Integrated sensing and communication(ISAC)technology is a promising candidate for next-generation communication systems.However,severe co-site interference in existing ISAC systems limits the communication and sensing...Integrated sensing and communication(ISAC)technology is a promising candidate for next-generation communication systems.However,severe co-site interference in existing ISAC systems limits the communication and sensing performance,posing significant challenges for ISAC interference management.In this work,we propose a novel interference management scheme based on the normalized least mean square(NLMS)algorithm,which mitigates the impact of co-site interference by reconstructing the interference from the local transmitter and canceling it from the received signal.Simulation results demonstrate that,compared to typical adaptive interference management schemes based on recursive least square(RLS)and stochastic gradient descent(SGD)algorithms,the proposed NLMS algorithm effectively cancels co-site interference and achieves a good balance between computational complexity and convergence performance.展开更多
工业机器人的传动效率直接影响到工业节能效果。针对齿轮箱故障诊断能力,设计了一种基于深度主动学习(Deep Active Learning,DAL)的工业机器人RV齿轮箱故障识别方法,并开展测试分析。研究结果表明,边缘抽样、深度学习、深度主动学习、...工业机器人的传动效率直接影响到工业节能效果。针对齿轮箱故障诊断能力,设计了一种基于深度主动学习(Deep Active Learning,DAL)的工业机器人RV齿轮箱故障识别方法,并开展测试分析。研究结果表明,边缘抽样、深度学习、深度主动学习、随机抽样分别达到77.23%、94.35%、97.18%和84.26%的准确率,表明该方法可以有效地过滤出较难鉴别的样品。分析混淆矩阵表明,在只利用小样本进行训练的情况下,DAL算法取得了比传统学习算法更优的处理结果。该研究有助于提高工业机器人控制效率,具有广泛的应用价值。展开更多
蜂窝移动通信有望进一步整合低轨卫星实现星地融合网络(Integrated Satellite-Terrestrial Networks,ISTNs),可以极大地扩展卫星和通信的覆盖范围,减少对地面基础设施的依赖以及重复建设,从而满足海上、空中、偏远地区等通信场景需求并...蜂窝移动通信有望进一步整合低轨卫星实现星地融合网络(Integrated Satellite-Terrestrial Networks,ISTNs),可以极大地扩展卫星和通信的覆盖范围,减少对地面基础设施的依赖以及重复建设,从而满足海上、空中、偏远地区等通信场景需求并完善密集建筑、室内、隧道等区域的定位功能。通信导航一体化(Integrated Communication and Navigation,ICAN)是星地融合的核心技术,从通信导航互相补充覆盖的角度将通导一体化分为通信覆盖增强和导航覆盖增强两个层面,基于此总结了一体化波形的研究进展,包括通导一体化波形设计、通导一体化信号处理技术以及通导一体化性能度量指标等。重点阐述了基于毫米波频段的研究,提出了通信覆盖增强的毫米波通导一体化系统,并展望了通导一体化未来发展和面临的挑战。展开更多
在高移动性场景中,利用正交时频空(Orthogonal Time Frequency Space,OTFS)调制实现通感一体化(Integrated Sensing and Communication,ISAC)技术具有显著优势。然而,OTFS-ISAC的波形设计及其信号处理极具挑战因而成为了悬而未决的难题...在高移动性场景中,利用正交时频空(Orthogonal Time Frequency Space,OTFS)调制实现通感一体化(Integrated Sensing and Communication,ISAC)技术具有显著优势。然而,OTFS-ISAC的波形设计及其信号处理极具挑战因而成为了悬而未决的难题。针对OTFS-ISAC感知接收处理时性能受限的问题,提出了基于最小均方误差(Minimum Mean Square Error,MMSE)和基于正交匹配追踪(Orthogonal Matching Pursuit,OMP)的感知信号处理算法。利用MMSE准则最小化均方误差进行感知,根据残差与原子相关性最大的准则迭代获得雷达感知信道的稀疏逼近元。仿真结果表明,相较于已有研究,所提方法不仅能准确感知目标,还获得了显著的感知性能增益,验证了所提方法的正确性与有效性。展开更多
Objective In recent years, the dispute regarding the Quatemary glacier of eastem China has become a research focus again, and one of the important focuses is the ＂glacial pothole＂. In fact, the micro-topographic ge...Objective In recent years, the dispute regarding the Quatemary glacier of eastem China has become a research focus again, and one of the important focuses is the ＂glacial pothole＂. In fact, the micro-topographic genesis of the rocky surface mortar may be interpreted differently in different places, including pothole, weathering pit, sea cave and wind-eroding pot. It is very controversial to determine this ＂glacial pothole＂.展开更多
基金supported in part by the National Key Research and Development Program of China under Grant No.2021YFB2900200in part by National Natural Science Foundation of China under Grant Nos.61925101 and 62271085in part by Beijing Natural Science Foundation under Grant No.L223007-2.
文摘Integrated sensing and communication(ISAC)technology is a promising candidate for next-generation communication systems.However,severe co-site interference in existing ISAC systems limits the communication and sensing performance,posing significant challenges for ISAC interference management.In this work,we propose a novel interference management scheme based on the normalized least mean square(NLMS)algorithm,which mitigates the impact of co-site interference by reconstructing the interference from the local transmitter and canceling it from the received signal.Simulation results demonstrate that,compared to typical adaptive interference management schemes based on recursive least square(RLS)and stochastic gradient descent(SGD)algorithms,the proposed NLMS algorithm effectively cancels co-site interference and achieves a good balance between computational complexity and convergence performance.
文摘工业机器人的传动效率直接影响到工业节能效果。针对齿轮箱故障诊断能力,设计了一种基于深度主动学习(Deep Active Learning,DAL)的工业机器人RV齿轮箱故障识别方法,并开展测试分析。研究结果表明,边缘抽样、深度学习、深度主动学习、随机抽样分别达到77.23%、94.35%、97.18%和84.26%的准确率,表明该方法可以有效地过滤出较难鉴别的样品。分析混淆矩阵表明,在只利用小样本进行训练的情况下,DAL算法取得了比传统学习算法更优的处理结果。该研究有助于提高工业机器人控制效率,具有广泛的应用价值。
文摘蜂窝移动通信有望进一步整合低轨卫星实现星地融合网络(Integrated Satellite-Terrestrial Networks,ISTNs),可以极大地扩展卫星和通信的覆盖范围,减少对地面基础设施的依赖以及重复建设,从而满足海上、空中、偏远地区等通信场景需求并完善密集建筑、室内、隧道等区域的定位功能。通信导航一体化(Integrated Communication and Navigation,ICAN)是星地融合的核心技术,从通信导航互相补充覆盖的角度将通导一体化分为通信覆盖增强和导航覆盖增强两个层面,基于此总结了一体化波形的研究进展,包括通导一体化波形设计、通导一体化信号处理技术以及通导一体化性能度量指标等。重点阐述了基于毫米波频段的研究,提出了通信覆盖增强的毫米波通导一体化系统,并展望了通导一体化未来发展和面临的挑战。
文摘在高移动性场景中,利用正交时频空(Orthogonal Time Frequency Space,OTFS)调制实现通感一体化(Integrated Sensing and Communication,ISAC)技术具有显著优势。然而,OTFS-ISAC的波形设计及其信号处理极具挑战因而成为了悬而未决的难题。针对OTFS-ISAC感知接收处理时性能受限的问题,提出了基于最小均方误差(Minimum Mean Square Error,MMSE)和基于正交匹配追踪(Orthogonal Matching Pursuit,OMP)的感知信号处理算法。利用MMSE准则最小化均方误差进行感知,根据残差与原子相关性最大的准则迭代获得雷达感知信道的稀疏逼近元。仿真结果表明,相较于已有研究,所提方法不仅能准确感知目标,还获得了显著的感知性能增益,验证了所提方法的正确性与有效性。
基金financially supported by the National Natural Science Foundation of China(grant No. 41472155)
文摘Objective In recent years, the dispute regarding the Quatemary glacier of eastem China has become a research focus again, and one of the important focuses is the ＂glacial pothole＂. In fact, the micro-topographic genesis of the rocky surface mortar may be interpreted differently in different places, including pothole, weathering pit, sea cave and wind-eroding pot. It is very controversial to determine this ＂glacial pothole＂.
