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
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
随着科技发展,配电网自动化水平显著提高,基于通用分组无线业务(General Packet Radio Service,GPRS)的通信技术凭借高效、可靠、高可用性,成为配电网自动化通信系统中的关键部分。文章设计一种基于GPRS的配电网自动化通信系统终端,以...随着科技发展,配电网自动化水平显著提高,基于通用分组无线业务(General Packet Radio Service,GPRS)的通信技术凭借高效、可靠、高可用性,成为配电网自动化通信系统中的关键部分。文章设计一种基于GPRS的配电网自动化通信系统终端,以提高配电网的运行效率和可靠性。采用GPRS通信技术,系统可以实现高速、稳定的数据传输,为配电网的自动化管理提供有力支持。展开更多
针对配电网线路故障难以准确定位、运维响应滞后等问题,设计一种具备自供电和双向通信功能的智能化配电网线路运行状态监测系统。系统利用小电流自取电和太阳能双重供电保障终端持续在线,结合高精度电流和对地电场监测,通过通用分组无...针对配电网线路故障难以准确定位、运维响应滞后等问题,设计一种具备自供电和双向通信功能的智能化配电网线路运行状态监测系统。系统利用小电流自取电和太阳能双重供电保障终端持续在线,结合高精度电流和对地电场监测,通过通用分组无线服务(General Packet Radio Service,GPRS)实现数据远程上传。监测主站可对采集数据进行波形分析与故障定位,完成故障线路精准选线与定位。测试结果表明,该系统可大幅提升配电网线路故障判断的准确性与响应速度,具有较高的工程应用价值。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.
文摘随着科技发展,配电网自动化水平显著提高,基于通用分组无线业务(General Packet Radio Service,GPRS)的通信技术凭借高效、可靠、高可用性,成为配电网自动化通信系统中的关键部分。文章设计一种基于GPRS的配电网自动化通信系统终端,以提高配电网的运行效率和可靠性。采用GPRS通信技术,系统可以实现高速、稳定的数据传输,为配电网的自动化管理提供有力支持。
文摘针对配电网线路故障难以准确定位、运维响应滞后等问题,设计一种具备自供电和双向通信功能的智能化配电网线路运行状态监测系统。系统利用小电流自取电和太阳能双重供电保障终端持续在线,结合高精度电流和对地电场监测,通过通用分组无线服务(General Packet Radio Service,GPRS)实现数据远程上传。监测主站可对采集数据进行波形分析与故障定位,完成故障线路精准选线与定位。测试结果表明,该系统可大幅提升配电网线路故障判断的准确性与响应速度,具有较高的工程应用价值。
