电力线通信的电磁辐射及对策

分析了电力线通信 PLC(Power Line Communication)电磁辐射机理,重点探讨电力线通信的电磁兼容问题,包括 PLC 系统与无线电设备的电磁兼容性,以及不同 PLC 系统之间的电磁兼容性,并给出减小 PLC 电磁辐射的对策。     

宽带电力线通信电磁辐射干扰及无线电管理浅析

首先介绍有关电力线通信技术的概念和定义,之后分析了宽带电力线通信系统电磁辐射干扰的来源．并总结分析了国际上有关国家对宽带电力线通信的管理政策。     

电力线通信标准化研究

介绍了主要电力线通信标准组织的标准制定情况,重点给出了ITU-T G.hn、HomePlug AV/GreenPHY/AV2、IEEE 1901、HD-PLC等宽带电力线标准和IEEE 1901.2、ITU-T G.hnem、G3-PLC、PRIME等窄带电力线标准,并介绍了我国电力线标准现状和在研的标准项目.     

宽带电力线通信调制解调器

简述宽带电力线通信调制解调器的特性与应用.     

电力线通信室内互联技术电磁发射测试与分析

对高速宽带电力线通信（BPL）在室内互联场景下的应用进行了分析和测试,特别详细描述BPL产品的电磁发射测量。最后根据测试结果给出了BPL室内互联的应用建议,并对BPL产品的电磁兼容标准进行了初步探讨。     

国外高速电力线通信技术发展分析

电力线无处不在，利用它来进行信息的传输一直是人们的梦想。通过多年的研究和发展，利用高压电力线来传输低速数据的技术已相当成熟。随着网络技术及多媒体技术的发展、利用电力线来实现高速Internet接入及多媒体信息传输是当前的研究热点，国外在相关研究和应用方面巳取得了很大进展。本将详细分析国外在高速电力线通信(PLC)基础研究、产品研发、市场应用、标准与管制方面的现状及存在的问题。     

宽带电力线通信的电磁兼容探讨

宽带电力线通信(BPLC)利用现有的电力网作为高速数据传输媒介时,存在屏蔽性差、阻抗不匹配、载波频率与短波无线电频段重叠等问题,由此而引发的电磁干扰成为BPLC普及与推广的最大障碍,同时也给BPLC商业化提出了更高的电磁兼容要求.本文探讨了宽带电力线通信中可能存在的电磁干扰问题以及电磁辐射的测量方法,并提出了改善BPLC系统电磁兼容性的措施.     

中压电力线通信技术

本文总结了近年来国内外中压电力线通信相关领域的研究成果,对中压电力线信道的信道特性进行了分析,并介绍了中压电力线通信所涉及的物理层、MAC层关键技术以及相关通信系统的发展情况.     

利用高速电力线通信技术快速构建局域网

高速电力线通信技术可以在电力线上传递高达100Mbps以上的数据信号。本文对高速电力线通信中的关键技术和相关产品进行了介绍,并说明如何利用这些设备构建家庭或办公局域网,以及组网过程中经常会遇到的问题和相应的解决办法。     

室内电力线信道特性分析

利用低压电力线高速、可靠地传输通信数据可以节省专用通信线路,但是低压电力线路特别是室内电力线路网络结构和负载特性复杂,需要对信道有深入的了解。文章简要介绍了电力线通信的原理,并分析了电力线信道的时变性、噪声特性、阻抗特性及衰减特性,为电力线通信系统的设计提供了参考。     

Wavelet-based OFDM-CDMA high speed power line communication systems

This letter derives the Equivalent M-band Discrete Wavelet(EMDW) transmission mode of Orthogonal Frequency Division Multiplexing(OFDM) transmission systems, and presents a new Quadrature M-band Discrete Wavelet(QMDW) based OFDM-CDMA(Code Division Multiple Access) communication systems for high speed Power Line Communication (PLC) channels,This system gives much better robustness to Inter-Channel Interference (ICI), Multi-User Interference (MUI) and noise interference, which is verified by simulation.     

Coexistence of broadband power line communication systems

es and the radiation field are finally determined.     

White broadband power line communication: Exploiting the TVWS for indoor multimedia smart grid applications

Balancing the energy production and consumption in smart grids influences the integration of new high‐speed communication technologies, to support monitoring services. Sharing the television white space (TVWS) spectrum between licensed and unlicensed users has been recommended by the federal communications commission in 2004. Federal communications commission allows the unlicensed users to access both the very high frequency (VHF) and the ultra‐high frequency channels in TVWS. On the other hand, broadband power line communication (BPLC) has drawn the researchers' attention over the last decade as a high‐speed indoor communication technology. One application for BPLC is the multimedia service in smart grid applications. In this article, we present an overview of the standards, regulations, and channel models of the TVWS and BPLC as 2 separate technologies. We then propose the deployment of the BPLC technology in the TVWS VHF band to build up the white BPLC (WBPLC) communication systems. The WBPLC incorporates the TVWS and the BPLC technologies into multiple‐input multiple‐output communication systems in the VHF band. The simulation results show significant throughput enhancement in the WBPLC over both the TVWS and BPLC communication systems, indicating that WBPLC can be a promising technology to serve the growing needs for the multimedia services in future smart grids.     

一种低压电力线宽带载波通信单元快速检测系统

针对电力企业缺少低压电力线宽带载波通信单元快速检测装置的现状,本文介绍了一种低压电力线宽带载波通信单元快速检测系统设计方案.系统采用模块化设计,包括上位机检测单元、虚拟集中器、虚拟电能表、射频衰减、载波侦听、程控衰减等模块组成.通过上位机检测系统设置检测任务并下发给虚拟集中器、虚拟电能表、载波侦听模块等设备,该系统能够...     

Interference characteristics of broadband power line communication systems using aerial medium voltage wires

The promise of broadband power line (BPL) communications - broadband access to virtually every home in the United States - remains unfulfilled if the radio emissions from these systems cause significant harmful interference to other users of the wireless spectrum. This article presents an elementary analysis of the physical mechanisms underlying these emissions, from which the interference characteristics of BPL systems can be derived. Numerical models are evaluated for idealized systems using overhead medium-voltage wires, a configuration that is of particular interest for U.S. deployments. The central conclusions of the analysis are: (i) BPL interference is governed primarily by two parameters: signal power and electrical balance of system excitation; (ii) interfering emissions are typically confined to the immediate vicinity of the BPL wire, but long-range effects cannot be neglected; and (iii) measurements on an installed BPL system suggest that it is operating within, but very close to, the limits set by rules recently adopted by the Federal Communications Commission.     

Design considerations for broadband indoor infrared wireless communication systems

Recently there has been a growing interest in using infrared light for broadband indoor wireless communications. There are two major limitations for establishing a wideband infrared communications link. The first and most important limit is the power requirements of such a link. The second important impairment is the intersymbol interference caused by multipath dispersion. In this paper we address the issue of designing an optimized transmission system to provide the best power efficiency for an infrared link. Important parameters that should be considered for this design and some examples of efficient link designs are discussed. The suggested designs can improve the power efficiency of an indoor infrared link up to 4 to 8 dBo while providing a smaller rms delay spread, more robustness to shadowing and a more uniform distribution of power. Characteristics of the indoor infrared channel depends upon the directions of the receiver. This dependency can be used in designing a direction diversity receiver to decrease the rms delay spread of the received signal and to reduce the effects of noise by using proper combining techniques. We discuss the effects of receiver direction and field-of-view on the channel parameters and suggest a configuration for a direction diversity receiver.     

分析高数据速率时的抖动

随着数据速率超过Gbps水平,工程师必须能够识别和解决抖动问题。抖动是在高速数据传输线中导致误码的定时噪声。如果系统的数据速率提高,在几秒内测得的抖动幅度会大体不变,但在位周期的几分之一时间内测量时,它会随着数据速率成比例提高,进而导致误     

A fast bit-loading algorithm for high speed power line communications

Adaptive bit-loading is a key technology in high speed power line communications with the Orthogonal Frequency Division Multiplexing (OFDM) modulation technology. According to the real situation of the transmitting power spectrum limited in high speed power line communications, this paper explored the adaptive bit loading algorithm to maximize transmission bit number when transmitting power spectral density and bit error rate are not exceed upper limit. With the characteristics of the power line channel, first of all, it obtains the optimal bit loading algorithm, and then provides the improved algorithm to reduce the computational complexity. Based on the analysis and simulation, it offers a non-iterative bit allocation algorithm, and finally the simulation shows that this new algorithm can greatly reduce the computational complexity, and the actual bit allocation results close to optimal.     

一种高效低时延的宽带电力线通信网多跳MAC协议

针对IEEE1901.1宽带电力线通信媒体接入控制(Medium Access Control,MAC)协议涉及到信标时隙利用不充分和控制开销过大等问题,提出了一种高效低时延的宽带电力线通信网多跳MAC协议(Efficient and Low Delay Multi-hop MAC,ELDM-MAC).采用基于节点层级...     

电力光载无线宽带接入技术研究

光载无线技术结合光纤通信和无线移动通信的技术优势,可以较好地解决带宽、灵活性和电磁干扰问题.随着我国智能电网建设的展开,对通信带宽、稳定性和接入可靠性的要求越来越高.研究基于电力EPON的光载无线宽带接入技术,重点是系统上下行传输协议.用现有的电力EPON网络汇聚无线节点,结合光和无线两者的优势,为终端用户提供空中接口服务,可以在满足电力通信需求的同时减少成本.通过现场实际应用测试证明了该技术的性能和可行性.