We demonstrate a simultaneous transmission of time-frequency and data over a 160-km urban business network in Shanghai.The signals are transmitted through a cascaded optical link consisting of 48 km and 32 km,which ar...We demonstrate a simultaneous transmission of time-frequency and data over a 160-km urban business network in Shanghai.The signals are transmitted through a cascaded optical link consisting of 48 km and 32 km,which are connected by an optical relay.The metrological signals are inserted into the communication network using dense wavelength division multiplexing.The influence of the interference between different signals has been discussed.The experimental results demonstrate that the radio frequency(RF)instability can reach 2.1×10^(-14)at 1 s and 2.3×10^(-17)at 10,000 s,and the time interval transfer of one pulse per second(1 PPS)signal with less than 10 ps at 1 s is obtained.This work paves the way for the widespread dissemination of ultra-stable time and frequency signals over the communication networks.展开更多
In this paper,we propose a controlled quantum N-party simultaneous direct communication protocolwith single-qubit measurements.Many users can simultaneously exchange their secret messages in a set of devices withthe c...In this paper,we propose a controlled quantum N-party simultaneous direct communication protocolwith single-qubit measurements.Many users can simultaneously exchange their secret messages in a set of devices withthe control of a supervisor.The eavesdropper's commonly used attacks can be detected through two security checkingprocesses.展开更多
A universal and general quantum simultaneous secret distribution(QSSD)protocol is put forward based on the properties of the one-dimensional high-level cluster states,in which one sender dispatches different high-leve...A universal and general quantum simultaneous secret distribution(QSSD)protocol is put forward based on the properties of the one-dimensional high-level cluster states,in which one sender dispatches different high-level classical secret messages to many users at the same time.Due to the idea of quantum dense coding,the sender can send different two-dit classical messages(two d-level classical numbers)to different receivers simultaneously by using a one-dimensional d-level cluster state,which means that the information capacity is up to the maximal.To estimate the security of quantum channels,a new eavesdropping check strategy is put forward.Meanwhile,a new attack model,the general individual attack is proposed and analyzed.It is shown that the new eavesdropping check strategy can effectively prevent the traditional attacks including the general individual attack.In addition,multiparty quantum secret report(MQSR,the same as quantum simultaneous secret submission(QSSS))in which different users submit their different messages to one user simultaneously can be gotten if the QSSD protocol is changed a little.展开更多
From a circuit implementation perspective,this paper presents a brief overview of simultaneous wireless information and power transmission(SWIPT).By using zero-power batteryless wireless sensors,SWIPT mixes wireless p...From a circuit implementation perspective,this paper presents a brief overview of simultaneous wireless information and power transmission(SWIPT).By using zero-power batteryless wireless sensors,SWIPT mixes wireless power transmission with wireless communications to allow the truly practical implementation of the Internet of Things as well as many other applications.In this paper,technical backgrounds,problem formation,state-of-the-art solutions,circuit implementation examples,and system integrations of SWIPT are presented.展开更多
Physical layer security transmission issue in simultaneous wireless information and power transfer(SWIPT)relay network with multiple eavesdropers is investigated in this paper.A novel cooperative beamforming algorithm...Physical layer security transmission issue in simultaneous wireless information and power transfer(SWIPT)relay network with multiple eavesdropers is investigated in this paper.A novel cooperative beamforming algorithm is proposed to balance performance of cooperative jamming method and zero-forcing method.Using location prior information of eavesdropper,the proposed method imposes zero-forcing constraints on the capable eavesdropper and cooperative jamming on remaining weak eavesdropper,respectively.Compared with classical cooperative jamming or zero-forcing methods,the proposed method can compromise computational complexity and secrecy rate.Performance of the method is verified by simulation experiments.展开更多
To improve the link efficiency and decrease the payloads in space explorations, a novel simultaneous communication and ranging method based on x-ray communication（XCOM） is proposed in this paper. A delicate signal s...To improve the link efficiency and decrease the payloads in space explorations, a novel simultaneous communication and ranging method based on x-ray communication（XCOM） is proposed in this paper. A delicate signal symbol structure is utilized to achieve simultaneous data transmission and range measurement. With the designed symbol structure, the ranging information is imbedded into the communication signal and transmitted with it simultaneously. The range measurement is realized by the two-way transmission of the range information. To illustrate the proposed method, firstly, the principle of the method is introduced and the signal processing procedure is presented. Then, the performance of the proposed method is analyzed theoretically in various aspects, including the acquisition probability, the bit error rate, the ranging jitter,etc. Besides, numerical experiments are conducted to verify the proposed method and evaluate the system performance.The simulation results show that the proposed method is feasible and that the system performance is influenced by the parameters concerning the signal symbol structure. Compared with the previous methods, the proposed method improves the link efficiency and is beneficial for system miniaturization and integration, which could provide a potential option for future deep space explorations.展开更多
针对中国北斗比GPS等其他导航系统独有的短报文双向通信功能,研发了适配北斗短报文信道的600 bit/s声码器。声码器采用正弦激励线性预测(sinusoidal excitation linear prediction,SELP)算法,实现了通信质量清晰的语音通信,并进一步设...针对中国北斗比GPS等其他导航系统独有的短报文双向通信功能,研发了适配北斗短报文信道的600 bit/s声码器。声码器采用正弦激励线性预测(sinusoidal excitation linear prediction,SELP)算法,实现了通信质量清晰的语音通信,并进一步设计了一种处理定位信息的坐标压缩算法,为语音编码数据提供了更大的传输空间。基于以上研究,实现了仅用北斗导航系统完成双向保密语音和定位同传的通信系统。该系统首先利用语音转换程序将声码器编解码模块获取的语音编码数据转换为北斗短报文数据格式;然后利用语音编码解析程序与经纬度解析程序从北斗短报文数据中解析出语音编码与位置信息;最后,在北斗短报文收发器上验证了语音通信与定位传输实验效果,主观MOS测试评分表明该研究为北斗短报文语音通信实用化铺平了道路。展开更多
基金supported by the National Key Research and Development Program of China(No.2020YFB0408300)the National Natural Science Foundation of China(No.62175246)+1 种基金the Natural Science Foundation of Shanghai(No.22ZR1471100)the Youth Innovation Promotion Association of the Chinese Academy of Sciences(No.YIPA2021244)。
文摘We demonstrate a simultaneous transmission of time-frequency and data over a 160-km urban business network in Shanghai.The signals are transmitted through a cascaded optical link consisting of 48 km and 32 km,which are connected by an optical relay.The metrological signals are inserted into the communication network using dense wavelength division multiplexing.The influence of the interference between different signals has been discussed.The experimental results demonstrate that the radio frequency(RF)instability can reach 2.1×10^(-14)at 1 s and 2.3×10^(-17)at 10,000 s,and the time interval transfer of one pulse per second(1 PPS)signal with less than 10 ps at 1 s is obtained.This work paves the way for the widespread dissemination of ultra-stable time and frequency signals over the communication networks.
基金the Key Program of National Natural Science Foundation of China under Grant No.10534030
文摘In this paper,we propose a controlled quantum N-party simultaneous direct communication protocolwith single-qubit measurements.Many users can simultaneously exchange their secret messages in a set of devices withthe control of a supervisor.The eavesdropper's commonly used attacks can be detected through two security checkingprocesses.
基金This work was supported by the National Natural Science Foundation of China under Grant No.61871120the Natural Science Foundation of Jiangsu Province of China under Grant No.BK20191259+1 种基金the Six Talent Peaks Project of Jiangsu Province of China under Grant No.XYDXX-003the Fundamental Research Funds for the Central Universities of China under Grant No.2242020K40046.
文摘A universal and general quantum simultaneous secret distribution(QSSD)protocol is put forward based on the properties of the one-dimensional high-level cluster states,in which one sender dispatches different high-level classical secret messages to many users at the same time.Due to the idea of quantum dense coding,the sender can send different two-dit classical messages(two d-level classical numbers)to different receivers simultaneously by using a one-dimensional d-level cluster state,which means that the information capacity is up to the maximal.To estimate the security of quantum channels,a new eavesdropping check strategy is put forward.Meanwhile,a new attack model,the general individual attack is proposed and analyzed.It is shown that the new eavesdropping check strategy can effectively prevent the traditional attacks including the general individual attack.In addition,multiparty quantum secret report(MQSR,the same as quantum simultaneous secret submission(QSSS))in which different users submit their different messages to one user simultaneously can be gotten if the QSSD protocol is changed a little.
基金FCT/MCTES through national funds and EU funds under the project UIDB/50008/2020⁃UIDP/50008/2020Lisboa 2020 Programme,Centro 2020 programme,Portugal 2020,Euro⁃pean Union,through the European Social Fund who sup⁃ported LISBOA-05-3559-FSE-000007 and CENTRO-04-3559-FSE-000094 operations as well as to Fundação para a Ciência e Tecnologia(FCT)and Agência Nacional de Inovação(ANI).
文摘From a circuit implementation perspective,this paper presents a brief overview of simultaneous wireless information and power transmission(SWIPT).By using zero-power batteryless wireless sensors,SWIPT mixes wireless power transmission with wireless communications to allow the truly practical implementation of the Internet of Things as well as many other applications.In this paper,technical backgrounds,problem formation,state-of-the-art solutions,circuit implementation examples,and system integrations of SWIPT are presented.
基金the National Natural Science Foundation of China(No.61771006,61976080)the Key Research and Development Projects in Henan Province of China(No.192102210254)+1 种基金the Key Research Projects of University in Henan Province of China(No.19A413006)the First-class Discipline Training Foundation of Henan University(No.2018YLTD04).
文摘Physical layer security transmission issue in simultaneous wireless information and power transfer(SWIPT)relay network with multiple eavesdropers is investigated in this paper.A novel cooperative beamforming algorithm is proposed to balance performance of cooperative jamming method and zero-forcing method.Using location prior information of eavesdropper,the proposed method imposes zero-forcing constraints on the capable eavesdropper and cooperative jamming on remaining weak eavesdropper,respectively.Compared with classical cooperative jamming or zero-forcing methods,the proposed method can compromise computational complexity and secrecy rate.Performance of the method is verified by simulation experiments.
基金Project supported by the National Natural Science Foundation of China(Grant Nos.61172138 and 61401340)the Research Fund for the Doctoral Program of Higher Education of China(Grant No.20130203120004)the Fundamental Research Funds for the Central Universities,China(Grant Nos.201413B,201412B,and JB141303)
文摘To improve the link efficiency and decrease the payloads in space explorations, a novel simultaneous communication and ranging method based on x-ray communication（XCOM） is proposed in this paper. A delicate signal symbol structure is utilized to achieve simultaneous data transmission and range measurement. With the designed symbol structure, the ranging information is imbedded into the communication signal and transmitted with it simultaneously. The range measurement is realized by the two-way transmission of the range information. To illustrate the proposed method, firstly, the principle of the method is introduced and the signal processing procedure is presented. Then, the performance of the proposed method is analyzed theoretically in various aspects, including the acquisition probability, the bit error rate, the ranging jitter,etc. Besides, numerical experiments are conducted to verify the proposed method and evaluate the system performance.The simulation results show that the proposed method is feasible and that the system performance is influenced by the parameters concerning the signal symbol structure. Compared with the previous methods, the proposed method improves the link efficiency and is beneficial for system miniaturization and integration, which could provide a potential option for future deep space explorations.
文摘针对中国北斗比GPS等其他导航系统独有的短报文双向通信功能,研发了适配北斗短报文信道的600 bit/s声码器。声码器采用正弦激励线性预测(sinusoidal excitation linear prediction,SELP)算法,实现了通信质量清晰的语音通信,并进一步设计了一种处理定位信息的坐标压缩算法,为语音编码数据提供了更大的传输空间。基于以上研究,实现了仅用北斗导航系统完成双向保密语音和定位同传的通信系统。该系统首先利用语音转换程序将声码器编解码模块获取的语音编码数据转换为北斗短报文数据格式;然后利用语音编码解析程序与经纬度解析程序从北斗短报文数据中解析出语音编码与位置信息;最后,在北斗短报文收发器上验证了语音通信与定位传输实验效果,主观MOS测试评分表明该研究为北斗短报文语音通信实用化铺平了道路。
