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With rapid growth of wireless local area networks (WLAN) and computing techniques, handheld devices have become a popular tool in terms of working, entertaining and communicating in daily life. Considering the huge amounts of messages travelling in WLAN, a secure authentication scheme is definitely necessary, which is also required to be flexible across multiple organizations. Aiming for establishing...
When the use of mobile devices is soaring, the demand for higher data rates over wireless networks is continuously increasing. To meet the demand, one of the obvious solutions is to increase the bandwidth of the transmission frequency band. However, no matter how much you are willing to pay for the spectrum, you can no longer easily obtain a large contiguous bandwidth because most spectrum bands have...
A broadband dual-polarized planar antenna element for mobile communication base station is presented in this paper. It is formed by two crossed modified dipoles printed on a substrate and supported upon a reflector by four nylon posts. Simulated and measured bandwidth with VSWR<1.4 are 49% (1.68-2.77 GHz) and 57% (1.63-2.93 GHz), respectively, within which the polarized isolation is better than...
This paper presents a digitally-controlled highly efficient supply modulator. This supply modulator is implemented as a multilevel converter in series with a linear amplifier. The multilevel converter output which controlled by digital signals is employed to supply the linear amplifier. The digitally controlled strategy and the optimization of the supply levels can make the converter output to approach...
A dual-band bandpass filter using a transversal-interference multimode resonator is proposed. The resonator is composed of a flatten ring resonator attached with two open-circuited stubs. By properly selecting the connecting position between the stubs and a ring, the two pairs of resonant modes can be grouped to make up the dual-passband response, and they can be further separated with virtue of two...
This paper presents the design of compact low-loss bandpass filter using the proposed hybrid resonator. The hybrid resonator is composed of a microstrip line and a short-circuit coaxial line. The proposed hybrid resonator configuration provides the advantages such as high Q-factor, small size, light weight, integration with other printed circuits such as power amplifier, low noise amplifier, mixer...
This paper presented a frequency doubling two-path phased-array FMCW radar transceiver in 65nm CMOS process. The FMCW signal is generated by a fractional-N PLL. The frequency doubling scheme can lower down the frequency of the PLL, reduce the required phase shifting range of phase shifter and the design complexity of the LO distributed network. The FMCW chirp bandwidth is 1.93 GHz from 76.92 to 78...
This paper proposes a recurrent fuzzy neural network (RFNN) for speech detection. The underlying notion of the proposed RFNN is to consider minimum classification error (MCE) and minimum training error (MTE). The weights of RFNN are updated by maximizing the discrimination among different classes in MCE. Besides, the parameter learning adopts the gradient descent method to reduce the cost function...
A compressive sensing based bistatic MIMO radar is proposed for joint direction of departure (DOD), direction of arrival (DOA) and Doppler frequency estimation, where random arrays are employed and the intervals between adjacent pulses are chosen randomly. A discretization mechanism for DOD- DOA-Doppler space is established. Under such a sparse framework, the least amount of random measurements required...
Feature classification plays an important role in computer-aided diagnosis (CADx) of suspicious lesions. While many texture features have been extracted and applied for various clinical purposes, Haralick's feature extraction method is of great interest, because it gives a series of texture measures on the image intensity correlations among the image pixels across an image slice. Based on the Haralick's...
High Efficiency Video Coding (HEVC) standard employs Coding Tree Unit (CTU) quadtree partition technology to improve the compression efficiency significantly, but it also consumes an enormous encoding computational complexity. In this paper, a fast CTU depth prediction algorithm is proposed. First, the spatio-temporal correlation of CTU depths among the current CTU, the spatial neighbor CTUs, and...
Calibration is an important task in large field vision metrology. With the increase of detection range, some issues arise, such as low accuracy, excessive size of calibration target, complex operation and large computation. To address these weaknesses, a new calibration method based on two steps is presented. It is adjustment of the cameras and field calibration. The first step is to make the epipolar...
This paper presents a projection based on the true three-dimensional imaging display system. The system employs self-made high-speed rotating screen projector in the projection point as a unit consisting of voxel point light field. We discussed of true three-dimensional image display system imaging space construction, and also proposed a light emitting structure of the new method of volume pixels,...
This paper proposes a new application of power amplifiers linearization technology for concurrent Dual-band differing in power. A Broadband power amplifier is used to verify proposed application. The dual 20MHz band spacing 200MHz are test at the carrier frequency of 2.3GHz and 2.5GHz. And the dual-band's power have more than 10dB difference. When the difference is 15dB, the simplified model can achieve...
This paper presents the simulation and design of a dual polarized electrically adjustable array antenna with broadband element for mobile communication base station. The antenna array works from 1710 MHz to 2690 MHz which covers DCS/PCS/3G and LTE bands. By choosing the fed network and optimizing the fed phase of each element with the Genetic Algorithm, a perfect shaped-beam radiation pattern is obtained...
A novel wideband bandpass filter using back-to-back microstrip-slotline transition and triple-mode slotline resonator is proposed. The triple-mode resonator is constructed with one full-wavelength slotline ring and a single short-circuited stub. Two microstrip feed lines are placed above the slotline in such a way that two intersection positions are placed at the 54° separation along the ring. With...
Since fuzzy neural networks (FNN) have been successfully applied to classification problems, this paper proposes a principal component analysis (PCA) and linear discriminant analysis (LDA) based FNN to achieve the image classification. In PCA, it can convert a set of observations into a set of linearly uncorrelated variables called principal components. In LDA, the weights are updated by seeking directions...
Ideas creation is an important activity in various scenarios while research is one of them. A considerable number of research studies have been made in the past years in improving tools and methods to support idea generation. However, creativity of ideas has only been studied in sporadic attempts, and most of them only share little similarity in conditions. Moreover, since knowledge is the basis of...
This paper studies the leader-following consensus of multi-agent systems with general linear continuous-time models and switching topologies via event-based control technique. This topic arises naturally in real multi-agent systems with limited on-board resources. For each agent, the triggering function is defined to determine the triggering time instants and the controller updates are event-based,...
Service computing technologies have been widely applied to many application domains to facilitate rapid system integration for desired goals. However, existing service models need to be enhanced for cyber-physical systems (CPS) and internet-of-things (IoT). In this paper, we develop an ontology model for the specification of services in CPS/IoT. First, we discuss the major differences in modeling...
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