Radar cross section(RCS)plays a critical role in modeling target scattering characteristics and enhancing the precision of target detection and localization in integrated sensing and communication(ISAC)systems.This pa...Radar cross section(RCS)plays a critical role in modeling target scattering characteristics and enhancing the precision of target detection and localization in integrated sensing and communication(ISAC)systems.This paper investigates the human body RCS at 26 GHz via multiangle channel measurements under different clothing conditions.Based on calibrated electromagnetic(EM)parameters,the RCS characteristics of the human body in far-field conditions are analyzed using ray-tracing(RT)simulations.Some suggestions for the design of ISAC systems are also discussed.The results provide a solid theoretical foundation and practical reference for the modeling of target scattering characteristics for ISAC channels.展开更多
Unsourced random access(URA)is a new perspective of massive access which aims at supporting numerous machine-type users.With the appearance of carrier frequency offset(CFO),joint activity detection and channel estimat...Unsourced random access(URA)is a new perspective of massive access which aims at supporting numerous machine-type users.With the appearance of carrier frequency offset(CFO),joint activity detection and channel estimation,which is vital for multiple-input and multiple-output URA,is a challenging task.To handle the phase corruption of channel measurements under CFO,a novel compressed sensing algorithm is proposed,leveraging the parametric bilinear generalized approximate message passing framework with a Markov chain support model that captures the block sparsity structure of the considered angular domain channel.An uncoupled transmission scheme is proposed to reduce system complexity,where slot-emitted messages are reorganized relying on clustering unique user channels.Simulation results reveal that the proposed transmission design for URA under CFO outperforms other potential methods.展开更多
With the emergence of the 6G technology,integrated sensing and communication(ISAC)has become a hot-spot vertical application.The low-altitude scenario is considered to be a significant use case of the ISAC.However,the...With the emergence of the 6G technology,integrated sensing and communication(ISAC)has become a hot-spot vertical application.The low-altitude scenario is considered to be a significant use case of the ISAC.However,the existing channel model is hard to meet the demands of the sensing function.The radar-cross-section(RCS)is a critical feature for the sensing part,while accurate RCS data for the typical frequency band of ISAC are still lacking.Therefore,this paper conducts measurements and analysis of the RCS data of the unmanned aerial vehicles(UAVs)under multiple poses and angles in real flying conditions.The echo from a UAV is acquired in an anechoic chamber,and the RCS values are calculated.The results of different flying attitudes are analyzed,providing RCS features for the ISAC applications.展开更多
针对高速铁路(简称:高铁)动车组部件故障诊断和预测的业务需求,依托动车组故障预测与健康管理(PHM,Prognostic and Health Management)系统,在基于人工智能的高铁动车组智能运营维护(简称:运维)算法研究平台中构建高铁动车组智能运维数...针对高速铁路(简称:高铁)动车组部件故障诊断和预测的业务需求,依托动车组故障预测与健康管理(PHM,Prognostic and Health Management)系统,在基于人工智能的高铁动车组智能运营维护(简称:运维)算法研究平台中构建高铁动车组智能运维数据分析系统。介绍了高铁动车组智能运维算法研究平台的架构,以及高铁动车组智能运维数据分析系统的数据处理流程和关键算法。并以高铁动车组客室空调为例,选取客室空调相关传感器数据进行数据分析,得到影响客室空调健康状况的特征,并对聚类结果进行健康度数据标注,作为客室空调健康评估模型开发的基础。展开更多
In this paper,a contention-based connection-free transmission scheme is proposed to meet the stringent requirements of ultra-reliability and low-latency for critical machine-type communication(cMTC).To improve reliabi...In this paper,a contention-based connection-free transmission scheme is proposed to meet the stringent requirements of ultra-reliability and low-latency for critical machine-type communication(cMTC).To improve reliability,we design multiple independent sparse orthogonal pilots(MISOP)to significantly reduce the probability of pilot collision to the order of 10^(−5).Besides,the advancements of massive MIMO(mMIMO)are exploited to further enhance the reliability.To achieve low latency,connection-free slot-based one-shot transmission without retransmissions is adopted.On the receiver side,single round of multi-user detection(MUD)without interference cancellation(IC)can reduce the processing delay.The imprecise synchronization between cMTC device and the gNB in connection-free transmission,e.g.,time and frequency offsets,are also considered.The simulation results shows that the proposed scheme can well satisfy the ambitious requirements of cMTC,and has the potential applications in supporting massive cMTC devices in 6G.展开更多
The further integration of telecommunications and industry has been consider⁃able and is expected to bring significant benefits to society and economics in 6G.It also forms some evolution trends for next-generation co...The further integration of telecommunications and industry has been consider⁃able and is expected to bring significant benefits to society and economics in 6G.It also forms some evolution trends for next-generation communication systems,including further rises in machine-type communications(MTC),uplink-dominated systems,and decentral⁃ized structures.However,the existing access protocols are not friendly to these trends.This paper analyzes the problems of existing access protocols and provides novel access technologies to solve them.These technologies include contention-based non-orthogonal multiple access(NOMA),data features,enhanced pilot design and successive interference cancellation(SIC)of diversity.With these key enablers,truly grant-free access can be re⁃alized,and some potential modifications of protocols are then analyzed.Finally,this paper uses massive and critical scenarios in digital transformations to show the great necessity of introducing novel access technologies into future communication protocols.展开更多
At the Winter Olympic Games held in CalgaryiR CSR8d8I ChiR6S6 sthl6t6 Li YSR WOR 8 go旧 i6d8Ifor short－t旧oh speed skating、The following day aposter entitled”Magic Dragon Soaring1withva旧ntand he巾KU pZcturedon氏 w...At the Winter Olympic Games held in CalgaryiR CSR8d8I ChiR6S6 sthl6t6 Li YSR WOR 8 go旧 i6d8Ifor short－t旧oh speed skating、The following day aposter entitled”Magic Dragon Soaring1withva旧ntand he巾KU pZcturedon氏 wasd【spoayedIn local streetsand fan铭．展开更多
基金supported by the National Natural Science Foundation of China under Grant No.62271043Ministry of Education of China under Grant No.8091B032123Beijing Natural Science Foundation under Grant No.L212029。
文摘Radar cross section(RCS)plays a critical role in modeling target scattering characteristics and enhancing the precision of target detection and localization in integrated sensing and communication(ISAC)systems.This paper investigates the human body RCS at 26 GHz via multiangle channel measurements under different clothing conditions.Based on calibrated electromagnetic(EM)parameters,the RCS characteristics of the human body in far-field conditions are analyzed using ray-tracing(RT)simulations.Some suggestions for the design of ISAC systems are also discussed.The results provide a solid theoretical foundation and practical reference for the modeling of target scattering characteristics for ISAC channels.
基金supported by the ZTE Industry⁃University⁃Institute Cooperation Funds under Grant No.HC⁃CN⁃20201116001.
文摘Unsourced random access(URA)is a new perspective of massive access which aims at supporting numerous machine-type users.With the appearance of carrier frequency offset(CFO),joint activity detection and channel estimation,which is vital for multiple-input and multiple-output URA,is a challenging task.To handle the phase corruption of channel measurements under CFO,a novel compressed sensing algorithm is proposed,leveraging the parametric bilinear generalized approximate message passing framework with a Markov chain support model that captures the block sparsity structure of the considered angular domain channel.An uncoupled transmission scheme is proposed to reduce system complexity,where slot-emitted messages are reorganized relying on clustering unique user channels.Simulation results reveal that the proposed transmission design for URA under CFO outperforms other potential methods.
基金supported by ZTE Industry-University-Institute Cooperation Funds under Grant No.HC-CN-20220622006。
文摘With the emergence of the 6G technology,integrated sensing and communication(ISAC)has become a hot-spot vertical application.The low-altitude scenario is considered to be a significant use case of the ISAC.However,the existing channel model is hard to meet the demands of the sensing function.The radar-cross-section(RCS)is a critical feature for the sensing part,while accurate RCS data for the typical frequency band of ISAC are still lacking.Therefore,this paper conducts measurements and analysis of the RCS data of the unmanned aerial vehicles(UAVs)under multiple poses and angles in real flying conditions.The echo from a UAV is acquired in an anechoic chamber,and the RCS values are calculated.The results of different flying attitudes are analyzed,providing RCS features for the ISAC applications.
文摘针对高速铁路(简称:高铁)动车组部件故障诊断和预测的业务需求,依托动车组故障预测与健康管理(PHM,Prognostic and Health Management)系统,在基于人工智能的高铁动车组智能运营维护(简称:运维)算法研究平台中构建高铁动车组智能运维数据分析系统。介绍了高铁动车组智能运维算法研究平台的架构,以及高铁动车组智能运维数据分析系统的数据处理流程和关键算法。并以高铁动车组客室空调为例,选取客室空调相关传感器数据进行数据分析,得到影响客室空调健康状况的特征,并对聚类结果进行健康度数据标注,作为客室空调健康评估模型开发的基础。
基金supported by the Key-Area Research and Development Program of Guangdong Province under Grant 2019B010157002the National Key Research and Development Program of China under grant 2020YFB1807202.
文摘In this paper,a contention-based connection-free transmission scheme is proposed to meet the stringent requirements of ultra-reliability and low-latency for critical machine-type communication(cMTC).To improve reliability,we design multiple independent sparse orthogonal pilots(MISOP)to significantly reduce the probability of pilot collision to the order of 10^(−5).Besides,the advancements of massive MIMO(mMIMO)are exploited to further enhance the reliability.To achieve low latency,connection-free slot-based one-shot transmission without retransmissions is adopted.On the receiver side,single round of multi-user detection(MUD)without interference cancellation(IC)can reduce the processing delay.The imprecise synchronization between cMTC device and the gNB in connection-free transmission,e.g.,time and frequency offsets,are also considered.The simulation results shows that the proposed scheme can well satisfy the ambitious requirements of cMTC,and has the potential applications in supporting massive cMTC devices in 6G.
文摘The further integration of telecommunications and industry has been consider⁃able and is expected to bring significant benefits to society and economics in 6G.It also forms some evolution trends for next-generation communication systems,including further rises in machine-type communications(MTC),uplink-dominated systems,and decentral⁃ized structures.However,the existing access protocols are not friendly to these trends.This paper analyzes the problems of existing access protocols and provides novel access technologies to solve them.These technologies include contention-based non-orthogonal multiple access(NOMA),data features,enhanced pilot design and successive interference cancellation(SIC)of diversity.With these key enablers,truly grant-free access can be re⁃alized,and some potential modifications of protocols are then analyzed.Finally,this paper uses massive and critical scenarios in digital transformations to show the great necessity of introducing novel access technologies into future communication protocols.
文摘At the Winter Olympic Games held in CalgaryiR CSR8d8I ChiR6S6 sthl6t6 Li YSR WOR 8 go旧 i6d8Ifor short－t旧oh speed skating、The following day aposter entitled”Magic Dragon Soaring1withva旧ntand he巾KU pZcturedon氏 wasd【spoayedIn local streetsand fan铭．
