The fifth generation (5G) New Radio (NR) has been developed to provide significant improvements in scalability, flexibility, and efficiency in terms of power usage and spectrum as well. To meet the 5G vision, service ...The fifth generation (5G) New Radio (NR) has been developed to provide significant improvements in scalability, flexibility, and efficiency in terms of power usage and spectrum as well. To meet the 5G vision, service and performance requirements, various candidate technologies have been proposed in 5G new radio;some are extensions of 4G and, some are developed explicitly for 5G. These candidate technologies include non-Orthogonal Multiple Access (NOMA), and Low Density Parity Check (LDPC) channel coding. In addition, deploying software defined radio (SDR) instead of traditional hardware modules. In this paper we build an open source SDR-based platform to realize the transceiver of the physical downlink shared channel (PDSCH) of 5G NR according to Third Generation Partnership Project (3GPP) standard. We provide a prototype for pairing between two 5G users using NOMA technique. In addition, a suitable design for LDPC channel coding is performed. The intermediate stage of segmentation, rate matching and interleaving are also carried out in order to realize a standard NR frame. Finally, experiments are carried out in both simulation and real time scenario on the designed 5G NR for the purpose of system performance evaluation, and to demonstrate its potential in meeting future 5G mobile network challenges.展开更多
This paper provides an overview of the physical layer of 5G new radio(NR) system. A general framework of 5G NR is first de-scribed, which glues together various key components, all of them helping to fulfill the requi...This paper provides an overview of the physical layer of 5G new radio(NR) system. A general framework of 5G NR is first de-scribed, which glues together various key components, all of them helping to fulfill the requirements of three major deploymentscenarios: enhanced mobile broadband(e MBB), ultra-reliable low latency communications(URLLC) and massive machine typecommunications(m MTC). Then, several key components of the 5G NR physical layer are discussed in more detail that includemultiple access, channel coding, multiple antennas, frame structures, and initial access. The two-phase approach of NR is also dis-cussed and the key technologies expected to be specified in Phase 1 and Phase 2 are listed.展开更多
在5G-NR下行链路侦收中对SIB(System Information Block)进行码流提取与信令解析是后续5G终端随机接入过程分析的重要前提,同时也是实施5G通信终端管控的必要过程。针对这一需求,采用包络检波与时频分析等方法,在快速完成SSB(Synchroniz...在5G-NR下行链路侦收中对SIB(System Information Block)进行码流提取与信令解析是后续5G终端随机接入过程分析的重要前提,同时也是实施5G通信终端管控的必要过程。针对这一需求,采用包络检波与时频分析等方法,在快速完成SSB(Synchronization Signal Block)突发集配置模式判断后,利用主信息块的信令快速寻找到对应的CORESET(Control Resource SET),并通过解析CORESET中承载的下行控制信息定位出携带SIB的物理下行共享信道时频位置,最终经过解调解码提取出SIB的码流与信令。最后针对中国电信与中国移动5G基站采集下行信号,成功提取SIB的码流与信令,验证所用方法的有效性,从而为后续5G终端管控设备的研制提供重要参考。展开更多
In the fifth-generation new radio(5G-NR) high-speed railway(HSR) downlink,a deep learning(DL) based Doppler frequency offset(DFO) estimation scheme is proposed by using the back propagation neural network(BPNN).The pr...In the fifth-generation new radio(5G-NR) high-speed railway(HSR) downlink,a deep learning(DL) based Doppler frequency offset(DFO) estimation scheme is proposed by using the back propagation neural network(BPNN).The proposed method mainly includes pre-training,training,and estimation phases,where the pre-training and training belong to the off-line stage,and the estimation is the online stage.To reduce the performance loss caused by the random initialization,the pre-training method is employed to acquire a desirable initialization,which is used as the initial parameters of the training phase.Moreover,the initial DFO estimation is used as input along with the received pilots to further improve the estimation accuracy.Different from the training phase,the initial DFO estimation in pre-training phase is obtained by the data and pilot symbols.Simulation results show that the mean squared error(MSE) performance of the proposed method is better than those of the available algorithms,and it has acceptable computational complexity.展开更多
In this paper,the concept of grantfree non-orthogonal multiple access(NOMA) for uplink data transmission is elaborated.NOMA in combination with grant-free can be applied to ultra reliability low latency communication(...In this paper,the concept of grantfree non-orthogonal multiple access(NOMA) for uplink data transmission is elaborated.NOMA in combination with grant-free can be applied to ultra reliability low latency communication(URLLC),massive machine type communication(m MTC),enhanced mobile broadband(e MBB) small packet and two-step random-access channel(RACH) scenarios.The advantages of grant-free NOMA are low latency and signaling overhead,high access capability and efficient resource utilization.Candidate uplink NOMA schemes are summarized and preliminary comparison among a subset of schemes are presented.Furthermore,design aspects for grant-free NOMA are discussed,with special notes on particular issues such as blind UE identification and transmitter/receiver(Tx/Rx) impairments in realistic deployment.展开更多
为应对地铁无线专网多网并存,单个网络无法综合承载的情况,分析了地铁应用系统的通信需求和地铁专网综合承载的现状,提出了5G新空口(5G NR,5G New Radio)地铁专网综合承载方案,重点研究了基于5G NR网络切片的业务适配和网络隔离方案。...为应对地铁无线专网多网并存,单个网络无法综合承载的情况,分析了地铁应用系统的通信需求和地铁专网综合承载的现状,提出了5G新空口(5G NR,5G New Radio)地铁专网综合承载方案,重点研究了基于5G NR网络切片的业务适配和网络隔离方案。为满足地铁复杂的应用需求和安全隔离要求,提出了5G NR网络切片的扩展即双层网络切片方法。展开更多
For 5G new radio(NR),there are two frequency bands:Frequency Range 1(FR‐1)(low frequency)and Frequency Range 2(FR‐2)(millimeter‐wave frequency).Millimeter‐wave has been officially utilized in mobile applications.T...For 5G new radio(NR),there are two frequency bands:Frequency Range 1(FR‐1)(low frequency)and Frequency Range 2(FR‐2)(millimeter‐wave frequency).Millimeter‐wave has been officially utilized in mobile applications.The wide bandwidth is the key for the millimeter-wave band.However,higher loss has become the major challenge for the wide use of this frequency range.Antenna array and beamforming technologies have been introduced to resolve the path loss and coverage problems.The key design considerations of the beamforming antenna array are low loss,compact system and small size.Antenna-in-package(AiP)has become the most attractive technology for millimeter-wave front-end system.For the design of AiP,many parameters such as RF transition,material and heat need to be considered and designed properly.The Over‐the‐Air(OTA)testing technology is also very critical for AiP mass production.In this paper,the detail of AiP design and new OTA testing technology are discussed and demonstrated.展开更多
为提高列车和人员的定位精度,针对智能铁路高速和低速场景下的定位需求,结合基于正交频分复用技术的全新空口设计的全球性第5代移动通信技术标准(简称:5G新空口)(5G NR)定位技术,提出基于5G NR的上行和下行定位解决方案。基于到达时间...为提高列车和人员的定位精度,针对智能铁路高速和低速场景下的定位需求,结合基于正交频分复用技术的全新空口设计的全球性第5代移动通信技术标准(简称:5G新空口)(5G NR)定位技术,提出基于5G NR的上行和下行定位解决方案。基于到达时间差的定位技术原理,通过选用下行到达时间差(DL-TDOA,Downlink Time Difference of Arrival)定位法和上行到达时间差(UL-TDOA,Uplink Time Difference of Arrival)定位法,设计了上下行定位参考信号、时间测量值反馈及定位流程,保证了智能铁路低速场景下满足第3代合作伙伴计划技术报告(3GPP TR)所定义的米级定位精度,并提出了高速场景及隧道场景下的潜在定位增强技术,为智能铁路多场景定位提供技术参考。展开更多
The 5G communication systems are widely established for highspeed data processing to meet users demands.The 5G New Radio(NR)communications comprise a network of ultra-low latency,high processing speeds,high throughput...The 5G communication systems are widely established for highspeed data processing to meet users demands.The 5G New Radio(NR)communications comprise a network of ultra-low latency,high processing speeds,high throughput and rapid synchronization with a time frame of 10 ms.Synchronization between User Equipment(UE)and 5G base station known as gNB is a fundamental procedure in a cellular system and it is performed by a synchronization signal.In 5G NR system,Primary Synchronization Signal(PSS)and Secondary Synchronization Signal(SSS)are used to detect the best serving base station with the help of a cell search procedure.The paper aims to determine the Physical Cell Identity(PCI)by using primary synchronization and secondary synchronization blocks.The PSS and SSS detection for finding PCI is implemented on Zynq-7000 series Field Programmable Gate Arrays(FPGA)board.FPGA are reconfigurable devices and easy to design complex circuits at high frequencies.The proposed architecture employs Primary Synchronization Signal(PSS)and Secondary Synchronization Signal(SSS)detection aims with high speed and low power consumption.The synchronization blocks have been designed and the synthesized design block is implemented on the Zynq-7000 series Zed board with a maximum operating clock frequency of 1 GHz.展开更多
文摘The fifth generation (5G) New Radio (NR) has been developed to provide significant improvements in scalability, flexibility, and efficiency in terms of power usage and spectrum as well. To meet the 5G vision, service and performance requirements, various candidate technologies have been proposed in 5G new radio;some are extensions of 4G and, some are developed explicitly for 5G. These candidate technologies include non-Orthogonal Multiple Access (NOMA), and Low Density Parity Check (LDPC) channel coding. In addition, deploying software defined radio (SDR) instead of traditional hardware modules. In this paper we build an open source SDR-based platform to realize the transceiver of the physical downlink shared channel (PDSCH) of 5G NR according to Third Generation Partnership Project (3GPP) standard. We provide a prototype for pairing between two 5G users using NOMA technique. In addition, a suitable design for LDPC channel coding is performed. The intermediate stage of segmentation, rate matching and interleaving are also carried out in order to realize a standard NR frame. Finally, experiments are carried out in both simulation and real time scenario on the designed 5G NR for the purpose of system performance evaluation, and to demonstrate its potential in meeting future 5G mobile network challenges.
文摘This paper provides an overview of the physical layer of 5G new radio(NR) system. A general framework of 5G NR is first de-scribed, which glues together various key components, all of them helping to fulfill the requirements of three major deploymentscenarios: enhanced mobile broadband(e MBB), ultra-reliable low latency communications(URLLC) and massive machine typecommunications(m MTC). Then, several key components of the 5G NR physical layer are discussed in more detail that includemultiple access, channel coding, multiple antennas, frame structures, and initial access. The two-phase approach of NR is also dis-cussed and the key technologies expected to be specified in Phase 1 and Phase 2 are listed.
文摘在5G-NR下行链路侦收中对SIB(System Information Block)进行码流提取与信令解析是后续5G终端随机接入过程分析的重要前提,同时也是实施5G通信终端管控的必要过程。针对这一需求,采用包络检波与时频分析等方法,在快速完成SSB(Synchronization Signal Block)突发集配置模式判断后,利用主信息块的信令快速寻找到对应的CORESET(Control Resource SET),并通过解析CORESET中承载的下行控制信息定位出携带SIB的物理下行共享信道时频位置,最终经过解调解码提取出SIB的码流与信令。最后针对中国电信与中国移动5G基站采集下行信号,成功提取SIB的码流与信令,验证所用方法的有效性,从而为后续5G终端管控设备的研制提供重要参考。
基金Supported by the National Science Foundation Program of Jiangsu Province(No.BK20191378)the National Science Research Project of Jiangsu Higher Education Institutions(No.18KJB510034)+1 种基金the 11th Batch of China Postdoctoral Science Fund Special Funding Project(No.2018T110530)the National Natural Science Foundation of China(No.61771255)。
文摘In the fifth-generation new radio(5G-NR) high-speed railway(HSR) downlink,a deep learning(DL) based Doppler frequency offset(DFO) estimation scheme is proposed by using the back propagation neural network(BPNN).The proposed method mainly includes pre-training,training,and estimation phases,where the pre-training and training belong to the off-line stage,and the estimation is the online stage.To reduce the performance loss caused by the random initialization,the pre-training method is employed to acquire a desirable initialization,which is used as the initial parameters of the training phase.Moreover,the initial DFO estimation is used as input along with the received pilots to further improve the estimation accuracy.Different from the training phase,the initial DFO estimation in pre-training phase is obtained by the data and pilot symbols.Simulation results show that the mean squared error(MSE) performance of the proposed method is better than those of the available algorithms,and it has acceptable computational complexity.
文摘In this paper,the concept of grantfree non-orthogonal multiple access(NOMA) for uplink data transmission is elaborated.NOMA in combination with grant-free can be applied to ultra reliability low latency communication(URLLC),massive machine type communication(m MTC),enhanced mobile broadband(e MBB) small packet and two-step random-access channel(RACH) scenarios.The advantages of grant-free NOMA are low latency and signaling overhead,high access capability and efficient resource utilization.Candidate uplink NOMA schemes are summarized and preliminary comparison among a subset of schemes are presented.Furthermore,design aspects for grant-free NOMA are discussed,with special notes on particular issues such as blind UE identification and transmitter/receiver(Tx/Rx) impairments in realistic deployment.
文摘For 5G new radio(NR),there are two frequency bands:Frequency Range 1(FR‐1)(low frequency)and Frequency Range 2(FR‐2)(millimeter‐wave frequency).Millimeter‐wave has been officially utilized in mobile applications.The wide bandwidth is the key for the millimeter-wave band.However,higher loss has become the major challenge for the wide use of this frequency range.Antenna array and beamforming technologies have been introduced to resolve the path loss and coverage problems.The key design considerations of the beamforming antenna array are low loss,compact system and small size.Antenna-in-package(AiP)has become the most attractive technology for millimeter-wave front-end system.For the design of AiP,many parameters such as RF transition,material and heat need to be considered and designed properly.The Over‐the‐Air(OTA)testing technology is also very critical for AiP mass production.In this paper,the detail of AiP design and new OTA testing technology are discussed and demonstrated.
文摘为提高列车和人员的定位精度,针对智能铁路高速和低速场景下的定位需求,结合基于正交频分复用技术的全新空口设计的全球性第5代移动通信技术标准(简称:5G新空口)(5G NR)定位技术,提出基于5G NR的上行和下行定位解决方案。基于到达时间差的定位技术原理,通过选用下行到达时间差(DL-TDOA,Downlink Time Difference of Arrival)定位法和上行到达时间差(UL-TDOA,Uplink Time Difference of Arrival)定位法,设计了上下行定位参考信号、时间测量值反馈及定位流程,保证了智能铁路低速场景下满足第3代合作伙伴计划技术报告(3GPP TR)所定义的米级定位精度,并提出了高速场景及隧道场景下的潜在定位增强技术,为智能铁路多场景定位提供技术参考。
文摘The 5G communication systems are widely established for highspeed data processing to meet users demands.The 5G New Radio(NR)communications comprise a network of ultra-low latency,high processing speeds,high throughput and rapid synchronization with a time frame of 10 ms.Synchronization between User Equipment(UE)and 5G base station known as gNB is a fundamental procedure in a cellular system and it is performed by a synchronization signal.In 5G NR system,Primary Synchronization Signal(PSS)and Secondary Synchronization Signal(SSS)are used to detect the best serving base station with the help of a cell search procedure.The paper aims to determine the Physical Cell Identity(PCI)by using primary synchronization and secondary synchronization blocks.The PSS and SSS detection for finding PCI is implemented on Zynq-7000 series Field Programmable Gate Arrays(FPGA)board.FPGA are reconfigurable devices and easy to design complex circuits at high frequencies.The proposed architecture employs Primary Synchronization Signal(PSS)and Secondary Synchronization Signal(SSS)detection aims with high speed and low power consumption.The synchronization blocks have been designed and the synthesized design block is implemented on the Zynq-7000 series Zed board with a maximum operating clock frequency of 1 GHz.
