Browsing 2021/3 by Title
Now showing items 1-16 of 16
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2D Angularly Dependent Array Error Calibration for 1D Array via Neural Network with Local Manifold Interpolation
(Společnost pro radioelektronické inženýrství, 2021-09)The calibration of the angularly dependent array error is a challenging task for signal processing. In this paper, we propose a neural network (NN)-based two-dimensional (2D) calibration method for a linear array. Firstly, ... -
A Comparison of Papoulis and Chebyshev Filters in the Continuous Time Domain
(Společnost pro radioelektronické inženýrství, 2021-09)The subject of this paper is the revisit of the Chebyshev (equiripple) and Papoulis (monotonic or staircase) low-pass filter in order to compare. It can be stated the fair comparison of Papoulis and Chebyshev filters cannot ... -
Design of a Linearly Polarized HMSIW U-Slot Antenna
(Společnost pro radioelektronické inženýrství, 2021-09)In this paper, a characteristic modal analysis and a design guide of a linearly polarized HMSIW U-slot antenna is proposed. The presented characteristic modal analysis of the antenna explains its multi-modal behavior in ... -
Dynamic and Sparsity Adaptive Compressed Sensing Based Active User Detection and Channel Estimation of Uplink Grant-Free SCMA
(Společnost pro radioelektronické inženýrství, 2021-09)In uplink (UL) grant-free sparse code multiple access (SCMA) systems, unlike the conventional contention-based transmission, users' activities should be known before data decoding due to sporadic transmission in massive ... -
An Exponential Filtering Based Inversion Method for Microwave Imaging
(Společnost pro radioelektronické inženýrství, 2021-09)In this paper, a new methodology based on the exponential filtering of singular values is adopted to solve the linear ill-posed problem of microwave imaging. This technique filters out the insignificant singular values and ... -
Grouping Parallel Detection Method of UAV Based on Multi Features of Image Transmission Signal
(Společnost pro radioelektronické inženýrství, 2021-09)The emergence of low, slow, and small civilian unmanned aerial vehicles (UAV) brings fun and convenience to life and work. However, with the widespread popularity of UAV, the illegal activities caused by them have gradually ... -
High-Selectivity Bandpass Filter Based on Two Merged Ring Resonators
(Společnost pro radioelektronické inženýrství, 2021-09)A high-selectivity bandpass filter (BPF) based on two merged ring resonators is presented in this paper. The structure of this proposed BPF can be seen as the two one-wavelength ring resonators merged each other by sharing ... -
High-Selectivity Reflectionless Unbalanced-to-Balanced Filtering Power Combiner
(Společnost pro radioelektronické inženýrství, 2021-09)A high-selectivity reflectionless unbalanced-to-balanced (UTB) filtering power combiner is proposed. The proposed power combiner composes of two absorbing branches, two filtering sections, two transmission lines, a grounded ... -
An Improved Multiple-Toeplitz Matrices Reconstruction Algorithm for DOA Estimation of Coherent Signals
(Společnost pro radioelektronické inženýrství, 2021-09)The Toeplitz matrix reconstruction algorithms exploit the row vector of an array output covariance matrix to reconstruct Toeplitz matrix, which provide the direction-of-arrival (DOA) estimation of coherent signals. However, ... -
Investigation on In-band Interference Effect and Out-of-band Interference Mechanism of B1I Navigation Receiver
(Společnost pro radioelektronické inženýrství, 2021-09)Aiming at the problem that the Beidou B1I navi¬gation receiver is susceptible to continuous-wave interfer¬ence (CWI), it is of great significance to investigate the interference effect and mechanism of the B1I navigation ... -
Linear and Non-Linear Synthesis of Unequally Spaced Time-Modulated Linear Arrays Using Evolutionary Algorithms
(Společnost pro radioelektronické inženýrství, 2021-09)A novel method of designing unequally spaced time-modulated arrays (UESTMAs) by handling fewer optimization parameters with reduced problem dimension is presented in this paper. For synthesizing UESTMA, two design parameters, ... -
Nested Tail-Biting Convolutional Codes Construction for Short Packet Communications
(Společnost pro radioelektronické inženýrství, 2021-09)Tail-biting convolutional codes (TBCCs) have become a research hotspot in the short-block-length regime due to the growing interest in strong short packet com-munications with low latency and ultra-reliability. TBCCs can ... -
Photonic Approach to Phased Array Application
(Společnost pro radioelektronické inženýrství, 2021-09)Many applications, including phased array antennas, require a significant and tunable time delay, which pure electrical methods cannot establish. A variable microwave true-time delay line utilizing a photonic approach is ... -
Radio Frequency Identification Sensing Chipless Tag for Permittivity Monitoring of Specific Sizes Materials
(Společnost pro radioelektronické inženýrství, 2021-09)In this paper, a novel Radio Frequency Identification chipless tag for permittivity sensing characterized by a reduced size, an original shape and a low manufacturing cost is presented. The tag consists of a linear shape ... -
Research on Test Method of Ignition Temperature of Electric Explosive Device under Electromagnetic Pulse
(Společnost pro radioelektronické inženýrství, 2021-09)The safety and reliability of electric explosive device, as the most sensitive initiating energy for igniting powder and explosive, directly impact those of weapon system. The safety and reliability of the electric explosion ... -
Substrate Integrated Waveguide Cavity Backed Wideband Slot Antenna for 5G Applications
(Společnost pro radioelektronické inženýrství, 2021-09)In this article, a study of wideband substrate integrated waveguide (SIW) cavity based slot antenna is presented. The proposed antenna consists of a U-shaped slot etched in the ground plane which helps in achieving the ...