对移动通信终端进行侦察与管控是维护正常通信秩序和电磁空间安全的应有之义。通信系统的行为模式是其重要的特征之一,传统的仅限于信号参数获取的侦察方法无法对移动通信系统的行为模式进行精准分析。针对这一问题,以终端与基站交互过...对移动通信终端进行侦察与管控是维护正常通信秩序和电磁空间安全的应有之义。通信系统的行为模式是其重要的特征之一,传统的仅限于信号参数获取的侦察方法无法对移动通信系统的行为模式进行精准分析。针对这一问题,以终端与基站交互过程中寻呼(Paging)信号与接入(Access)信号为突破口,充分利用该类信号特有的时频特征和明文传输特点,在对其进行有效截获的基础上,经过解调、解扰、解码得到其携带的信息比特。通过对信息比特实施解析,获得交互信令的含义,完成对移动通信终端行为模式的综合分析,揭示了寻呼与接入信号之间通信信息交互的时序逻辑关系,为信息对抗中的灵巧干扰提供了时间与信息字段上的侦察引导,是后续灵巧干扰的基础与前提。最后利用通信侦察接收机对第五代移动通信(5th Generation mobile communication,5G)信号进行实地侦收与分析,实验结果验证了所提方法的正确性与有效性,为移动通信终端的精准侦察与管控奠定了技术基础。展开更多
An experimental study is conducted on several retro-reflective beamforming schemes for wireless power transmission to multiple wireless power receivers(referred to herein as“targets”).The experimental results demons...An experimental study is conducted on several retro-reflective beamforming schemes for wireless power transmission to multiple wireless power receivers(referred to herein as“targets”).The experimental results demonstrate that,when multiple targets broadcast continuous-wave pilot signals at respective frequencies,a retro-reflective wireless power transmitter is capable of generating multiple wireless power beams aiming at the respective targets as long as the multiple pilot signals are explicitly separated from one another by the wireless power transmitter.However,various practical complications are identified when the pilot signals of multiple targets are not appropriately differentiated from each other by the wireless power transmitter.Specifically,when multiple pilot signals are considered to be carried by the same frequency,the wireless power transmission performance becomes heavily dependent on the interaction among the pilot signals,which is highly undesirable in practice.In conclusion,it is essential for a retro-reflective wireless power transmitter to explicitly discriminate multiple targets’pilot signals among each other.展开更多
The processing speed of the communication between nodes in a parallel processor has become the major bottleneck of the processor's performance.RDMA(Remote Direct Memory Access) technology has drawn more attention ...The processing speed of the communication between nodes in a parallel processor has become the major bottleneck of the processor's performance.RDMA(Remote Direct Memory Access) technology has drawn more attention recently due to its capability of transferring a larger amount of data, higher speed and reliability.4DSP(4 Digital Signal Processing) module comprised of Tiger-SHARC201 chip is connected by LVDS(Low Voltage Differential Signal) circuits.This paper proposes a general and reconfigurable RDMA platform and its corresponding communication protocol with all the routes linked based on the zero copy.The protocol transfers message of DSP by interrupting of DMA and is applied on massive remote image impression, which reduces memory needs and working burden of CPU.The experiment results show this platform is efficient, flexible, and expandable of being integrated to a larger scale in the next development stages.展开更多
文摘对移动通信终端进行侦察与管控是维护正常通信秩序和电磁空间安全的应有之义。通信系统的行为模式是其重要的特征之一,传统的仅限于信号参数获取的侦察方法无法对移动通信系统的行为模式进行精准分析。针对这一问题,以终端与基站交互过程中寻呼(Paging)信号与接入(Access)信号为突破口,充分利用该类信号特有的时频特征和明文传输特点,在对其进行有效截获的基础上,经过解调、解扰、解码得到其携带的信息比特。通过对信息比特实施解析,获得交互信令的含义,完成对移动通信终端行为模式的综合分析,揭示了寻呼与接入信号之间通信信息交互的时序逻辑关系,为信息对抗中的灵巧干扰提供了时间与信息字段上的侦察引导,是后续灵巧干扰的基础与前提。最后利用通信侦察接收机对第五代移动通信(5th Generation mobile communication,5G)信号进行实地侦收与分析,实验结果验证了所提方法的正确性与有效性,为移动通信终端的精准侦察与管控奠定了技术基础。
基金supported in part by the National Natural Science Foundation of China(61871220)the Natural Science Foundation of Jiangsu Province(BK20201293)。
文摘An experimental study is conducted on several retro-reflective beamforming schemes for wireless power transmission to multiple wireless power receivers(referred to herein as“targets”).The experimental results demonstrate that,when multiple targets broadcast continuous-wave pilot signals at respective frequencies,a retro-reflective wireless power transmitter is capable of generating multiple wireless power beams aiming at the respective targets as long as the multiple pilot signals are explicitly separated from one another by the wireless power transmitter.However,various practical complications are identified when the pilot signals of multiple targets are not appropriately differentiated from each other by the wireless power transmitter.Specifically,when multiple pilot signals are considered to be carried by the same frequency,the wireless power transmission performance becomes heavily dependent on the interaction among the pilot signals,which is highly undesirable in practice.In conclusion,it is essential for a retro-reflective wireless power transmitter to explicitly discriminate multiple targets’pilot signals among each other.
基金Supported by the NSFC (National Natural Science Foundation of China)the 863 Program (2006AA1332)ERIPKU, the Program for New Century Excellent Talents in University.
文摘The processing speed of the communication between nodes in a parallel processor has become the major bottleneck of the processor's performance.RDMA(Remote Direct Memory Access) technology has drawn more attention recently due to its capability of transferring a larger amount of data, higher speed and reliability.4DSP(4 Digital Signal Processing) module comprised of Tiger-SHARC201 chip is connected by LVDS(Low Voltage Differential Signal) circuits.This paper proposes a general and reconfigurable RDMA platform and its corresponding communication protocol with all the routes linked based on the zero copy.The protocol transfers message of DSP by interrupting of DMA and is applied on massive remote image impression, which reduces memory needs and working burden of CPU.The experiment results show this platform is efficient, flexible, and expandable of being integrated to a larger scale in the next development stages.
