动态频谱分配应用于实际电力线通信系统面临分配策略、实时算法等诸多挑战,到目前为止还未见有公开报道。定义并设计了一个实际的基于正交频分复用(orthogonal frequency division multiplexing,OFDM)的高速窄带电力线通信系统构架,并...动态频谱分配应用于实际电力线通信系统面临分配策略、实时算法等诸多挑战,到目前为止还未见有公开报道。定义并设计了一个实际的基于正交频分复用(orthogonal frequency division multiplexing,OFDM)的高速窄带电力线通信系统构架,并提出一种适用于该系统的动态频谱分配策略和对应的实时实现算法。该算法在任一种调制方式下将子载波进行分组,并对各个子载波组的功率进行排序,选择可用的子载波组,根据速率最大化准则确定最优的调制方式并分配功率。该算法与Hughes-Hartogs算法相比,具有较低的运算复杂度和较少的信令开销,与传统的等功率分配方式相比,误码性能更好。仿真结果和实验结果证明了该算法的有效性和优越性。展开更多
随着智能电网建设的持续深入及智能双向互动概念的提出,本地信道将承载更多的数据量,基于传统的单频窄带载波通信速率相对较低,已不能满足日益增长的网络数据需求量以及传输可靠性的要求。更快速、更可靠、更安全的载波技术是将来发展...随着智能电网建设的持续深入及智能双向互动概念的提出,本地信道将承载更多的数据量,基于传统的单频窄带载波通信速率相对较低,已不能满足日益增长的网络数据需求量以及传输可靠性的要求。更快速、更可靠、更安全的载波技术是将来发展方向。基于G3-PLC的国际高速窄带标准进行研究,为适应国内的用户数量庞大、台区拓扑相当复杂、信号干扰大的载波环境对G3-PLC的适配层进行了修改,用洪泛组网算法代替6LOWPAN(IPv6 over Low power Wireless personal Area Network,基于IPv6的低功耗无线个域网)。在国内进行了实际台区测试,验证了基于OFDM(Orthogonal Frequency Division Multiplexing)的高速窄带载波具有通信速率高、突发性干扰能力强、通信可靠性高、并行传输纠错性能强等优点。展开更多
实现电力系统自动需求响应的高速窄带电力线通信(high-speed narrowband power line communication,HNPLC)系统亟需实用、高效的应用层设计来支撑各类响应服务。该文面向自动需求响应服务,定义了双向互动的HNPLC应用层协议架构,并结合...实现电力系统自动需求响应的高速窄带电力线通信(high-speed narrowband power line communication,HNPLC)系统亟需实用、高效的应用层设计来支撑各类响应服务。该文面向自动需求响应服务,定义了双向互动的HNPLC应用层协议架构,并结合系统的多分类服务需求,提出一种综合考虑数据包优先级权重、数据包传输效率和服务等待时间的基于动态优先级的应用层服务响应机制。在构建的跨层HNPLC仿真平台中验证了协议架构的合理性,且计算机仿真结果表明,提出的基于动态优先级的服务响应机制可明显提升HNPLC传输性能,满足自动需求响应的服务要求。展开更多
Narrowband radar has been successfully used for high resolution imaging of fast rotating targets by exploiting their micro-motion features.In some practical situations,however,the target image may suffer from aliasing...Narrowband radar has been successfully used for high resolution imaging of fast rotating targets by exploiting their micro-motion features.In some practical situations,however,the target image may suffer from aliasing due to the fixed pulse repetition interval(PRI)of traditional radar scheme.In this work,the random PRI signal associated with compressed sensing(CS)theory was introduced for aliasing reduction to obtain high resolution images of fast rotating targets.To circumvent the large-scale dictionary and high computational complexity problem arising from direct application of CS theory,the low resolution image was firstly generated by applying a modified generalized Radon transform on the time-frequency domain,and then the dictionary was scaled down by random undersampling as well as the atoms extraction according to those strong scattering areas of the low resolution image.The scale-down-dictionary CS(SDD-CS)processing scheme was detailed and simulation results show that the SDD-CS scheme for narrowband radar can achieve preferable images with no aliasing as well as acceptable computational cost.展开更多
文摘动态频谱分配应用于实际电力线通信系统面临分配策略、实时算法等诸多挑战,到目前为止还未见有公开报道。定义并设计了一个实际的基于正交频分复用(orthogonal frequency division multiplexing,OFDM)的高速窄带电力线通信系统构架,并提出一种适用于该系统的动态频谱分配策略和对应的实时实现算法。该算法在任一种调制方式下将子载波进行分组,并对各个子载波组的功率进行排序,选择可用的子载波组,根据速率最大化准则确定最优的调制方式并分配功率。该算法与Hughes-Hartogs算法相比,具有较低的运算复杂度和较少的信令开销,与传统的等功率分配方式相比,误码性能更好。仿真结果和实验结果证明了该算法的有效性和优越性。
文摘随着智能电网建设的持续深入及智能双向互动概念的提出,本地信道将承载更多的数据量,基于传统的单频窄带载波通信速率相对较低,已不能满足日益增长的网络数据需求量以及传输可靠性的要求。更快速、更可靠、更安全的载波技术是将来发展方向。基于G3-PLC的国际高速窄带标准进行研究,为适应国内的用户数量庞大、台区拓扑相当复杂、信号干扰大的载波环境对G3-PLC的适配层进行了修改,用洪泛组网算法代替6LOWPAN(IPv6 over Low power Wireless personal Area Network,基于IPv6的低功耗无线个域网)。在国内进行了实际台区测试,验证了基于OFDM(Orthogonal Frequency Division Multiplexing)的高速窄带载波具有通信速率高、突发性干扰能力强、通信可靠性高、并行传输纠错性能强等优点。
文摘实现电力系统自动需求响应的高速窄带电力线通信(high-speed narrowband power line communication,HNPLC)系统亟需实用、高效的应用层设计来支撑各类响应服务。该文面向自动需求响应服务,定义了双向互动的HNPLC应用层协议架构,并结合系统的多分类服务需求,提出一种综合考虑数据包优先级权重、数据包传输效率和服务等待时间的基于动态优先级的应用层服务响应机制。在构建的跨层HNPLC仿真平台中验证了协议架构的合理性,且计算机仿真结果表明,提出的基于动态优先级的服务响应机制可明显提升HNPLC传输性能,满足自动需求响应的服务要求。
基金Projects(61171133,61271442)supported by the National Natural Science Foundation of ChinaProject(61025006)supported by the National Natural Science Foundation for Distinguished Young Scholars of ChinaProject(B110404)supported by the Innovation Program for Excellent Postgraduates of National University of Defense Technology,China
文摘Narrowband radar has been successfully used for high resolution imaging of fast rotating targets by exploiting their micro-motion features.In some practical situations,however,the target image may suffer from aliasing due to the fixed pulse repetition interval(PRI)of traditional radar scheme.In this work,the random PRI signal associated with compressed sensing(CS)theory was introduced for aliasing reduction to obtain high resolution images of fast rotating targets.To circumvent the large-scale dictionary and high computational complexity problem arising from direct application of CS theory,the low resolution image was firstly generated by applying a modified generalized Radon transform on the time-frequency domain,and then the dictionary was scaled down by random undersampling as well as the atoms extraction according to those strong scattering areas of the low resolution image.The scale-down-dictionary CS(SDD-CS)processing scheme was detailed and simulation results show that the SDD-CS scheme for narrowband radar can achieve preferable images with no aliasing as well as acceptable computational cost.