As one of the most concerned digital technologies in recent years,blockchain and distributed ledger technology are an important driving force for a new round of technological development.It is currently in the process...As one of the most concerned digital technologies in recent years,blockchain and distributed ledger technology are an important driving force for a new round of technological development.It is currently in the process of accelerating its evolution and maturity,and has gradually integrated with other digital technologies.It has been applied in many industries,providing decentralized solutions for various industries,realizing innovative storage models,and building a new trust system.As blockchain technology is officially incorporated into China’s new information infrastructure category,the application fields of blockchain have expanded rapidly,gradually extending from the financial field and government affairs to other fields in the real economy.At the same time,with the continuous development of the globalized economy,blockchain technology will also have a profound impact on international technological and economic development.Therefore,for the healthy and orderly development and real implementation of the blockchain industry,standardize the application of blockchain,effectively break through the cognitive and technical barriers between different countries,industries and systems on a global scale,prevent application risks,the development of the global blockchain industry needs standardization basis,which is particularly important and urgent.A sound standard system is an important key to the successful development of technology,and formulating the right standard at the right time for technology development helps ensure the ease of use and interoperability of the technology.From the perspective of international standardization,this article first introduces the general situation of ISO,ITU-T,IEEE,W3C and other international standardization organizations,and sorts out the status quo of the blockchain standardization working groups of mainstream international standardization organizations.All blockchain-related standards under development have been analyzed for the characteristics of international blockchain technology standards and industry application standards.Through data analysis,the overlaps,differences and conflicts in the field of international blockchain standard formulation are sorted out,and suggestions for blockchain standardization work in the application and development of blockchain technology standardization by international organizations and industries are put forward.The plans and layouts of future international standards are summarized to help the development of the international standardization of blockchain.展开更多
Although the wireless broadband access system is developing rapidly, its development is limited due to some disadvantages , such as small capacity of bandwidth and small coverage . The Wireless Mesh Network (WMN) is o...Although the wireless broadband access system is developing rapidly, its development is limited due to some disadvantages , such as small capacity of bandwidth and small coverage . The Wireless Mesh Network (WMN) is one of the important technologies for 'last mile 'broadband wireless access . The WMN can integrate with multiple wireless systems , such as Wireless Local Area Network (WLAN), Wireless Personal Area Network (WPAN), and Wireless Metropolitan Area Network (WMAN), to improve the performance of the wireless network and enlarge the coverage range . With the wide applications of the WMN, the IEEE 802 standard group is devoted to promoting the development of the WMN technology and establishing the related technical standards . At present, WMN standards have appeared in IEEE 802.11s , 802.15, 802.16, and 802.20.展开更多
V2X(vehicle to everything)通信是车联网中实现环境感知、信息交互与协同控制的重要关键技术。大唐电信科技产业集团最早提出并由中国企业主导的LTE-V2X国际标准作为其中的主流技术之一,能够在高速移动环境中提供低时延、高可靠、高速...V2X(vehicle to everything)通信是车联网中实现环境感知、信息交互与协同控制的重要关键技术。大唐电信科技产业集团最早提出并由中国企业主导的LTE-V2X国际标准作为其中的主流技术之一,能够在高速移动环境中提供低时延、高可靠、高速率、安全的通信能力,并能够最大程度利用TD-LTE已部署网络及终端芯片平台等资源。首先介绍了LTE-V2X的关键技术,并与IEEE 802.11p进行了比较;进而介绍了LTE-V2X的标准研究及其演进以及相关的产业发展和示范应用;最后展望了LTE-V2X的发展策略及其向5G NR-V2X的技术演进等,并提出了相关政策建议。展开更多
针对GIS开展的UHF法局部放电检测是目前主流的带电检测方法之一,现阶段局部放电UHF检测仪偏重于对局部放电的定性判断,迫切需要建立量值溯源链并评价检测结果的可信度。本文参考IEEE推荐的电场强度校准方法,对局部放电UHF检测仪关键参...针对GIS开展的UHF法局部放电检测是目前主流的带电检测方法之一,现阶段局部放电UHF检测仪偏重于对局部放电的定性判断,迫切需要建立量值溯源链并评价检测结果的可信度。本文参考IEEE推荐的电场强度校准方法,对局部放电UHF检测仪关键参量的量值溯源方法和平台进行了研究。对电气设备内部的电场信号采样,根据示值与场强的对应关系换算出被试品测得的电场强度。通过校准平台,将被试品与标准电场强度进行比对,得出被试品的测量误差为-3.74 d B^+2.98 d B。试验表明基于传递标准和稳态电场校准局部放电UHF检测仪主要参量的方法是可行的。展开更多
基金supported by the Key R&D Program of Zhejiang Province(2021C01105)the Key R&D Program of Guangdong Province(2020B0101090003)+1 种基金the National Key R&D Program of China(2021YFB2701100)These supports are gratefully acknowledged.
文摘As one of the most concerned digital technologies in recent years,blockchain and distributed ledger technology are an important driving force for a new round of technological development.It is currently in the process of accelerating its evolution and maturity,and has gradually integrated with other digital technologies.It has been applied in many industries,providing decentralized solutions for various industries,realizing innovative storage models,and building a new trust system.As blockchain technology is officially incorporated into China’s new information infrastructure category,the application fields of blockchain have expanded rapidly,gradually extending from the financial field and government affairs to other fields in the real economy.At the same time,with the continuous development of the globalized economy,blockchain technology will also have a profound impact on international technological and economic development.Therefore,for the healthy and orderly development and real implementation of the blockchain industry,standardize the application of blockchain,effectively break through the cognitive and technical barriers between different countries,industries and systems on a global scale,prevent application risks,the development of the global blockchain industry needs standardization basis,which is particularly important and urgent.A sound standard system is an important key to the successful development of technology,and formulating the right standard at the right time for technology development helps ensure the ease of use and interoperability of the technology.From the perspective of international standardization,this article first introduces the general situation of ISO,ITU-T,IEEE,W3C and other international standardization organizations,and sorts out the status quo of the blockchain standardization working groups of mainstream international standardization organizations.All blockchain-related standards under development have been analyzed for the characteristics of international blockchain technology standards and industry application standards.Through data analysis,the overlaps,differences and conflicts in the field of international blockchain standard formulation are sorted out,and suggestions for blockchain standardization work in the application and development of blockchain technology standardization by international organizations and industries are put forward.The plans and layouts of future international standards are summarized to help the development of the international standardization of blockchain.
文摘Although the wireless broadband access system is developing rapidly, its development is limited due to some disadvantages , such as small capacity of bandwidth and small coverage . The Wireless Mesh Network (WMN) is one of the important technologies for 'last mile 'broadband wireless access . The WMN can integrate with multiple wireless systems , such as Wireless Local Area Network (WLAN), Wireless Personal Area Network (WPAN), and Wireless Metropolitan Area Network (WMAN), to improve the performance of the wireless network and enlarge the coverage range . With the wide applications of the WMN, the IEEE 802 standard group is devoted to promoting the development of the WMN technology and establishing the related technical standards . At present, WMN standards have appeared in IEEE 802.11s , 802.15, 802.16, and 802.20.
文摘目前智慧城市建设中在有限的频谱资源上无法实现高效可靠的数据传输。文章依据IEEE 802.15.4c标准中MPSK接收器对成本和复杂度的设计要求,提出基于频偏估计的MPSK信号多符号非相干检测新算法。在全面考虑载波频率偏移(Carrier Frequency Offset,CFO)、载波相位偏移(Carrier Phase Offset,CPO)、乘性衰落和加性噪声的基础上,利用前导符和伪随机噪声(Pseudo-random Noise,PN)序列构造新度量函数估计以补偿频偏,并借助频偏补偿后的接收信号和PN序列推导完全形式的检测算法。低复杂度多符号检测(Multiple Symbol Detection,MSD)算法以完全形式检测分析为基础,利用每个符号局部最大度量和次大度量有效降低检测搜索空间和判决统计量计算次数,易于实现。最后,通过实验对所提算法进行仿真,结果表明系统检测性能和鲁棒性均显著提高。
文摘V2X(vehicle to everything)通信是车联网中实现环境感知、信息交互与协同控制的重要关键技术。大唐电信科技产业集团最早提出并由中国企业主导的LTE-V2X国际标准作为其中的主流技术之一,能够在高速移动环境中提供低时延、高可靠、高速率、安全的通信能力,并能够最大程度利用TD-LTE已部署网络及终端芯片平台等资源。首先介绍了LTE-V2X的关键技术,并与IEEE 802.11p进行了比较;进而介绍了LTE-V2X的标准研究及其演进以及相关的产业发展和示范应用;最后展望了LTE-V2X的发展策略及其向5G NR-V2X的技术演进等,并提出了相关政策建议。
文摘针对GIS开展的UHF法局部放电检测是目前主流的带电检测方法之一,现阶段局部放电UHF检测仪偏重于对局部放电的定性判断,迫切需要建立量值溯源链并评价检测结果的可信度。本文参考IEEE推荐的电场强度校准方法,对局部放电UHF检测仪关键参量的量值溯源方法和平台进行了研究。对电气设备内部的电场信号采样,根据示值与场强的对应关系换算出被试品测得的电场强度。通过校准平台,将被试品与标准电场强度进行比对,得出被试品的测量误差为-3.74 d B^+2.98 d B。试验表明基于传递标准和稳态电场校准局部放电UHF检测仪主要参量的方法是可行的。
