Radioengineering

Domů
česko
Brno
Radioengineering

Czech scientific journal focusing on wireless communication, electromagnetism, analog and digital circuits, optics and related fields.

22/03/2024

A Compact Dual Bandpass Filter Using Dual Composite Right-/Left-Handed and Open-Loop Ring Resonators for 4G and 5G Applications

In this paper a very compact design of a dual-band band pass filter (D-BPF) using dual composite right-/left-handed (D-CRLH) and open-loop ring (OLR) resonators is presented. To overcome the frequency ratio limitations of D-CLRH resonators technique, the D-BPF design combines D-CRLH and OLR resonators to finally perform a D-BPF. The filter covers the 2.6 and 3.5 GHz spectrums for 4G and 5G applications, respectively.
Read more here:https://www.radioeng.cz/fulltexts/2024/24_01_0213_0221.pdf

pass filters (BPFs) -band band pass filters (D-BPFs) composite right-/left-handed (D-CRLH) -loop ring (OLR) (BW) applications size

22/03/2024

Mainlobe Interference Suppression Based on Compressive Sensing and Covariance Matrix Reconstruction

When mainlobe interference exists in space, the traditional anti-interference methods have problems such as peak offset and the performance of sidelobe interference suppression reduction. To solve the above problems, this paper proposes a mainlobe interference suppression method based on compressive sensing and covariance matrix reconstruction. Firstly, an improved compressive sensing algorithm is proposed to accurately estimate the Direction Of Arrival of sources, and then the signal steering vectors and signal subspaces can be established.
Read more here:https://www.radioeng.cz/fulltexts/2024/24_01_0204_0212.pdf

interference suppression sensing matrix reconstruction Of Arrival (DOA)

22/03/2024

Weak Target Integration Detection Based on Radar Communication Integrated Signal via Constructed Step-LFM Model

Weak target detection is a great challenging in radar field. To detect weak targets via radar communication integrated signal, a method for constructed step-LFM (CStep-LFM) signal is proposed based on quadrature amplitude modulation-orthogonal frequency division multiplexing (QAM-OFDM) echoes. First, a QAM-OFDM and CStep-LFM model is established, and then a bandpass filters bank is used to transform the QAM-OFDM echo into a Step-LFM signal.
Read more here:https://www.radioeng.cz/fulltexts/2024/24_01_0195_0203.pdf

target detection -LFM communication integrated signal -OFDM

22/03/2024

Deep-Learning-Based ModCod Predictor for Satellite Channels

One of the significant challenges for satellite communications is to serve the ever-increasing demand for the use of finite resources. One option is to increase channel utilization, i.e., to transmit as much data as possible in a given frequency range. Since the channel is highly variable, primarily due to the ionosphere and troposphere, this goal can only be achieved by adaptively varying modulation and coding schemes.
Read more here:https://www.radioeng.cz/fulltexts/2024/24_01_0182_0194.pdf

links series prediction classification machine learning -S2 channel band -Earth communication signal propagation

22/03/2024

Differential Spatial Modulation Using New Index Bits

Spatial modulation (SM) has the potential to meet the requirements of 5G and beyond communication systems with features such as reduced hardware complexity and good trade-off between spectral efficiency and energy efficiency. In this study, an efficient non-square differential spatial modulation (DSM) scheme is presented in which the number of time slots is one more than the number of transmit antennas. The introduced scheme includes one empty time slot. At the other time slots, the time slots of the conventional DSM (CDSM) are used (the Gray code order (GCO) can also be used). There is one active antenna at each time slot of the proposed scheme.
Read more here:https://www.radioeng.cz/fulltexts/2024/24_01_0173_0181.pdf

modulation index modulation spatial modulation (DSM) active antenna propagation to noise per bit (SNRb)

22/03/2024

Spectrum Map Construction Method Based on Dynamic Window Size Tensor Ring Low-rank Factors

Spectrum maps can model the received signal strength over a geographical region and will play a pivotal role in the intended spectrum management scheme. Traditional spectrum map construction methods cannot fully utilize the spatial-temporal correlation characteristics of observed spectrum data in a time-varying spectrum situation. The computational complexity for real-time scenes is unaffordable, and the current spectrum situation cannot be estimated promptly.
Read more here:https://www.radioeng.cz/fulltexts/2024/24_01_0163_0172.pdf

-temporal spectrum data situation construction map radiation source

22/03/2024

A Robust Super-resolution Algorithm in a Low SNR Environment for Vital Sign Radar

We propose a robust super-resolution algorithm for vital sign radar in a low signal to noise ratio (SNR) environment. Conventional approaches, such as fast Fourier transform and super-resolution based algorithms, suffered to provide reliable results due to the limited data length and high noise level. To overcome these limitations, our proposed algorithm utilizes a low-complexity least mean square (LMS) filter and relaxation (RELAX) techniques to achieve robust performance in low SNR environments.
Read more here:https://www.radioeng.cz/fulltexts/2024/24_01_0155_0162.pdf

sign radar filter SNR complexity

22/03/2024

Modified Costas Loop for Carrier Phase Tracking in GPS Receivers

The carrier phase received at the receivers of the Global Positioning System (GPS) links is used to detect navigation data and to precisely determine the position, speed and time corresponding to the user's equipment. Therefore, subsystems for carrier phase tracking are crucial parts in all GPS receivers. When the propagation conditions are favorable, the method frequently used for phase tracking is based on Digital Phase-Locked Loop (DPLL)) and implemented through the discrete Costas loop operating under the modulated L1 carrier, in the case of a GPS receiver.
Read more here:https://www.radioeng.cz/fulltexts/2024/24_01_0145_0154.pdf

phase tracking receiver loop recovery

22/03/2024

The Design of Broadband Circularly Polarized Multi-beam Antenna with Linearly Polarized Feeding Source and Transmitarray Unit

Among the existing circularly polarized multi-beam transmitarray antennas, circularly or linearly-to-circularly polarized transmitarray units are always required. Naturally, designing circularly polarized units is more challenging than linear polarization. To simplify design and increase operation bandwidth, a novel method using linearly polarized transmitarray units and feeding sources is proposed for designing the circularly polarized multi-beam antenna.
Read more here:https://www.radioeng.cz/fulltexts/2024/24_01_0136_0144.pdf

polarization -beam antenna feed antenna

27/02/2024

On the Performance of Multi-Robot Wireless-based Networks

The performance of the multi-robot wireless-based networks is investigated in this paper. Particularly, we derive the outage probability (OP) and potential throughput (PT) of the worst terminal in the closed-form expressions under two scenarios, with and without direct transmission from the centre robot to all terminal robots. The considered system is complicated since it involves many random variables (RVs) and they are correlated owing to the common link from the central robot to the relay one.
Read more here:https://www.radioeng.cz/fulltexts/2024/24_01_0127_0135.pdf

-robot networks probability combining analysis throughput

27/02/2024

A High Directivity Microstrip Coupler Based on Reflective Resistors

In this paper, a novel high-directivity microstrip coupler based on reflective resistors is presented. The proposed coupler consists of three pairs of coupled-line sections and one pair of resistors. Generally, the coupling degree can be controlled by the coupled-lines, while the resistors are employed to adjust the amplitude of the reflected signal to cancel out the leakage signal. The mechanism of high directivity is derived and the S-parameters are presented.
Read more here:https://www.radioeng.cz/fulltexts/2024/24_01_0121_0126.pdf

directivity coupler -parameters

27/02/2024

Research on Locating Tunnel-Lining Defects Using Fast Synthetic Aperture Focusing Imaging Based on GPR

This paper proposes a method based on image processing algorithms for ground penetrating radar (GPR) to locate hidden defects in tunnel linings. Firstly, the fast synthetic aperture focusing imaging (Fast-SAFI) algorithm is used to accurately identify the morphology of tunnel-lining defects. Secondly, an iterative algorithm is used to determine the connected regions on the binary image, exclude background noise interference, and locate the centroid and vertices of the correct target connected regions to achieve the positioning of the depth of tunnel-lining defects.
Read more here:https://www.radioeng.cz/fulltexts/2024/24_01_0111_0120.pdf

processing penetrating radar synthetic aperture focusing imaging -lining defects method

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