随着智能信息社会的不断演进以及智慧城市建设的推进,电子设备的定位准确性和可靠性需求日益突显,特别是在万物互联的背景下,对定位精度和定位质量的要求变得更加迫切。无源定位技术因隐蔽性强、功耗低、不易被感知与干扰等诸多优点被...随着智能信息社会的不断演进以及智慧城市建设的推进,电子设备的定位准确性和可靠性需求日益突显,特别是在万物互联的背景下,对定位精度和定位质量的要求变得更加迫切。无源定位技术因隐蔽性强、功耗低、不易被感知与干扰等诸多优点被广泛应用于各个领域,尤其近年来,通感一体化(Integrated Sensing and Communication, ISAC)、机器学习、环境反向散射以及智能反射面的引入与发展,为无源定位在6G中的应用提供了新的契机。基于此,阐述了无源定位技术特点及分类;按照参数化的分类方式总结梳理无源定位方法及误差影响因素;讨论了多参数融合无源定位方案与优势;展望了无源定位技术在6G新愿景下典型的应用场景、潜在技术、挑战及未来研究方向。展开更多
Circuit sensitivity of sensors or tags without battery is one practical constraint for ambient backscatter communication systems.This letter considers using beamforming to reduce the sensitivity constraint and evaluat...Circuit sensitivity of sensors or tags without battery is one practical constraint for ambient backscatter communication systems.This letter considers using beamforming to reduce the sensitivity constraint and evaluates the corresponding performance in terms of the tag activation distance and the system capacity.Specifically,we derive the activation probabilities of the tag in the case of single-antenna and multi-antenna transmitters.Besides,we obtain the capacity expressions for the ambient backscatter communication system with beamforming and illustrate the power allocation that maximizes the system capacity when the tag is activated.Finally,simulation results are provided to corroborate our proposed studies.展开更多
文摘随着智能信息社会的不断演进以及智慧城市建设的推进,电子设备的定位准确性和可靠性需求日益突显,特别是在万物互联的背景下,对定位精度和定位质量的要求变得更加迫切。无源定位技术因隐蔽性强、功耗低、不易被感知与干扰等诸多优点被广泛应用于各个领域,尤其近年来,通感一体化(Integrated Sensing and Communication, ISAC)、机器学习、环境反向散射以及智能反射面的引入与发展,为无源定位在6G中的应用提供了新的契机。基于此,阐述了无源定位技术特点及分类;按照参数化的分类方式总结梳理无源定位方法及误差影响因素;讨论了多参数融合无源定位方案与优势;展望了无源定位技术在6G新愿景下典型的应用场景、潜在技术、挑战及未来研究方向。
基金supported by National Natural Science Foundation of China(No.62101601)the Fundamental Research Funds for the Central Universities under Grant 2020JBM017Joint Key Project of National Natural Science Foundation of China(No.U22B2004)。
文摘Circuit sensitivity of sensors or tags without battery is one practical constraint for ambient backscatter communication systems.This letter considers using beamforming to reduce the sensitivity constraint and evaluates the corresponding performance in terms of the tag activation distance and the system capacity.Specifically,we derive the activation probabilities of the tag in the case of single-antenna and multi-antenna transmitters.Besides,we obtain the capacity expressions for the ambient backscatter communication system with beamforming and illustrate the power allocation that maximizes the system capacity when the tag is activated.Finally,simulation results are provided to corroborate our proposed studies.
