Performance analysis of an asynchronous frequency hopping packet radio network and numerical results are given. The network has mixed traffic, one type of packet needs an Acknowledgement(Ack), the other type does not ...Performance analysis of an asynchronous frequency hopping packet radio network and numerical results are given. The network has mixed traffic, one type of packet needs an Acknowledgement(Ack), the other type does not need, the background of such a network is tactical missile systems. A reasonable network model is given, based on which the effect of various parameters under multiaccess interference is investigated. The performance curves of throughput and average packet delay is given in this paper.展开更多
A novel joint optimization strategy for the secondary user( SU) was proposed to consider the short-term and long-term video transmissions over distributed cognitive radio networks( DCRNs).Since the long-term video tra...A novel joint optimization strategy for the secondary user( SU) was proposed to consider the short-term and long-term video transmissions over distributed cognitive radio networks( DCRNs).Since the long-term video transmission consisted of a series of shortterm transmissions, the optimization problem in the video transmission was a composite optimization process. Firstly,considering some factors like primary user's( PU's) collision limitations,non-synchronization between SU and PU,and SU's limited buffer size, the short-term optimization problem was formulated as a mixed integer non-linear program( MINLP) to minimize the block probability of video packets. Secondly,combining the minimum packet block probability obtained in shortterm optimization and SU's constraint on hardware complexity,the partially observable Markov decision process( POMDP) framework was proposed to learn PU's statistic information over DCRNs.Moreover,based on the proposed framework,joint optimization strategy was designed to obtain the minimum packet loss rate in long-term video transmission. Numerical simulation results were provided to demonstrate validity of our strategies.展开更多
随着电力系统的智能化转型,输配电实时监测与控制的需求日益增长,通信技术在此过程中扮演着重要角色。文章详细分析公网通用分组无线服务(General Packet Radio Service,GPRS)、5G通信技术以及无线专网在输配电监测与控制中的应用,并探...随着电力系统的智能化转型,输配电实时监测与控制的需求日益增长,通信技术在此过程中扮演着重要角色。文章详细分析公网通用分组无线服务(General Packet Radio Service,GPRS)、5G通信技术以及无线专网在输配电监测与控制中的应用,并探讨这些技术存在的局限性,为电力系统的智能化转型提供坚实的理论支撑,确保电网运营的可靠性、安全性及高效性。展开更多
In the paper,we propose a framework to investigate how to effectively perform traffic flow splitting in heterogeneous wireless networks from a queue point.The average packet delay in heterogeneous wireless networks is...In the paper,we propose a framework to investigate how to effectively perform traffic flow splitting in heterogeneous wireless networks from a queue point.The average packet delay in heterogeneous wireless networks is derived in a probabilistic manner.The basic idea can be understood via treating the integrated heterogeneous wireless networks as different coupled and parallel queuing systems.The integrated network performance can approach that of one queue with maximal the multiplexing gain.For the purpose of illustrating the effectively of our proposed model,the Cellular/WLAN interworking is exploited.To minimize the average delay,a heuristic search algorithm is used to get the optimal probability of splitting traffic flow.Further,a Markov process is applied to evaluate the performance of the proposed scheme and compare with that of selecting the best network to access in terms of packet mean delay and blocking probability.Numerical results illustrate our proposed framework is effective and the flow splitting transmission can obtain more performance gain in heterogeneous wireless networks.展开更多
In last few years, several recent developments concern a new proposed techniques of communication for WSN (Wireless Sensors Network) using a complex methods and technics. This network is considered a future platform f...In last few years, several recent developments concern a new proposed techniques of communication for WSN (Wireless Sensors Network) using a complex methods and technics. This network is considered a future platform for many applications like: medical, agriculture, industrial, monitoring and others. The challenge of this work consists in proposing a new design of transceiver for WSN based on IDWPT (Inverse Discrete Wavelet Packet Transform) in emitter and DWPT (Discrete Wavelet Packet Transform) in receiver for mono and multi users using AWGN Channel. We will propose in this paper, a new concept of impulse radio communication for multiband orthogonal communication for UWB (Ultra-wideband) applications. The main objective of this work is to present a new form of pulse communication adapted to low through-put short-range applications and is scalable according to the type of use but also the number of sensors.展开更多
为提高配电网运行的可靠性,以某地区电力系统配电网为例,开展自动化技术的应用设计。引进通用分组无线服务(General Packet Radio Service,GPRS)技术,将数据终端设备(Data Terminal Equipment,DTE)由RS485串口与GPRS数据终端相连,最终由...为提高配电网运行的可靠性,以某地区电力系统配电网为例,开展自动化技术的应用设计。引进通用分组无线服务(General Packet Radio Service,GPRS)技术,将数据终端设备(Data Terminal Equipment,DTE)由RS485串口与GPRS数据终端相连,最终由GPRS数据传送终端抵达配电网数据采集与监视控制系统(Supervisory Control And Data Acquisition,SCADA)中心,实现配电网组网通信建设。将配电网在运行中的小波故障度作为参照,通过电力系统配电网运行故障诊断与特征提取,跟踪前端反馈数据,实现电力系统配电网运行数据的集成与自动化管理。实验结果证明,应用自动化技术进行电力系统配电网规划,可以降低配电网供电服务风险与故障概率。展开更多
在我国经济蓬勃发展和全球能源供应日益紧张的背景下,提升电力质量和实施节约能源的措施非常必要。国家考核电力部门时,电能损耗率不仅是关键的经济指标,还是一项用于综合评估电力系统规划、设计和经营管理水平的重要考核指标。为简化...在我国经济蓬勃发展和全球能源供应日益紧张的背景下,提升电力质量和实施节约能源的措施非常必要。国家考核电力部门时,电能损耗率不仅是关键的经济指标,还是一项用于综合评估电力系统规划、设计和经营管理水平的重要考核指标。为简化负荷点数据采集过程,开发了一种基于通用分组无线业务(General Packet Radio Service,GPRS)技术的监测系统,用于低压配电网络的线损监测,具有较好的理论意义和实际应用价值。展开更多
文摘Performance analysis of an asynchronous frequency hopping packet radio network and numerical results are given. The network has mixed traffic, one type of packet needs an Acknowledgement(Ack), the other type does not need, the background of such a network is tactical missile systems. A reasonable network model is given, based on which the effect of various parameters under multiaccess interference is investigated. The performance curves of throughput and average packet delay is given in this paper.
基金National Natural Science Foundation of China(No.61301101)
文摘A novel joint optimization strategy for the secondary user( SU) was proposed to consider the short-term and long-term video transmissions over distributed cognitive radio networks( DCRNs).Since the long-term video transmission consisted of a series of shortterm transmissions, the optimization problem in the video transmission was a composite optimization process. Firstly,considering some factors like primary user's( PU's) collision limitations,non-synchronization between SU and PU,and SU's limited buffer size, the short-term optimization problem was formulated as a mixed integer non-linear program( MINLP) to minimize the block probability of video packets. Secondly,combining the minimum packet block probability obtained in shortterm optimization and SU's constraint on hardware complexity,the partially observable Markov decision process( POMDP) framework was proposed to learn PU's statistic information over DCRNs.Moreover,based on the proposed framework,joint optimization strategy was designed to obtain the minimum packet loss rate in long-term video transmission. Numerical simulation results were provided to demonstrate validity of our strategies.
文摘随着电力系统的智能化转型,输配电实时监测与控制的需求日益增长,通信技术在此过程中扮演着重要角色。文章详细分析公网通用分组无线服务(General Packet Radio Service,GPRS)、5G通信技术以及无线专网在输配电监测与控制中的应用,并探讨这些技术存在的局限性,为电力系统的智能化转型提供坚实的理论支撑,确保电网运营的可靠性、安全性及高效性。
基金ACKNOWLEDGEMENT This work was supported by National Natural Science Foundation of China （Grant No. 61231008）, National Basic Research Program of China （973 Program） （Grant No. 2009CB320404）, Program for Changjiang Scholars and Innovative Research Team in University （Grant No. IRT0852）, and the 111 Project （Grant No. B08038）.
文摘In the paper,we propose a framework to investigate how to effectively perform traffic flow splitting in heterogeneous wireless networks from a queue point.The average packet delay in heterogeneous wireless networks is derived in a probabilistic manner.The basic idea can be understood via treating the integrated heterogeneous wireless networks as different coupled and parallel queuing systems.The integrated network performance can approach that of one queue with maximal the multiplexing gain.For the purpose of illustrating the effectively of our proposed model,the Cellular/WLAN interworking is exploited.To minimize the average delay,a heuristic search algorithm is used to get the optimal probability of splitting traffic flow.Further,a Markov process is applied to evaluate the performance of the proposed scheme and compare with that of selecting the best network to access in terms of packet mean delay and blocking probability.Numerical results illustrate our proposed framework is effective and the flow splitting transmission can obtain more performance gain in heterogeneous wireless networks.
文摘In last few years, several recent developments concern a new proposed techniques of communication for WSN (Wireless Sensors Network) using a complex methods and technics. This network is considered a future platform for many applications like: medical, agriculture, industrial, monitoring and others. The challenge of this work consists in proposing a new design of transceiver for WSN based on IDWPT (Inverse Discrete Wavelet Packet Transform) in emitter and DWPT (Discrete Wavelet Packet Transform) in receiver for mono and multi users using AWGN Channel. We will propose in this paper, a new concept of impulse radio communication for multiband orthogonal communication for UWB (Ultra-wideband) applications. The main objective of this work is to present a new form of pulse communication adapted to low through-put short-range applications and is scalable according to the type of use but also the number of sensors.
文摘为提高配电网运行的可靠性,以某地区电力系统配电网为例,开展自动化技术的应用设计。引进通用分组无线服务(General Packet Radio Service,GPRS)技术,将数据终端设备(Data Terminal Equipment,DTE)由RS485串口与GPRS数据终端相连,最终由GPRS数据传送终端抵达配电网数据采集与监视控制系统(Supervisory Control And Data Acquisition,SCADA)中心,实现配电网组网通信建设。将配电网在运行中的小波故障度作为参照,通过电力系统配电网运行故障诊断与特征提取,跟踪前端反馈数据,实现电力系统配电网运行数据的集成与自动化管理。实验结果证明,应用自动化技术进行电力系统配电网规划,可以降低配电网供电服务风险与故障概率。
文摘在我国经济蓬勃发展和全球能源供应日益紧张的背景下,提升电力质量和实施节约能源的措施非常必要。国家考核电力部门时,电能损耗率不仅是关键的经济指标,还是一项用于综合评估电力系统规划、设计和经营管理水平的重要考核指标。为简化负荷点数据采集过程,开发了一种基于通用分组无线业务(General Packet Radio Service,GPRS)技术的监测系统,用于低压配电网络的线损监测,具有较好的理论意义和实际应用价值。
