag identification protocol. Gen2 tags utilize backscatter communication, and their communication signal is often −60dBm or lower when it reaches the reader. Signals at...
In this paper, we study the problem of mining frequent sequences under the rigorous differential privacy model. We explore the possibility of designing a differentially private frequent sequence mining (FSM) algorithm which can achieve both high data utility and a high degree of privacy. We found, in differentially private FSM, the amount of required noise is proportionate to the number of candidate...
This paper presents a sub-1V dynamic comparator with cross-coupled latches at multi-GHz operation. The low-voltage cross-coupled latches structure with a separated tail current can be used to optimize the speed and the offset in the latched stage, respectively. A high speed readout circuit is also proposed to further enhance the speed of the comparator. With BER=109, the comparator achieves 143fJ...
A new class of low sensitivity and efficient decimation filters based on the polyphase decomposition of IIR transfer functions is proposed. Comparisons with conventional IIR elliptic filters are presented. An illustrative example for application in passive sonar systems using real noisy data is provided.
The Virtual Reference Feedback Tuning (VRFT) is a data based method for the design of feedback controllers; it has been presented by the same authors in previous work. In the original formulation the VRFT method gives a solution to the one degree of freedom model-reference control problem in which the objective is to shape the I/O transfer function of the designed control system. This paper delivers...
New synthesis techniques for the design of Robust Fault Detection and Isolation (RFDI) filters are developed. The approach provides techniques for designing filters that maximise sensitivity, in some sense, to the effects of faults on the residual signal, while guaranteeing the robustness to noise, disturbances and modelling errors. The design procedure is iterative and is based on robust H∞ estimation...
We present in this paper a Blind Source Separation (BSS) application to the separation of metal objects located inside the ground. We first describe a smart sensor based on the eddy currents and its application to the identification of metal tags. This system is sensitive to the presence of metal objects near the metal tag which can alter the sensor response. We show how using the BSS techniques permit...
The problem of finite word length implementation is discussed in this paper. Alternatively to the ρDFIIt recently proposed by G. Li et al., and leaning on the specialized implicit form for a unified analysis, a new effective and sparse structure, named ρ-modal realization, is developed. This realization meets simultaneously accuracy (low sensitivity, round-off noise gain and overflow risk), few and...
The detection and analysis of retinal vessels in ophthalmology is of great use in the diagnosis and progression monitoring of diabetic retinopathy. Automatic Detection of the vessel network has however been challenging due to noise from uneven contrast and illumination during the retinal image acquisition process. This paper presents a robust segmentation technique that combines phase congruence and...
In compressed sensing, the l1-constrained minimal singular value (l1-CMSV) of an encoder is used for analyzing (theoretically) the robustness of decoders against noise. In this paper, we show that for random encoders, the square of the l1-CMSV (S-CMSV) is a random variable. And, for the Gaussian encoders, the S-CMSV admits a simple, closed-form probability and a cumulative distribution functions....
Ice desorption is the main mechanism causing the release of complex molecules from the solid to the gas phase in star forming regions. A Schottky diode millimetre-wave heterodyne radiometer, developed by the Millimetre-Wave Technology Group, RAL Space, UK, has been used for laboratory-based analysis of interstellar ice analogues. The sensitivity and stability of the instrument has been characterised...
In this paper, we propose the directional local mean difference level set method (DLMD-LS). Our work is focused on the segmentation for a urinary bladder lumen in a T2 weighted image taken during brachytherapy. The boundary is detected as the region where the intensity means of the areas inside and outside the zero-level contour (edge) are high. The contour is controlled such that it stops evolving...
Recommender systems become increasingly popular and widely applied nowadays. The release of users' private data is required to provide users accurate recommendations, yet this has been shown to put users at risk. Unfortunately, existing privacy-preserving methods are either developed under trusted server settings with impractical private recommender systems or lack of strong privacy guarantees. In...
We introduce a new family of quality indices that are based on the reported findings that biological visual systems exhibit interference in spatial harmonic distortion, and that local phase distortion is more perceived than global phase distortion. This paper specifically addresses a full-reference version of the proposed indices. The proposed quality index has three components: harmonic chaos analysis,...
Next generation coherent optical communication systems can potentially employ new architectures such as colorless, filterless, gridless and highly-sensitive features. This paper discusses and demonstrates advanced receiver design that is targeted for such applications.
This paper proposes a new compensation technique to reduce the clock jitter effects for the continuous-time sigma-delta (CT-ΣΔ) modulator by using divided-by-n (D-N) feedback DAC waveform. There are two types of clock jitter: independent clock jitter (random jitter) and accumulated clock jitter (deterministic jitter). This technique provides a useful approach to solve one of the critical non-idealities,...
The occurrence of DC Bias will affect the normal operation of power transformer, thus DC bias withstand capability of transformer is a prerequisite for stable operation of power system. In this paper, the DC current distribution model of transformer neutral point in Yichang area is established. Meanwhile, according to the transformer noise limit, the maximum current which is allowable to flow through...
The MWR instrument builds, together with the SRAL altimeter, the Sentinel-3 (S3) topography mission in the frame of the EC Copernicus program. The MWR provides information for tropospheric path correction of SRAL measurements, and its data can also be used for determining surface emissivity and soil moisture over land, for surface energy budget investigations and ice characterization. The MWR is a...
LPI/LPD (Low Probability of Intercept/Low Probability of Detection) analyses typically follow the original work of Urkowitz [1] to obtain probability of detection for a specified false alarm rate. Such analyses are based on a uniform time invariant noise background. However, when the noise background is not uniform, the detection performance is significantly reduced. The resulting loss in detection...
Helicopter flight control law design including rotor state feedback is considered and an approach based on structured H∞ control, capable of guaranteeing stability and performance robustness, is proposed. The framework also encompasses fault tolerance with respect to failures of the rotor state sensors. Simulation results comparing the proposed approach to results from the literature are presented...
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