Ultrashort wave satellite channel classification and recognition algorithm based on mirror filled spectrum and LA-ResNet50 by Shang WU, Lei SHEN, Lijun WANG, Ruxu ZHANG, Xin HU

“…In response to the classification and identification problems of 5 kHz channels, 25 kHz channels, broadband interference channels, narrowband interference channels, and single tone interference channels in the ultrashort wave frequency band, a classification and identification method for ultrashort wave channels based on mirror filled spectrum and LA-ResNet50 (LBP attention ResNet50) was proposed.The problem of difficulty in distinguishing between satellite channels and background noise under low signal-to-noise ratio, as well as the identification of signal channels and interference channels with similar characteristics, has been effectively solved.Firstly, the proposed method performs mirror symmetry on the ultrashort wave spectrum and fills it in, while blackening the edges of the spectrum to construct a mirror-filled spectrum, which improves the discrimination of different types of channel spectra.Then, channel attention was introduced into ResNet50 to focus the attention of the network model on the channel.Finally, a loss function based on cross entropy and local binary pattern (LBP) was proposed to improve the extraction effect of subtle texture features on signal channels and interference channels images.The proposed method based on mirror-filled spectrum and LA-ResNet50 has shown an improvement of 19.8%, 8.2%, 1.8%, and 0.8% in classification accuracy for ultrashort wave channels compared to the traditional method utilizing fast Fourier transform (FFT) spectrum thresholding, the YOLOv5s target detection and classification method based on mirror-filled spectrum, the Attention-ResNet50 method with attention mechanism based on mirror-filled spectrum, and the Transformer network method under a signal-to-noise ratio (SNR) of 10 dB.…”
Get full text

Ultrabroadband absorptive refractory plasmonics for photocatalytic hydrogen evolution reactions by Myeongcheol Go, Inju Hong, Dasol Lee, Sanghoon Kim, Junho Jang, Keon-Woo Kim, Sangmin Shim, Kijung Yong, Junsuk Rho, Jin Kon Kim

“…Abstract As an environmentally friendly and renewable method for hydrogen production powered by solar energy, photocatalytic hydrogen evolution reactions (HERs) using broadband absorbers have received much attention. Here, we report the fabrication and characterization of an ultrabroadband absorber for the photocatalytic HER. …”
Get full text

Phase-dependent Hanbury-Brown and Twiss effect for the complete measurement of the complex coherence function by Xuan Tang, Yunxiao Zhang, Xueshi Guo, Liang Cui, Xiaoying Li, Z. Y. Ou

“…Moreover, we discuss how to improve the signal level by using the more realistic continuous wave broadband anti-bunched light fields as the reference field. …”
Get full text

Structural Dynamics Analysis and Optimization of an Oil-Free Piston Air Compressor Based on Vibration and Noise Characteristics by Xiaoqing Sun, Yi Shen, Lai Yang, Huafang Liang

“…However, the abnormal vibration and noise of air compressors may pose a serious threat to the structural stability and smooth operation of these types of engineering equipment. To address the broadband noise and vibration problems of a new oil-free piston air compressor, we developed a hybrid optimization method that combines experimental testing, theoretical evaluation, and numerical simulation. …”
Get full text

Shot-Noise Limited Time-Encoded Raman Spectroscopy by Sebastian Karpf, Matthias Eibl, Wolfgang Wieser, Thomas Klein, Robert Huber

“…Here, we analyze the detection sensitivity of a shot-noise limited broadband stimulated time-encoded Raman (TICO-Raman) system in detail. …”
Get full text

Novel UHF RFID Near-Field Reader Antenna with Uniform Vertical Electric Field Distribution by Yanbin Chen, Xiaojuan Ren, Jimin Zhao, Xin Chen, Yuan Yao, Junsheng Yu, Xiaodong Chen

“…Second, the end of microstrip lines match the load to form a traveling wave mode of operation, so the two antennas have broadband characteristics. Third, both antennas are fed in a coaxial manner at the center of the antenna. …”
Get full text

A Novel Acoustic Ventilation Barrier Based on the Block-Shaped Space-Coiling Metamaterial by Qiaoyun Wu, Zhe Xu, Zhifeng Xu, Lan Ding, Chunfeng Zhao

“…Newly emerged acoustic barriers provide effective solutions for noise reductions of varied kinds in which acoustic barriers made of Fano resonance-based space-coiling metamaterial are reported to have promising application prospects for their broadband noise reduction ability and good ventilation performance. …”
Get full text

A Wideband and Polarization-Independent Metasurface Based on Phase Optimization for Monostatic and Bistatic Radar Cross Section Reduction by Jianxun Su, Yao Lu, Zengrui Li, Rongrong Zhang, Yaoqing (Lamar) Yang

“…A broadband and polarization-independent metasurface is analyzed and designed for both monostatic and bistatic radar cross section (RCS) reduction in this paper. …”
Get full text

Exploring short-term memory and listening effort in two-talker conversations: The influence of soft and moderate background noise. by Chinthusa Mohanathasan, Cosima A Ermert, Janina Fels, Torsten W Kuhlen, Sabine J Schlittmeier

“…All experiments were conducted in a quiet environment or under continuous broadband noise. For the latter, the signal-to-noise ratio in Experiments 1 and 2 was +10 dB (soft-noise condition), while in Experiment 3 it was -3 dB (moderate-noise condition). …”
Get full text

Compressive Sensing Based Bayesian Sparse Channel Estimation for OFDM Communication Systems: High Performance and Low Complexity by Guan Gui, Li Xu, Lin Shan, Fumiyuki Adachi

“…In orthogonal frequency division modulation (OFDM) communication systems, channel state information (CSI) is required at receiver due to the fact that frequency-selective fading channel leads to disgusting intersymbol interference (ISI) over data transmission. Broadband channel model is often described by very few dominant channel taps and they can be probed by compressive sensing based sparse channel estimation (SCE) methods, for example, orthogonal matching pursuit algorithm, which can take the advantage of sparse structure effectively in the channel as for prior information. …”
Get full text

Bone Dielectric Property Variation as a Function of Mineralization at Microwave Frequencies by Paul M. Meaney, Tian Zhou, Douglas Goodwin, Amir Golnabi, Elia A. Attardo, Keith D. Paulsen

“…A critical need exists for new imaging tools to more accurately characterize bone quality beyond the conventional modalities of dual energy X-ray absorptiometry (DXA), ultrasound speed of sound, and broadband attenuation measurements. In this paper we investigate the microwave dielectric properties of ex vivo trabecular bone with respect to bulk density measures. …”
Get full text

Design of Low-Cost Full W-Band 8th Harmonic Mixers for Frequency Extension of Spectrum Analyzer by Jian Guo, Kaiyi Zang, Zihan Zhang, Liang Zhao, Jie Xu, Zhengbin Xu

“…The circuit of 2-port mixer includes the input broadband bandpass filter, diodes, output lowpass filter, and matching circuits. …”
Get full text

Low-Bit Rate Feedback Strategies for Iterative IA-Precoded MIMO-OFDM-Based Systems by Sara Teodoro, Adão Silva, Rui Dinis, Atílio Gameiro

“…These strategies are applied to iterative MMSE-based IA techniques for the downlink of broadband wireless OFDM systems with limited feedback. …”
Get full text

A Pre-Emptive Scheduling Mechanism for Service Assurance of Network Slicing in Next Generation Cellular Networks by Ege Engin, Ibrahim Hokelek, Ali Gorcin, Hakan Ali Cirpan

“…In this paper, we propose a pre-emptive scheduling mechanism for managing network slices, specifically enhanced Mobile Broadband (eMBB) and Ultra-Reliable Low-Latency Communications (URLLC), in 5G and beyond (5GB) networks, leveraging network slicing to optimize resource management. …”
Get full text

All-Textile Compact Ultra-Wideband Microstrip Antenna with Full Ground Plane for WBAN Applications by Jinxin Du, Ruimeng Wang, Haiyan Li, Xue-Xia Yang, Christophe Roblin

“…Multiple branches are designed in a compact area to generate adjacent resonances, and their combination achieves broadband characteristics across the 4.83–9.57 GHz frequency band. …”
Get full text

Mapping Iterative Medical Imaging Algorithm on Cell Accelerator by Meilian Xu, Parimala Thulasiraman

“…In this paper, we map OS-SART on cell broadband engine (Cell BE). We effectively use the architectural features of Cell BE to provide an efficient mapping. …”
Get full text

An Improved Time-Frequency Analysis Method for Instantaneous Frequency Estimation of Rolling Bearing by Zengqiang Ma, Wanying Ruan, Mingyi Chen, Xiang Li

“…Considering nonstationary broadband fault vibration signals of rolling bearing under variable speed conditions, the time-frequency characteristics cannot be obtained accurately by SET alone. …”
Get full text

Adaptive Media Streaming to Mobile Devices: Challenges, Enhancements, and Recommendations by Kristian Evensen, Tomas Kupka, Haakon Riiser, Pengpeng Ni, Ragnhild Eg, Carsten Griwodz, Pål Halvorsen

“…Video streaming is predicted to become the dominating traffic in mobile broadband networks. At the same time, adaptive HTTP streaming is developing into the preferred way of streaming media over the Internet. …”
Get full text

Adaptable Meta-Signal Tracking for Next-Generation Satellite Navigation Systems and LEO PNT by Andrea Nardin, Fabio Dovis, Francesca Zanier, Floor Melman

“…The resulting architecture is tested in modern positioning, navigation and timing (PNT) scenarios, addressing in particular, the forthcoming low earth orbit (LEO) PNT paradigm to broad the technique’s applicability also towards potential piggybacked services hosted by broadband megaconstellations (e.g. Kuiper, Starlink). …”
Get full text

Wideband Omnidirectional Slotted-Waveguide Antenna Array Based on Trapezoidal Slots by Hugo Rodrigues Dias Filgueiras, James R. Kelly, Pei Xiao, I. F. da Costa, Arismar Cerqueira Sodré

“…The proposed antenna array and its enabling techniques present themselves as promising solutions for mm-wave application, including 5G enhanced mobile broadband (eMBB) communications.…”
Get full text