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Power consumption is a key issue for wireless network design. Cooperative routing, an efficient scheme for saving transmission power in wireless networks, combines the advantage of the cooperative communication in the physical layer and the routing technology in the network layer. In this paper, we propose a distributed minimum power cooperative routing algorithm based on optimal power allocation,...
The chiller system in a building accounts for the main part of the building's total energy consumption, so it is critical to optimize the operation of chiller system for the purpose of saving energy. A chiller system generally consists of evaporation side and condensing side. The condensing side includes chillers, cooling water pumps and cooling towers, which form a subsystem of cooling water. It...
This paper introduces a dual-band dual-mode button antenna for body centric communications. Integrated on the clothes, the proposed antenna has a miniaturized flexible ground. By employing PIFA and its higher order mode, an omnidirectional pattern and a broad-side directional pattern for on-body and off-body communications are realized at lower and upper bands, respectively. With a flexible ground,...
This paper presents a novel compact planar filtering crossover. Such co-design circuit is equal to one conventional crossover plus two bandpass filters, which can realize circuit miniaturization. Moreover, the resonator is shared by the two transmission paths while they are isolated with each other. Thus, compactness is obtained. For validation, the filtering crossover is implemented with each path...
A broadband, low profile and high gain filtering dielectric resonator antenna (DRA) is investigated in this paper. Four resonant modes are simultaneously excited in the DRA to provide a broad bandwidth of 59.6% and an average gain of 9.42 dBi within passband, while a shorting via and two pairs of transverse stubs are introduced into the feeding mircostrip line to generate radiation nulls in stopband...
In this paper, a dual-element MIMO antenna without adding any decoupling structure is presented. The MIMO antenna consists of two symmetric inverted-L elements with the antenna spacing of only 9 mm (0.1 λ at 3.5 GHz). The isolation between antennas is reduced by pattern diversity. |S11| < −10 dB and |S21| < −16 dB are achieved over the band from 3.48–3.6 GHz. Compared with the antenna without...
ISAR imaging of high speed moving target has drawn extensive attention for its practical applications. However, the imaging quality is affected significantly by the phase modulation induced by high speed motion. To suppress the influences of high speed motion efficiently, a novel ISAR imaging method for high speed moving target based on the parametric sparse representation is proposed. First, the...
Aiming at the problem of composite anomaly detection and health monitoring, the improved twin support vector machine(TWSVM) with kernel principle component analysis(KPCA) is applied to aircraft composite health monitoring. Firstly, model of uniplanar multi-electrodes was partitioned into equal area units with FEM so that data was acquired enough. Secondly, KPCA was used to select the dimension of...
Target recognition based on forward-looking imaging has many potential applications. However, the conventional algorithms fail to locate targets accurately due to the low resolution of forward-looking radar images. Meanwhile, the conventional algorithms always suffer from high computational complexity and cannot satisfy the requirement of real-time processing for high-speed platform. This paper proposes...
This paper describes a new technique for generating bistatic sea clutter returns based on the compound K-distribution model for clutter amplitude statistics. The technique adopts the computational electromagnetic (CEM) method to calculate bistatic sea clutter reflectivity by the given bistatic geometrical relationship, aiming at obtaining the parameters of the distribution. Then the theory of spherically...
High cross-range resolution of forward-looking region is the key problem of radar imaging. This paper presents a multi-beam system to extend high resolution imaging domain based on the digital beamforming (DBF) technique. The Doppler bandwidth is increased in forward-looking direction while the symmetrical Doppler domain could be significant reduced. Then matched filter technique is employed to deal...
Recognizing the category attributes from the real world targets is one of the most challenging and attractive fields in synthetic aperture radar (SAR) application. It is an important issue to explore the spatial distribution characteristics of multi-aspect angle imagery in synthetic aperture radar automatic target recognition (SAR ATR). In this paper, we will research the spatial structure of multi-aspect...
The low angular resolution of scanning radar limits the application in the forward-looking imaging field. This paper proposes the mixed method of truncated singular value decomposition (TSVD) with regularization l1 norm to achieve the angular super-resolution. First, the TSVD technique is applied to suppress the noise amplification and keep the main information of targets. Then the angular super-resolution...
Surge is one of the main dynamic instabilities that limites the operation of centrifugal compressors. In order to avoid disastrous consequences caused by the surge and control the surge actively, a rapid surge detection technology is required. In this paper, a novel surge detection method based on the magnetically suspended centrifugal compressor (MSCC) using adaptive notch filter is proposed, and...
This paper concerns the design of classifiers for medical decision making, and proposes a novel probabilistic neural network classifier with the assistance of a genetic algorithm. Unlike the conventional probabilistic neural networks that use all patterns in data sets as hidden nodes, the proposed neural network adopts some centers through clustering algorithms and the output of data set as the hidden...
In this paper, by analyzing the relationship between rotor position and phase back electromotive forces (PB-EMFs) of brushless DC motor (BLDCM), a novel rotor position detection method based on morphological filter algorithm (MFA) for BLDCM is proposed. MFA is applied to identify the signal turning points (STPs) of the input stator PB-EMFs, which provides technical support for the current commutations...
Wireless power transmission (WPT) is a promising technology that can be employed as an alternative power source for electronic circuits. Actually, the receiving power generally cannot remain constant due to different transmission environment and distance. The variation of the input power levels leads to the diode impedance change, and then causes impedance mismatch and rectifier performance degradation...
In this paper, a compact in-phase power divider integrated with bandpass responses in low temperature co-fired ceramic (LTCC) technology is presented. The proposed device is composed of three coupled half-wavelength resonators and an isolation resistor. Among them, one resonator acts as the common resonator and is symmetrically coupled to the other two using multiple broadside coupling. In this way,...
The poor azimuth resolution limits the application of the scanning radar. Several super-resolution methods have been proposed to improve the angular resolution. However, they suffer from noise amplification and edge loss. In this paper, a novel angular super-resolution approach for scanning radar is presented. Firstly, the angular super-resolution problem is converted into an inverse problem, which...
This paper proposes a Doppler beam sharpening (DBS) imaging method to achieve the high azimuth resolution in the forward-squint region based on fast iterative adaptive approach (F-IAA). In conventional DBS imaging, fast Fourier transform (FFT) method is adopted to obtain the estimation of Doppler center frequencies of targets, but it suffers from the low resolution and high sidelobes. Though a weighted...
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