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This paper proposes a method to detect photon counts from a commercial off-the-shelf SPAD array. Experiments show that using this method the sensitivity of a VLC receiver that incorporates this SPAD array approaches the limit set by Poisson noise.
We demonstrate the development, performance and application of a GaN-based micro-light emitting diode array sharing a common p-electrode with individual-addressed n-electrodes. These individually-addressed n-electrodes minimize the series-resistance difference from conductive paths, and offer compatibility with n-type metal-oxide-semiconductor transistor-based drivers for faster modulation.
In this paper method of location determination is proposed for objects that are sources of sound. Authors propose to use beamforming algorithms on data from Microphone arrays and neural-network algorithms for determining the similarity of the results with the typical sound of a given object for this purpose.
Characterization of coherence tuning range for 2×1 photonic crystal VCSEL arrays under pulsed excitation is reported. Far field data show the coherence range is larger under pulsed conditions compared to cw operation due to reduction of resistive diode heating.
High-power, high-linearity CC-MUTC photodiodes, directly integrated into connected and tightly coupled array antennas enable ultra-wideband (UWB) phased array operation with improved size, weight, and power (SWaP). Presented is high-fidelity beam steering and bandwidth performance of several of these one-dimensional photodiode-integrated antenna arrays.
This work explores integrating sparse recovery methods into the ray space transform. Sparse recovery methods have proven useful in microphone array analysis of sound fields. In particular, they can provide extremely accurate estimates of source direction in the presences of multiple, simultaneous sources and noise. The ray space transform has recently emerged as a useful tool to analyse sound fields,...
Surveillance tasks, both in the public security and in the military domains, exploit sensors and sensor networks with complementary functionalities. Systems with an integrated multisensory suite benefit from the complementarity of the sensed data types. Capability gaps can indeed be reduced and an enhanced profile of the Area of Interest (AoI) can be retrieved. Although a diversified selection of...
Structural health monitoring plays an important role in protecting civil infrastructures. Smart film bionic monitoring method and video image monitoring method have advantages of high speed and perceptual intuition, so they have been well applied in structural health monitoring. However, the two methods are difficult in detecting structural stress condition and limited in some monitoring aspects....
The emergence of large-scale dynamic sets in real applications creates stringent requirements for approximate set representation structures: 1) the capacity of the set representation structures should support flexibly extending or reducing to cope with dynamically changing of set size; 2) the set representation structures should support reliable delete operation. Existing techniques for approximate...
In this paper we propose a method for the localization of acoustic sources using small microphone arrays randomly placed in the acoustic scene. The presented approach is based on a ray-based plane wave decomposition performed locally on each microphone array followed by a fusion of the obtained results in order to build a sound field representation that is convenient for the localization of acoustic...
Performance modeling plays an important role for optimal hardware design and optimized application implementation. This paper presents a very low overhead performance model, called VLAG, to approximate the data localities exploited by GPU kernels. VLAG receives source code-level information to estimate per memory-access instruction, per data array, and per kernel localities within GPU kernels. VLAG...
Owing to the advantages of low standby power and high scalability, ReRAM technology is considered as a promising replacement for conventional DRAM in future manycore systems. In order to make ReRAM highly scalable, the memory array has to have a crossbar array structure, which needs a specific access mechanism for activating a row of memory when reading/writing a data block from/to it. This type of...
Synthetic aperture sonar has the characteristics of high resolution imaging which is not limited by the detection range. It can be used for imaging and mapping of the seafloor. However, the product value of detection range and speed of navigation is limited by the physical length of the array in the traditional synthetic aperture sonar. When the speed of navigation is improved on condition that the...
The enumeration of all maximal cliques in an undirected graph is a fundamental problem arising in several research areas. We consider maximal clique enumeration on shared-memory, multi-core architectures and introduce an approach consisting entirely of data-parallel operations, in an effort to achieve efficient and portable performance across different architectures. We study the performance of the...
The objective of this paper is to describe a least square method to compute the far field from a nonuniformly spaced antenna array. This is because the far field pattern of an antenna array is the Fourier transform of the current distribution developed on the antenna structure, This is equivalent to computing the spectrum from a nonuniformly spaced data set using a least squares method. The merit...
Combining of nonlocal means and variational models can extend the ability of image processing such as texture image processing. In this paper, an implementation scheme of nonlocal variational models is proposed, which contains discretization, coordinate transformation, and dimension expansion. Firstly, continuous models are transferred to discrete model. Then we transform absolute coordinate to relative...
Sequent data acquisition and imaging in traditional active millimeter-wave imaging system in market results in serious time delay, cost, and system complexity. A point-by-point imaging approach is proposed in this paper to address the issue. Imaging starts shortly after data acquisition begins and virtually simultaneously with data acquisition. Partially known image and new data are used to image...
A new combined REV calibration method for large phased array antenna is presented in this paper. This method is based on power measurement, so the measurement can reach a high stability in high frequency. It can also improve the calibration accuracy and efficiency at the same time, especially in large phased array antenna. Simulation results testify the correctness of this new method.
An active millimeter wave imaging system with sparse antenna array for security inspection is introduced in this review. Several key parts and related techniques of the imaging system are explained and numerical results are provided.
Design of a control module for millimeter wave imaging system based on FPGA is presented in this paper. There are four parts in the module: scanning control module of antenna array, data acquisition and storage control module, ethernet transmission control module and mechanical scanning platform control module.
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