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Receptance-Based Computation of Stability Crossing Curves for single-input-multiple-output Second-Order Linear Systems with Two Time-Delays

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INTERNATIONAL JOURNAL OF STRUCTURAL STABILITY AND DYNAMICS 2022年第1期22卷 2250002-2250002页

作者： Lv, Zhong-Hui Zhang, Jia-Fan Ouyang, Huajiang Wuhan Inst Shipbldg Technol Wuhan 430050 Peoples R China Wuhan Polytech Univ Sch Mech Engn Wuhan 430023 Peoples R China Univ Liverpool Sch Engn Liverpool L69 3GH Merseyside England

For a complete stability analysis of multi-dimensional controlled systems modeled in the framework of second-order linear differential equations with two time-delays, the determination of stability crossing curves (or stability switching curves) within the domain of the delays is significantly important. This paper presents a simple receptance-based approach to solve this problem for a single-input-multiple-output controlled system using its second-order model. The proposed approach is based on a reduced characteristic function of the controlled system. This characteristic function is directly related to the receptance of the uncontrolled system and has a peculiar form that is well-suited for an effective method of calculation of these curves. Moreover, this method can find the direction in which the characteristic roots cross the imaginary axis as the delays deviate from a stability crossing curve. An example case study with two independent and constant delays is given to demonstrate the effectiveness of the proposed approach.

关键词： Time-delay system second-order system single-input-multiple-output stability stability crossing curve receptance

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Channel Modeling for Multi-Receiver Molecular Communication Systems

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IEEE TRANSACTIONS ON COMMUNICATIONS 2023年第8期71卷 4499-4512页

作者： Yaylali, Gokberk Akdeniz, Bayram Cevdet Tugcu, Tuna Pusane, Ali Emre Bogazici Univ Dept Elect & Elect Engn TR-34342 Istanbul Turkiye Yale Univ Dept Elect Engn New Haven CT 06520 USA Univ Oslo Ctr Bioinformat N-0373 Oslo Norway Bogazici Univ Dept Comp Engn NETLAB TR-34342 Istanbul Turkiye

Molecular Communication via Diffusion (MCvD) is a prominent small-scale technology, which roots from the nature. With solid analytical foundations on channel response and advanced modulation techniques, molecular single-input-single-output (SISO) systems are one of the most studied molecular networks in the literature. However, the literature is yet to provide sufficient analytical channel modeling on molecular multiple-output systems with fully absorbing receivers, one of the common applications in the area. In this paper, a channel model for molecular single-input-multiple-output (SIMO) systems is proposed for estimating the channel response of such systems. With the model's recursive nature, the closed-form solution of the channel response of molecular 2-Rx SIMO systems is analytically derived. A simplified model with lower complexity is also presented at a cost of slightly less accurate channel estimation. The models are extended to the molecular SIMO systems with more than two receivers. The performance of the methods are evaluated for several topologies with different parameters, and the accuracy of the model is verified by comparing to computer-simulated channel estimations in terms of quantitative error metrics such as root-mean-squared error. The performance of the simplified model is verified by the amount of deviation, indicating sufficient channel modeling performance with reduced computational power.

关键词： Molecular communication single-input-multiple-output multiple receiver channel modeling

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Deep Learning Based Over-the-Air Channel Estimation Using a ZYNQ SDR Platform

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IEEE ACCESS 2022年 10卷 60610-60621页

作者： Banerjee, Bhaskar Khan, Zaheer Lehtomaki, Janne J. Juntti, Markku Univ Oulu Fac Informat Technol & Elect Engn Oulu 90570 Finland

Deep learning based channel estimation techniques have recently found an overwhelming interest owing to data-driven learning-based adaptability compared to conventional estimation techniques which rely on model-based approach. This paper exploits the availability of low cost software defined radio (SDR) devices to implement and test over-the-air (OTA) deep learning driven channel estimation solutions in realistic settings for 5G and beyond wireless communications. We have designed and implemented a ZYNQ SDR-based deep learning driven channel estimation platform which utilises real-world 5G new radio (NR) signals to develop and test the performance of a deep learning solution for wireless channel estimators. To this end, we have considered the time-frequency response of an OTA communication channel for single-input-single-output (SISO) and single-input-multiple-output (SIMO) networks under various line-of-sight and non-line-of-sight scenarios as a two-dimensional image. We have utilised convolutional deep learning technique for channel estimation. The main purpose is to use OTA samples obtained via the SDR platform to determine the unknown values of the channel response using known values at the pilot locations and evaluate performance compared to conventional technique. Our results show that the performance of the deep learning channel estimator using OTA data is as good as that of conventional methods with the flexibility to adapt based on data analytics of the time-varying nature of the channel.

关键词： Channel estimation Symbols OFDM Wireless communication Deep learning Convolutional neural networks 5G mobile communication Channel estimation single-input-single-output single-input-multiple-output convolutional neural networks deep learning OTA transmission Zynq FPGA

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Physical-Layer Security on Maximal Ratio Combining for SIMO Cognitive Radio Networks Over Cascaded κ-μ Fading Channels

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IEEE TRANSACTIONS ON COGNITIVE COMMUNICATIONS AND NETWORKING 2021年第4期7卷 1244-1252页

作者： Tashman, Deemah H. Hamouda, Walaa Concordia Univ Dept Elect & Comp Engn Montreal PQ H3G 1M8 Canada

This paper investigates the physical-layer security (PLS) of a single-input-multiple-output (SIMO) underlay cognitive radio network (CRN) over cascaded kappa-mu fading channels. A secondary user (SU) transmitter communicates with a secondary user receiver over cascaded kappa-mu channels. Moreover, an eavesdropper residing in the SUs transmission's range would be capable of intercepting the SUs' transmission. The SU destination and the eavesdropper are both assumed to be equipped with multiple antennas. Both of the receivers adopt maximalratio combining (MRC) over the multiple copies of the signal. In an underlay CRN, the SU transmitter should keep adjusting the transmission power to ensure not to disturb the primary users' (PUs) transmission. PLS is analyzed in terms of the secrecy outage probability (SOP) and the probability of non-zero secrecy capacity (P-nz). Results indicate the evident effect of the cascade level and the number of antennas at the eavesdropper over the secrecy of the SUs pair. In addition, results reveal that PLS can be strengthened by increasing the number of antennas at the legitimate receiver. The impact of the interference level tolerable by the PU receiver over SUs' secrecy is also analyzed. Monte-Carlo simulations and analytical results are presented to assess the system performance.

关键词： Cascaded general fading channels cognitive radio networks maximal-ratio combining physical-layer security single-input-multiple-output

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Outage analysis of MIMO NLOS-UV communication systems over atmospheric turbulence channels

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IET COMMUNICATIONS 2020年第14期14卷 2294-2302页

作者： Hariq, Sayed Hasan Karakaya, Bahattin Odabasioglu, Niyazi Istanbul Univ Cerrahpasa Dept Elect & Elect Engn TR-34320 Istanbul Turkey MLPCARE TR-34050 Istanbul Turkey

Rich scattering of the signals in the ultraviolet (UV) band of electromagnetic spectrum enables non-line-of-sight (NLOS) outdoor wireless connectivity. It eliminates the line-of-sight requirement of the links which are using the signals in the infra-red band. Besides scattering losses, UV signals also suffer from atmospheric turbulence-induced fading. The turbulent atmospheric channel causes fluctuations in the received signal intensity of a NLOS ultraviolet (NLOS-UV) link, resulting in power loss and the performance degradation at the receiver. In this study, spatial diversity techniques are investigated as an appealing fading mitigation technique for NLOS-UV systems over atmospheric turbulence channels. In particular, the outage probabilities of multiple-input-single-output (MISO), single-input-multiple-output (SIMO), and multiple-input-multiple-output (MIMO) links are studied, and the outage performances are investigated for different system configurations. Closed-form expressions are derived for the outage probability of MISO, SIMO, and MIMO systems, and the accuracy of the derivations is confirmed through Monte Carlo simulations. The outage probability of single-input-single-output link is also derived as a benchmark. The results demonstrate significant performance improvements through deployment and proper configuration of MIMO systems in NLOS-UV communication links.

关键词： MIMO communication telecommunication network reliability atmospheric turbulence SIMO communication MISO communication Monte Carlo methods probability free-space optical communication atmospheric optics outage analysis NLOS-UV communication links single-input-multiple-output single-input-single-output link Monte Carlo simulations MIMO system SIMO system MISO system outage probability multiple-input-single-output probabilities spatial diversity techniques performance degradation NLOS ultraviolet link received signal intensity turbulent atmospheric channel atmospheric turbulence-induced fading UV signals scattering losses nonline-of-sight outdoor wireless connectivity electromagnetic spectrum ultraviolet band atmospheric turbulence channels MIMO NLOS-UV communication systems

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A ZVS Integrated single-input-Dual-output DC/DC Converter for High Step-up Applications

A ZVS Integrated Single-Input-Dual-Output DC/DC Converter fo...

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8th Annual IEEE Energy Conversion Congress and Exposition (ECCE)

作者： Shang, Ming Wang, Haoyu ShanghaiTech Univ Sch Informat Sci & Technol Shanghai Peoples R China

ISBN: (纸本)9781509007370

This paper presents a novel integrated dc/dc topology with a step-up output and a step-down output. A new control scheme is developed to regulate both outputs simultaneously. Compared with discrete configurations, the proposed integrated converter utilizes a lower number of switches due to the reuse of components. The converter characteristics are studied comprehensively. It is demonstrated that all MOSFETs are turned on at zero voltage with reduced switching losses. For the step-up stage, the converter provides a high boost ratio and is able to clamp the switch voltage spikes. For the step-down stage, the steady-state characteristics and the dynamic performances are similar to that of the conventional buck converter. Moreover, the step-down output port can be extended to multiple ports, where the single-input-multiple-output (SIMO) version of converter can be derived. A 250 W, 42 V to 390 V and 15 V converter prototype is designed, analyzed and tested. The experimental results are presented to verify the feasibility of the topology.

关键词： dc/dc converter integrated converter single-input-dual-output (SIDO) single-input-multiple-output zero voltage switching

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A ZVS integrated single-input-dual-output DC/DC converter for high step-up applications

A ZVS integrated single-input-dual-output DC/DC converter fo...

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IEEE Energy Conversion Congress and Exposition

作者： Ming Shang Haoyu Wang School of Information Science and Technology ShanghaiTech University Shanghai China

ISBN: (纸本)9781509007387

关键词： zero voltage switching dc/dc converter integrated converter single-input-dual-output (SIDO) single-input-multiple-output

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Experimental study on 1 x 4 Real-time SIMO Diversity Reception Scheme For A Ultraviolet Communication System 20

Experimental study on 1 x 4 Real-time SIMO Diversity Recepti...

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European 20th Conference Networks Optical Communications (NOC)

作者： Meng, Xiao Zhang, Min Han, Dahai Song, Lijun Luo, Pengfei Beijing Univ Posts & Telecommun State Key Lab Info Photon & Opt Comm Beijing 100876 Peoples R China Northumbria Univ Dept Phys & Elect Engn Newcastle England

ISBN: (纸本)9781479987986

We firstly applied diversity reception technology to a real-time none-light-of-sight (NLOS) ultraviolet (UV) communication system based on a 9.3mW LED array. Field experiment with 4 receivers (Rxs) achieves bit error rate (BER) improvement, and related conclusions on single-input-multiple-output (SIMO) UV system design are given. Innovatively, the correlation characteristics in UV channel are studied according to measurements of two branches. Experiment result shows that once the transmission distance goes beyond 20m, the value of correlation coefficient remains to be less than 0.4, in which case the Rx branches can be considered to be fading independently, thus achieving diversity gain for the system.

关键词： ultraviolet communication single-input-multiple-output correlation characteristic

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Design of the Interface of a Calibration Transponder and an Altimeter/Scatterometer

Design of the Interface of a Calibration Transponder and an ...

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IEEE International Geoscience and Remote Sensing Symposium (IGARSS)

作者： Xu Xi-Yu Guo Wei Liu He-Guang Shi Ling-Wei Lin Wen-Ming Du Yue-Heng Chinese Acad Sci CAS Key Lab Microwave Remote Sensing Ctr Space Sci & Appl Res Beijing 100190 Peoples R China Grad Univ Chineese Acad Sci Beijing 100049 Peoples R China Tsinghua Univ Dept Elect Engn Elect Informat Engn Beijing 100084 Peoples R China

ISBN: (纸本)9781457710056

A transponder system is developed to fulfill the in-orbit calibration of the HY-2 satellite altimeter (ALT) and scatterometer (SCAT). The interaction of a calibration transponder and radar (altimeter/scatterometer) is rather complicated. After a brief description of the two active payloads on HY-2 satellite, several key issues are investigated in detail, including time arrangement and power budget. There are some innovations in calibration strategy, including the pre-distortion technology in ALT calibration and the single-input-multiple-output (SIMO) technology in the SCAT calibration.

关键词： Transponder altimeter scatterometer pre-distortion single-input-multiple-output

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A Distributed Power Control Scheme for Cellular Network Assisted D2D Communications

A Distributed Power Control Scheme for Cellular Network Assi...

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54th Annual IEEE Global Telecommunications Conference (GLOBECOM)

作者： Fodor, Gabor Reider, Norbert Ericsson Res SE-16480 Stockholm Sweden Ericsson Res H-1117 Budapest Hungary

ISBN: (纸本)9781424492688

Device-to-device (D2D) communications underlaying a cellular infrastructure has recently been proposed as a means of increasing the resource utilization, improving the user throughput and extending the battery lifetime of user equipments. In this paper we propose a new distributed power control algorithm that iteratively determines the signal-to-noise-and-interference-ratio (SINR) targets in a mixed cellular and D2D environment and allocates transmit powers such that the overall power consumption is minimized subject to a sum-rate constraint. The performance of the distributed power control algorithm is benchmarked with respect to the optimal SINR target setting that we obtain using the Augmented Lagrangian Penalty Function (ALPF) method. The proposed scheme shows consistently near optimum performance both in a single-input-multiple-output (SIMO) and a multiple-input-multiple-output (MIMO) setting.

关键词： ALPF method D2D communication Interference Loading MIMO MIMO MIMO communication OFDM Power control Receivers SIMO SINR target Signal to noise ratio augmented lagrangian penalty function method cellular network cellular radio device-to-device communication distributed power control scheme iterative methods multiple-input-multiple-output power consumption power control powers transmission allocation resource utilization signal-to-noise-and-interference-ratio target single-input-multiple-output sum-rate constraint telecommunication control user equipment battery lifetime

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