【作者】 余毅；

【导师】 张朝阳；

【作者基本信息】 浙江大学 ， 信息与信号处理， 2004， 硕士

【摘要】 在过去应用广泛的电力线被认为有很大的潜力用于数据通信。事实上，在最近的几十年，电力线已经被用于低速数据通信，在Lon Works，CEBus，and X-10等电力线标准中都有提及和应用，特别是在一些特定系统中用于传输控制和管理信号。然而，电力线由于其自身的噪声严重和不可预测的特点，而很少作为高速数据通信信道。但是，近年来通信和调制技术的发展，特别是自适应数字信号处理和错误检测及纠正技术，使电力线通信技术出现新的MAC层和物理层协议，其性能可以和一些专用有线网络以及最近十年流行的无线局域网技术想媲美。 在2001年，一个由13个公司(包括Cisco，Motorola,Intel，Panasonic，and Texas Instruments)组成的组成的标准组织——HomePlug Powerline联盟，颁布了完整的HomePlug1.0规范，改规范使基于正交频分复用技术，主要针对10Mb／s室内电力线网络技术。显然，电力线载波通信技术现在已经被看作使3种主要的室内网络解决方案之一，与以太网，无线局域网(IEEE 802.11x)相互补充。本文主要的研究对象使基于OFDM的电力线载波通信传输系统的物理层，对电力线载波信道进行了着重的分析，给出响应的估计算法以及硬件实现模块。 第一章介绍了宽带接入网络的发展，着重介绍了基于正交频分复用(OFDM)的室内电力线载波通信网络技术，给出HomePlug1.0协议规范，重点在于物理层和MAC层技术规范。 第二章分析了电力线载波通信信道特性，重点在于针对相应的信道特性对信道进行建模并，给出电力线信道下的信道估计方法和仿真结果。 第三章对困扰OFDM传输系统的非线性失真现象进行了讨论，分析了3种主要的降低非线性失真的方法，对其性能和复杂度进行比较，证明了使用编码方法用于降低系统PAPR值最有效。 第四章在前几章的理论基础上，提出了适合于HomePlug1.0的电力线载波通信接收机的系统方案，同时介绍了基于MPC860T的OFDM基带传输系统平台的嵌入式实现，对整个平台的硬件和软件构成都有较为详细的介绍。更多还原

【Abstract】 The use of ubiquitous electrical wiring as a potential medium for communication signals has been suggested over past generations. Indeed, for some decades now, power line wires have been ?used for low-speed data communication, culminating in such standards and products as LonWorks, CEBus, and X-10, as well as many proprietary systems for the transmission of control and management signals. However, the power line has largely been dismissed as being too noisy and unpredictable to be useful as a practical high-speed communication channel. On the other hand, recent advances in communication and modulation methodologice, as well as in adaptive digital signal processing and error detection and correction, have opened the way for the development of effective medium access control and physical layer protocols that support power line communications(PLC) networks operating at speeds comparable to those obtained from specially wired and more recent wireless local area network In mid-2001,an industrial standards organization called the HomePlug Powerline Alliance, originally founded by 13 companies including Cisco, Motorola, Intel, Panasonic, and Texas Instruments, announced the completion of the HomePlugl.O specification for a l.0Mb/s class in-home power line networking technology based on orthogonal frequency-division multiplexing(OFDM). Products based on this industry standard are enjoying much positive attention in the market press from industry and produce analysts based on performance and case of use. It was clear that HomePlug is now recognized as one of three attractive in-home net working solutions, together with Ethernet and Wi-Fi(IEEE 802.11lx). This thesis presents the studies of the physical layer of power line communications, which is an OFDM-based transmission system. It gives feasible algorithms, and primary implementation of some key modules is discussed as well.Chapter 1 gives a brief survey of the development of Broadband Access networks, after the introduction the main technology of Access networks, we give out the new in-home power line networking technology based on orthogonal frequency-division multiplexing(OFDM), and studies the general content of HomePlugl.O protocol, focusing on the Physical Layer and Mac Layer Specifications of the protocol.Chapter II analyze the channel character of the power line communication channel, constructs a system model taking consideration of power line channels and the channel estimation algorithm based on pilots are investigated.Chapter III, analyze some algorithm to increase the robustness to system nonlinearities in OFDM, compares the advantage and disadvantage of the popular three techniques of PAPR decrease, and proved coded technique is the most effective method for OFDM system.Chapter IV advances a proposed systematic scheme of power line receivers in accordance with HomePlugl.O on the basis of analysis in Chapter III, present the implementation of an OFDM baseband transmission platform based on MPC860T embedded system.更多还原