Bluetooth low energy(BLE)-based indoor localization has been extensively researched due to its cost-effectiveness,low power consumption,and ubiquity.Despite these advantages,the variability of received signal strength...Bluetooth low energy(BLE)-based indoor localization has been extensively researched due to its cost-effectiveness,low power consumption,and ubiquity.Despite these advantages,the variability of received signal strength indicator(RSSI)measurements,influenced by physical obstacles,human presence,and electronic interference,poses a significant challenge to accurate localization.In this work,we present an optimised method to enhance indoor localization accuracy by utilising multiple BLE beacons in a radio frequency(RF)-dense modern building environment.Through a proof-of-concept study,we demonstrate that using three BLE beacons reduces localization error from a worst-case distance of 9.09-2.94 m,whereas additional beacons offer minimal incremental benefit in such settings.Furthermore,our framework for BLE-based localization,implemented on an edge network of Raspberry Pies,has been released under an open-source license,enabling broader application and further research.展开更多
Bluetooth技术可实现短距离、低功耗的无线通信和构成无线网络(Piconet and Scatternet),采用Bluetooth技术构建的数据采集无线网络系统(Data Acquisition Wireless Network System based on Bluetooth:DAWNS-B)便于进行集中测量和控制...Bluetooth技术可实现短距离、低功耗的无线通信和构成无线网络(Piconet and Scatternet),采用Bluetooth技术构建的数据采集无线网络系统(Data Acquisition Wireless Network System based on Bluetooth:DAWNS-B)便于进行集中测量和控制。介绍Bluetooth ASIC的结构特性以及DAWNS—B的结构原理、硬件电路接口和软件系统。DAWNS-B由前、后端单元构成,Bluetooth ASIC的HCI与PC计算机(或单片机)接口,Bluetooth协议软件栈控制Bluetooth ASIC对主机的HCI命令以及前、后端无线通信和网络通信,应用程序实现数据采集、处理DAWNS-B实现测控系统移动数据交换和无线网络功能,扩大和增强了数据采集系统的功能和应用场合。展开更多
Based on the analyses of the reported Gilbert mixers operating at low supply vol tage,a down-conversion mixer and an up-conversion mixer for 2.4GHz bluetooth transceiver are presented with the modified low voltage de...Based on the analyses of the reported Gilbert mixers operating at low supply vol tage,a down-conversion mixer and an up-conversion mixer for 2.4GHz bluetooth transceiver are presented with the modified low voltage design techniques,respe ctively.Feedback and current mirror techniques suitable for low voltage operatio n are used to improve the linearity of the up-conversion mixer,and folded-casc ode output stage is adopted to optimize the noise and conversion gain of the dow n-conversion mixer operating at low voltage.Based on 0.35μm CMOS technology,s imulations are performed with 2V supply voltage.The results show that 20dBm thir d-order intercept point (IIP3),87mV output signal amplitude are achieved for up -conversion mixer with about 3mA current;while 20dB conversion gain (CG),6.5nV /Hz input-referred noise,4.4dBm IIP3 are obtained for down-conversion mixer with about 3.5mA current.展开更多
基金supported by James M.Cox Foundation,National Institute on Deafness and Other Communication Disorders(grant no.1R21DC021029-01A1)Cox Enterprises Inc.,National Institute of Child Health and Human Development(grant no.AWD-006196-G1)Thrasher Research Fund Early Career Award Program.
文摘Bluetooth low energy(BLE)-based indoor localization has been extensively researched due to its cost-effectiveness,low power consumption,and ubiquity.Despite these advantages,the variability of received signal strength indicator(RSSI)measurements,influenced by physical obstacles,human presence,and electronic interference,poses a significant challenge to accurate localization.In this work,we present an optimised method to enhance indoor localization accuracy by utilising multiple BLE beacons in a radio frequency(RF)-dense modern building environment.Through a proof-of-concept study,we demonstrate that using three BLE beacons reduces localization error from a worst-case distance of 9.09-2.94 m,whereas additional beacons offer minimal incremental benefit in such settings.Furthermore,our framework for BLE-based localization,implemented on an edge network of Raspberry Pies,has been released under an open-source license,enabling broader application and further research.
文摘Bluetooth技术可实现短距离、低功耗的无线通信和构成无线网络(Piconet and Scatternet),采用Bluetooth技术构建的数据采集无线网络系统(Data Acquisition Wireless Network System based on Bluetooth:DAWNS-B)便于进行集中测量和控制。介绍Bluetooth ASIC的结构特性以及DAWNS—B的结构原理、硬件电路接口和软件系统。DAWNS-B由前、后端单元构成,Bluetooth ASIC的HCI与PC计算机(或单片机)接口,Bluetooth协议软件栈控制Bluetooth ASIC对主机的HCI命令以及前、后端无线通信和网络通信,应用程序实现数据采集、处理DAWNS-B实现测控系统移动数据交换和无线网络功能,扩大和增强了数据采集系统的功能和应用场合。
文摘Based on the analyses of the reported Gilbert mixers operating at low supply vol tage,a down-conversion mixer and an up-conversion mixer for 2.4GHz bluetooth transceiver are presented with the modified low voltage design techniques,respe ctively.Feedback and current mirror techniques suitable for low voltage operatio n are used to improve the linearity of the up-conversion mixer,and folded-casc ode output stage is adopted to optimize the noise and conversion gain of the dow n-conversion mixer operating at low voltage.Based on 0.35μm CMOS technology,s imulations are performed with 2V supply voltage.The results show that 20dBm thir d-order intercept point (IIP3),87mV output signal amplitude are achieved for up -conversion mixer with about 3mA current;while 20dB conversion gain (CG),6.5nV /Hz input-referred noise,4.4dBm IIP3 are obtained for down-conversion mixer with about 3.5mA current.
