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Sensitivity and distance Based Performance Analysis for Batteryless Tags with Transmit Beamforming and Ambient Backscattering

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China Communications 2022年第2期19卷 109-117页

作者： Minzheng Jia Chaochao Yao Wei Liu Ruyi Ye Tutun Juhana Bo Ai Department of Information Engineering Beijing Polytechnic CollegeBeijing 100042China School of Computer and Information Technology Beijing Jiaotong UniversityBeijing 100044China School of Communication and Information Engineering Xi’an University of Posts and TelecommunicationsXi’an 710121China Chinese National Institute of Standalization Beijing 100088China School of Electrical Engineering and Informatics Institut Teknologi BandungIndonesia State Key Laboratory of Rail Traffic Control and Safety Beijing Jiaotong UniversityBeijing 100044China

Ambient backscatter is a new green technology for Internet of Things(IoT)that utilizes surrounding wireless signals to enable batteryless devices to communicate with other devices.The battery-free devices first harvest energy from ambient wireless signals and then backscatter the signals for communications.Clearly,sensitivity and distance are two important parameters for system performance.However,most existing studies on ambient backscatter communication systems do not consider the impact of the sensitivity of the energy-harvesting nodes and the distances between these devices.In this paper,we first provide a literature review for ambient communication technology and then take sensitivity and distance as two key parameters and investigate the sensitivity and distance based performance for ambient backscatter communication systems.Specifically,we establish the mathematical model based on distances between transceivers and backscattering nodes,extract a parameter that can differentiate the direct path and the backscattering path,evaluate the effects of transmit beamforming,design an energy detector for the reader,and analyze the outage probability of energy harvesting at the tag and the bit error rate(BER)at the reader.Simulations are then provided to corroborate the proposed studies.

关键词： ambient backscatter battery-free tag Internet of Things(IoT) outage probability performance analysis sensitivity transmission distance

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维普期刊数据库

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ELF-EM Signal Processing While Drilling Based on Human-Computer Interaction Combined Algorithm

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China Communications 2023年第6期20卷 178-198页

作者： Fukai Li Jian Wu Jian Chen Huaiyun Peng Yehuo Fan School of Telecommunications Engineering Xidian UniversityXi’an 710071China National Key Laboratory of Electromagnetic Environment China Research Institute of Radiowave PropagationQingdao 266107China

In the electromagnetic wave measurement while drilling(EM MWD), the extra low frequency electromagnetic wave(ELF-EM) below 20Hz was usually chosen as the carrier because of its transmission characteristics in the formation. However, as the drilling depth increases, the electromagnetic wave signals received on the ground gradually weaken, becoming lower than a certain signal-to-noise ratio(SNR)and making it impossible to be decoded or transmitted.The attenuation of electromagnetic wave in the formation is definitely one of the causes, but what matters more is the influence of environment noise at the well site, especially the in-band interference noise and random noise. Targeting at the out-of-band noise, the bandpass filter, which is invalid to the in-band noise,can be used to eliminate the noise out of the carrier’s main band. To cope with the question, an algorithm based on the human-computer interaction detection(HCID) was proposed in this paper that improves the SNR of ELF-EM signals, with the effective transmission distance of EM MWD increased. In this paper,the validity of the proposed HCID algorithm was verified through communication processing performance simulation and field data comparison, thus providing a reference for engineers and technicians in this field.Theoretical analysis and experimental data verification show that the combined algorithm decodes effectively under the in-band interference noise of-80d B SNR and in-band random noise of-17d B SNR.

关键词： measurement while drilling ELF-EM Inband noise HCID transmission distance

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维普期刊数据库

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Improved Magnetic Coupling Resonance Wireless Power Transfer System

Improved Magnetic Coupling Resonance Wireless Power Transfer...

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第三十九届中国控制会议

作者： Guangjun Wang Jianhui Sun School of Automation China University of Geosciences China Hubei key Laboratory of Advanced Control and Intelligent Automation for Complex System

For the power supply of spaceborne cameras on two-body satellites, an improved magnetic coupling resonant wireless power transfer system(WPT) is proposed. By establishing the equivalent circuit model of WPT system, the influence of topology model and high-Q repeating coil on system performance is analyzed. Finally, the correctness of theory and analysis was verified by experiments. The experimental results show that when the transmission distance of the improved WPT system is 11 cm, the load can receive 18.66 W of power and the transmission efficiency is 69%. Compared with the traditional two-coil WPT system,the system has a significant improvement in transmission distance, transmission power, and transmission efficiency, and can meet the technical requirements of spaceborne cameras in transmission distance, transmission power and transmission efficiency.

关键词： Magnetic coupling resonance WPT transmission distance transmission power transmission efficiency

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