- 标题
- 摘要
- 关键词
- 实验方案
- 产品
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[IEEE 2018 IEEE SENSORS - New Delhi, India (2018.10.28-2018.10.31)] 2018 IEEE SENSORS - Sensor for Real-Time Animal Condition and Movement Monitoring
摘要： A flexible, integrated lightweight and minimally intrusive monitoring system has been developed to assess animals’ behavioral responses. The system consists of wearable composite magnets and a miniaturized wireless communication module with a flexible battery. The shape and size of the NdFeB-PDMS composite magnets are highly versatile, while the magnetic and mechanical properties can be tailored within a wide range by the powder concentration. The magnetic field of the composite magnet is sensed by a 3-axial magnetic sensor, and the measured data is wirelessly transmitted using Bluetooth low energy communication standard to a smartphone and dashboard. To withstand corrosive environments and enhance the durability the composite magnets are coated with 2 μm of Parylene C, while surface passivation of the wireless module is achieved with 5 μm of Parylene C. The system has been implemented for real-time monitoring of crabs, giant turtles, and giant clams, indicating its potential for novel and affordable animal monitoring applications.
关键词： real-time monitoring,animal behavior,monitoring system,flexible,minimally intrusive,integrated,wearable composite magnets,wireless communication,Bluetooth low energy,lightweight
更新于2025-09-19 17:15:36
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[IEEE 2018 Asia Communications and Photonics Conference (ACP) - Hangzhou, China (2018.10.26-2018.10.29)] 2018 Asia Communications and Photonics Conference (ACP) - A combinding PAPR reduction method for DCO-OFDM UOWC
摘要： Optical orthogonal frequency division multiplexing (OFDM) has been adopted in underwater optical wireless communication (UOWC) system, to achieve high data rate and huge bandwidth, as well as to deal with the problem of inter symbol interference. However, it has the problem of high peak-to-average power ratio (PAPR) which will result in serious performance deterioration and increase equipment costs. In this paper, an SLM method is combined with μ-law companding method to reduce the PAPR of UOWC system, which reduce the signal PAPR by 6.8dB and is superior than both the traditional SLM and μ-law companding methods. As for the system bit error rate (BER), the proposed method has better performance than the μ-law companding method. With reasonable tradeoff with the BER, the proposed method has faster convergence than the traditional SLM method.
关键词： peak-to-average ratio,Orthogonal frequency division multiplexing,selective mapping,companding,underwater optical wireless communication
更新于2025-09-19 17:15:36
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High-speed colour-converting photodetector with all-inorganic CsPbBr3 perovskite nanocrystals for ultraviolet light communication
摘要： Optical wireless communication (OWC) using the ultra-broad spectrum of the visible-to-ultraviolet (UV) wavelength region remains a vital field of research for mitigating the saturated bandwidth of radio-frequency (RF) communication. However, the lack of an efficient UV photodetection methodology hinders the development of UV-based communication. The key technological impediment is related to the low UV-photon absorption in existing silicon photodetectors, which offer low-cost and mature platforms. To address this technology gap, we report a hybrid Si-based photodetection scheme by incorporating CsPbBr3 perovskite nanocrystals (NCs) with a high photoluminescence quantum yield (PLQY) and a fast photoluminescence (PL) decay time as a UV-to-visible colour-converting layer for high-speed solar-blind UV communication. The facile formation of drop-cast CsPbBr3 perovskite NCs leads to a high PLQY of up to ~73% and strong absorption in the UV region. With the addition of the NC layer, a nearly threefold improvement in the responsivity and an increase of ~25% in the external quantum efficiency (EQE) of the solar-blind region compared to a commercial silicon-based photodetector were observed. Moreover, time-resolved photoluminescence measurements demonstrated a decay time of 4.5 ns under a 372-nm UV excitation source, thus elucidating the potential of this layer as a fast colour-converting layer. A high data rate of up to 34 Mbps in solar-blind communication was achieved using the hybrid CsPbBr3–silicon photodetection scheme in conjunction with a 278-nm UVC light-emitting diode (LED). These findings demonstrate the feasibility of an integrated high-speed photoreceiver design of a composition-tuneable perovskite-based phosphor and a low-cost silicon-based photodetector for UV communication.
关键词： CsPbBr3 perovskite nanocrystals,Silicon-based photodetector,UV photodetection,Solar-blind UV communication,Optical wireless communication
更新于2025-09-19 17:13:59
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[IEEE IGARSS 2019 - 2019 IEEE International Geoscience and Remote Sensing Symposium - Yokohama, Japan (2019.7.28-2019.8.2)] IGARSS 2019 - 2019 IEEE International Geoscience and Remote Sensing Symposium - Knowledge Guided Classification Of Hyperspectral Image Based on Hierarchical Class Tree
摘要： We analyze the performance of an interference-limited decode-and-forward cooperative relaying system that comprises a source, a destination, and N relays, arbitrarily placed on the plane and suffering from interference by a set of interferers placed according to a spatial Poisson process. In each transmission attempt, first, the transmitter sends a packet; subsequently, a single one of the relays that received the packet correctly, if such a relay exists, retransmits it. We consider both selection combining and maximal ratio combining at the destination, Rayleigh fading, and interferer mobility. We derive expressions for the probability that a single transmission attempt is successful, as well as for the distribution of the transmission attempts until a packet is successfully transmitted. Results provide design guidelines applicable to a wide range of systems. Overall, the temporal and spatial characteristics of the interference play a significant role in shaping the system performance. Maximal ratio combining is only helpful when relays are close to the destination; in harsh environments, having many relays is particularly helpful, and relay placement is critical; the performance improves when interferer mobility increases; and a tradeoff exists between energy efficiency and throughput.
关键词： interference,relay networks,stochastic processes,Cooperative communication,wireless communication
更新于2025-09-19 17:13:59
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Wireless Sliding MPPT Control of Photovoltaic Systems in Distributed Generation Systems
摘要： The aim of a photovoltaic (PV) system’s control is the extraction of the maximum power even if the irradiance, the temperature, or the parameters vary. To do that, a maximum power point tracking (MPPT) algorithm is required. In this work, a sliding control is designed to regulate the PV modules’ output voltage and make the panel work at the maximum power voltage. This control is selected to improve the robustness, the transient dynamic response, and the time response of the system under changeable environmental conditions, adjusting the duty cycle of the DC/DC converter. The DC/DC converter connected to the PV module output is a buck-boost converter. This configuration presents the advantage of providing voltages lower or higher than supplied by the photovoltaic modules to provide the required voltage to the load (including the voltages ceded by telecommunication loads, amongst others). In addition, a remote sliding control is developed to make the global supervision of the PV system in distributed generation grids. The designed algorithm is tested in an experimental platform, both locally and remotely connected to the base station, to prove the effectiveness of the sliding control. Thus, the communication effect in the control is also analyzed.
关键词： maximum power point tracking (MPPT),sliding mode control,photovoltaic system,wireless communication
更新于2025-09-19 17:13:59
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[IEEE 2019 16th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology (ECTI-CON) - Pattaya, Chonburi, Thailand (2019.7.10-2019.7.13)] 2019 16th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology (ECTI-CON) - The Designation of the Lightning Protection for the Photovoltaic Module by using the Protective Angle Method
摘要： In this paper, a new and efficient methodology is proposed to quickly and precisely evaluate the power consumption and performance of wireless communication base-band systems implemented in field-programmable gate arrays (FPGAs). As the complexity of such systems is still growing, being able to estimate both power and performance of a design has become a major issue. FPGA devices constitute a promising technology in this highly constrained context. However, to respect their power budget, designers need to explore the design space very soon in the design process. This is performed prior to any implementation. Based on the innovative definition of a scenario, which enables comparison among wireless communication applications in a formal manner, each parameter can be evaluated to meet the power-performance tradeoff. In this paper, the proposed methodology is realized in two steps using a low-level characterization process and high-level system modeling. Another major contribution consists in considering components’ time activity to refine power estimations results. We demonstrate the effectiveness of the proposed methodology throughout several domain-specific use cases, with a focus on hardware base-band processing in the wireless communication domain. As compared with current low-level FPGAs vendor tools, an important speedup factor is obtained, and a maximal relative error lower than 5% is reached.
关键词： system modelling,SystemC,Wireless communication,field programmable gate array,power consumption
更新于2025-09-19 17:13:59
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[IEEE 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) - Chicago, IL, USA (2019.6.16-2019.6.21)] 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) - Physics-guided characterization and optimization of solar cells using surrogate machine learning model
摘要： Multiple transmitting antennas can considerably increase the downlink spectral ef?ciency by beamforming to multiple users at the same time. However, multiuser beamforming requires channel state information (CSI) at the transmitter, which leads to training overhead and reduces overall achievable spectral ef?ciency. In this paper, we propose and analyze a sequential beamforming strategy that utilizes full-duplex base station to implement downlink data transmission concurrently with CSI acquisition via in-band closed or open loop training. Our results demonstrate that full-duplex capability can improve the spectral ef?ciency of uni-directional traf?c, by leveraging it to reduce the control overhead of CSI estimation. In moderate SNR regimes, we analytically derive tight approximations for the optimal training duration and characterize the associated respective spectral ef?ciency. We further characterize the enhanced multiplexing gain performance in the high SNR regime. In both regimes, the performance of the proposed full-duplex strategy is compared with the half-duplex counterpart to quantify spectral ef?ciency improvement. With experimental data and 3-D channel model from 3GPP, in a 1.4 MHz 8 × 8 system LTE system with the block length of 500 symbols, the proposed strategy attains a spectral ef?ciency improvement of 130% and 8% with closed and open loop training, respectively.
关键词： full-duplex systems,massive MIMO,Wireless communication,multiuser MIMO systems,limited feedback
更新于2025-09-19 17:13:59
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[IEEE 2019 Thirteenth International Congress on Artificial Materials for Novel Wave Phenomena (Metamaterials) - Rome, Italy (2019.9.16-2019.9.21)] 2019 Thirteenth International Congress on Artificial Materials for Novel Wave Phenomena (Metamaterials) - Frequency Tunable Monopole Patch Antenna Using Broadside Coupled Split Ring Resonator for Wireless Communication Applications
摘要： This paper presents metamaterial based monopole patch antenna capable of tuning the radiating frequency over a wide bandwidth. The proposed novel antenna structure makes use of the metamaterial properties of Broadside Coupled Split Ring Resonator (BCSRR) for frequency tuning. The magnetic resonant frequency of the proposed antenna can be tuned by slightly adjusting the interplanar distance between the rings of the BCSRR so that the coupling due to effective capacitance and inductance between them can be changed. The desired range of frequency tuning for potential applications like Global System for Mobiles (GSM), Bluetooth, Wi-Fi, Wi-Max, WLAN etc. is achieved by proper designing of the geometrical parameters of BCSRR. The different antennas for different applications in a single device can be replaced with the proposed novel metamaterial based antenna structure.
关键词： monopole patch antenna,wireless communication,frequency tuning,metamaterial,Broadside Coupled Split Ring Resonator
更新于2025-09-16 10:30:52
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[IEEE 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Huangshan, China (2019.8.5-2019.8.8)] 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Error Analysis of the Impulse Response on VCSEL-based Optical Wireless Communication Channel Using a Monte Carlo Ray-Tracing Algorithm
摘要： This article proposed a Monte Carlo ray-tracing method (MCRM) based on Gaussian beam emitter for optical wireless communication (OWC) channel estimation and established two typical indoor communication systems as uplink and full-link models. Formulas are given with targeted parameters for these two specific link models. The calculation results show that the impulse response of uplink models have twice larger and 10 ns faster than that of full-link models. Compared with the conventional Lambertian OWC systems, the Gaussian systems have larger impulse response and lower relative error, which indicates that Gaussian emitter is a promising candidate for indoor OWC system.
关键词： Channel estimation,VCSEL,Monte Carlo Ray-tracing method,Optical wireless communication
更新于2025-09-16 10:30:52
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[IEEE 2019 16th Canadian Workshop on Information Theory (CWIT) - Hamilton, ON, Canada (2019.6.2-2019.6.5)] 2019 16th Canadian Workshop on Information Theory (CWIT) - Angular MIMO for Underwater Wireless Optical Communications: Channel Modelling and Capacity
摘要： An alternative architecture for imaging multiple-input/multiple-output (MIMO) underwater wireless optical communications (UWOCs) is proposed which relies on the transmission in angle rather than directly in space. The angular MIMO (A-MIMO) system has advantages over conventional underwater MIMO systems (C-MIMO) in that the image magni?cation is invariant to link range, and angular transmission greatly relaxes the alignment requirements of such links. These features are especially important for underwater wireless sensor networks (UWSNs), where the maintaining alignment between underwater vehicles and ?oating sensors nodes may be dif?cult in such dynamic environments. In this paper, we describe the architecture of A-MIMO for underwater channels and numerically characterize it in clear and coastal seawater conditions. For comparison a C-MIMO underwater system with similar parameters is also characterized and the channel capacities for A-MIMO and a C-MIMO are contrasted against link distances and misalignment errors. The numerical results show that A-MIMO maintains the link capacity against the misalignment conditions far better than C-MIMO while using a smaller size transceiver.
关键词： angular MIMO,link capacity,underwater optical wireless communication,misalignment,angle of arrival
更新于2025-09-16 10:30:52