Intelligent devices have significantly improved our daily lives,but have engendered security and privacy concerns.To mitigate these issues,a real-time intelligent sensing system with privacy protection is proposed bas...Intelligent devices have significantly improved our daily lives,but have engendered security and privacy concerns.To mitigate these issues,a real-time intelligent sensing system with privacy protection is proposed based on a space-timecoding metasurface antenna.The employed metasurface antenna has a low profile,fast programmability,and flexible wavefront reconfiguration capability,enabling single-beam steering across a±60°range with 15°resolution over distances of 0.6-2 m.Through rapid beam steering,timely signal processing,and synchronization optimization,the system achieves precise and realtime target tracking with an ultralow latency of 0.01 s.Crucially,the system is configured to solely detect the presence and movement of individuals without capturing visual images,thus avoiding the privacy risks inherent in video surveillance.This research holds great potential for advancement in smart homes,healthcare systems,and cognitive radars,providing a viable solution to alleviate visual privacy concerns.展开更多
Simultaneous wireless information and power transfer(SWIPT)architecture is commonly applied in wireless sensors or Internet of Things(IoT)devices,providing both wireless power sources and communication channels.Howeve...Simultaneous wireless information and power transfer(SWIPT)architecture is commonly applied in wireless sensors or Internet of Things(IoT)devices,providing both wireless power sources and communication channels.However,the traditional SWIPT transmitter usually suffers from cross-talk distortion caused by the high peak-to-average power ratio of the input signal and the reduction of power amplifier efficiency.This paper proposes a SWIPT transmitting architecture based on an asynchronous space-time-coding digital metasurface(ASTCM).High-efficiency simultaneous transfer of information and power is achieved via energy distribution and information processing of the wireless monophonic signal reflected from the metasurface.We demonstrate the feasibility of the proposed method through theoretical derivations and experimental verification,which is therefore believed to have great potential in wireless communications and the IoT devices.展开更多
基金supported by the National Natural Science Foundation of China(Grant Nos.U2241243,52372101)the Beijing Natural Science Foundation(Grant No.JQ22010)+2 种基金the Fundamental Research Funds for the Central Universities(Grant No.2023ZCJH03)the Teaching Reform Projects at Beijing University of Posts and Telecommunications(BUPT)(Grant No.2024Y010)the Fund of State Key Laboratory of Information Photonics and Optical Communications(IPOC)(BUPT),China(Grant Nos.IPOC2022ZZ03,IPOC2024ZT13)。
文摘Intelligent devices have significantly improved our daily lives,but have engendered security and privacy concerns.To mitigate these issues,a real-time intelligent sensing system with privacy protection is proposed based on a space-timecoding metasurface antenna.The employed metasurface antenna has a low profile,fast programmability,and flexible wavefront reconfiguration capability,enabling single-beam steering across a±60°range with 15°resolution over distances of 0.6-2 m.Through rapid beam steering,timely signal processing,and synchronization optimization,the system achieves precise and realtime target tracking with an ultralow latency of 0.01 s.Crucially,the system is configured to solely detect the presence and movement of individuals without capturing visual images,thus avoiding the privacy risks inherent in video surveillance.This research holds great potential for advancement in smart homes,healthcare systems,and cognitive radars,providing a viable solution to alleviate visual privacy concerns.
基金supported by the Program of Song Shan Laboratory(included in the management of Major Science and Technology Program of Henan Province)(Nos.221100211300-03 and 221100211300-02)the National Key Research and Development Program of China(No.2018YFA0701904)+5 种基金the National Natural Science Foundation of China(Nos.62288101,61731010,62201139,and U22A2001)the 111 Project(No.111-2-05)the Jiangsu Province Frontier Leading Technology Basic Research Project(No.BK20212002)the Fundamental Research Funds for the Central Universities(No.2242022k60003)the National Natural Science Foundation(NSFC)for Distinguished Young Scholars of China(No.62225108)the Southeast University-China Mobile Research Institute Joint Innovation Center(No.R207010101125D9).
文摘Simultaneous wireless information and power transfer(SWIPT)architecture is commonly applied in wireless sensors or Internet of Things(IoT)devices,providing both wireless power sources and communication channels.However,the traditional SWIPT transmitter usually suffers from cross-talk distortion caused by the high peak-to-average power ratio of the input signal and the reduction of power amplifier efficiency.This paper proposes a SWIPT transmitting architecture based on an asynchronous space-time-coding digital metasurface(ASTCM).High-efficiency simultaneous transfer of information and power is achieved via energy distribution and information processing of the wireless monophonic signal reflected from the metasurface.We demonstrate the feasibility of the proposed method through theoretical derivations and experimental verification,which is therefore believed to have great potential in wireless communications and the IoT devices.
