Browsing 2018/4 by Issue Date
Now showing items 21-37 of 37
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Phase Quantized Metasurface Reflectors for X-band Laguerre Gaussian Vortex Beam Generation
(Společnost pro radioelektronické inženýrství, 2018-12)From last two decade, there is an exponential growth in consumption of available bandwidth in the radio frequency spectrum. To challenge this issue, improvement in channel capacity is getting huge research attention. ... -
Dual-Band Compact Metamaterial-Inspired Absorber with Wide Incidence Angle and Polarization Insensitivity for GSM and ISM Band Applications
(Společnost pro radioelektronické inženýrství, 2018-12)A dual-band metamaterial inspired microwave absorber composed of concentric two crossed double-arrow shaped resonators, ring resonator with four splits at the corners and square ring resonator is presented. The proposed ... -
Super High-Selectivity Fifth-Order Bandpass Filter with Twelve Transmission Zeros
(Společnost pro radioelektronické inženýrství, 2018-12)A fifth-order bandpass filter (BPF) with super high selectivity using three pairs of coupled lines and two open stubs is proposed. Twelve transmission zeros (TZs) from 0 to 2f_0 (f_0 denotes center frequency of the passband) ... -
A Compact Dual-Band Negative Group Delay Microwave Circuit
(Společnost pro radioelektronické inženýrství, 2018-12)A compact dual-band negative group delay circuit (NGDC) is proposed. The proposed NGDC is composed of an open-circuited transmission line and two resistors connected by two transmission lines. The frequency ratio is ... -
Efficient Procedure Improving Precision of High Conditioned Matrices in Electronic Circuits Analysis
(Společnost pro radioelektronické inženýrství, 2018-12)In this article, we propose several improvements that could be done to SPICE simulator. The first is based on a functional implementation of device models. The advantages of functional implementation are demonstrated on ... -
About Edge Detection in Digital Images
(Společnost pro radioelektronické inženýrství, 2018-12)Edge detection is one of the most commonly used procedures in digital image processing. In the last 30-40 years, many methods and algorithms for edge detection have been proposed. This article presents an overview of edge ... -
Single and Dual-GPU Generalized Sparse Eigenvalue Solvers for Finding a Few Low-Order Resonances of a Microwave Cavity Using the Finite-Element Method
(Společnost pro radioelektronické inženýrství, 2018-12)This paper presents two fast generalized eigenvalue solvers for sparse symmetric matrices that arise when electromagnetic cavity resonances are investigated using the higher-order finite element method (FEM). To find a few ... -
Robust Hybrid Algorithm of PSO and SOCP for Grating Lobe Suppression and against Array Manifold Mismatch
(Společnost pro radioelektronické inženýrství, 2018-12)Based on Particle Swarm Optimization (PSO) and Second-Order Cone Programming (SOCP) algorithm, this paper proposes a hybrid optimization method to suppress the grating lobes of sparse arrays and improve the robustness of ... -
FBMC Transmitters with Reduced Complexity
(Společnost pro radioelektronické inženýrství, 2018-12)Filter Bank MultiCarrier (FBMC) modulation is currently considered as one of the key enablers for future 5G technologies. In the literature, two approaches are applied for the modulation of FBMC signals: Frequency Spreading ... -
Evaluation of EEG-based Complementary Features for Assessment of Visual Discomfort based on Stable Depth Perception Time
(Společnost pro radioelektronické inženýrství, 2018-12)The investigation aimed at the evaluation of EEG activity during stereoscopic perception of images with different levels of visual comfort. Different levels of disparity and the number of details in stereoscopic views in ... -
An Unambiguous Tracking Technique for Cosine-Phased BOC Signals with Low Complexity
(Společnost pro radioelektronické inženýrství, 2018-12)A low-complexity unambiguous tracking method for cosine-phased binary offset carrier (BOCc) signals is proposed in this paper. The proposed method directly constructs a code discriminator function by multiplying two ... -
PD Source Location Utilizing Acoustic TDOA Signals in Power Transformer by Fuzzy Adaptive Particle Swarm Optimization
(Společnost pro radioelektronické inženýrství, 2018-12)Acoustic Emission Partial discharge (AEPD) Location is one of the techniques utilized by many transformer manufacturers and power utility engineers in routine and critical situation for optimal operation of the electrical ... -
Chained-Function Filter Synthesis Based on the Modified Jacobi Polynomials
(Společnost pro radioelektronické inženýrství, 2018-12)A new class of filter functions with pass-band ripple which derives its origin from a method of determining the chained function lowpass filters described by Guglielmi and Connor is introduced. The closed form expressions ... -
Bit Error Probability of M-QAM under Impulsive Noise and Fading Modeled by Markov Chains
(Společnost pro radioelektronické inženýrství, 2018-12)This article presents new exact expressions, written in terms of elementary transcendental functions, for calculating the bit error probability of M-ary Quadrature Amplitude Modulation (M-QAM) scheme considering the wireless ... -
The DVB-T-Based Positioning System and Single Frequency Network Offset Estimation
(Společnost pro radioelektronické inženýrství, 2018-12)As position information becomes more and more important in many fields of technology it is advantageous to recognize it in scenarios where satellite-based systems fail. Such a case is the scenario inside buildings where ... -
Determination of Base Station Emission Power Change in a Mobile Network Cell with Movable Users
(Společnost pro radioelektronické inženýrství, 2018-12)This paper considers base transceiver station (BTS) emission power change in the cell-organized mobile network with dynamic power control, due to users’ moving. Such power adjustment contributes to energy saving and ... -
Generalized Roughness Bearing Faults Diagnosis Based on Induction Motor Stator Current
(Společnost pro radioelektronické inženýrství, 2018-12)Despite their reliability, induction motors tend to fail. Around 41% of faults in motors are bearing related and that is the most common fault in motor field. Due to the lack of research on generalized roughness bearing ...