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IC693CHS391J

PLC(PowerLineCommunication)即电力线通信是指利用电力线传输数据和话音信号的一种通信方式。迄今，PLC技术已经有几十年的发展历史，在技术发展的各个阶段，电力系统已经得到了不同的应用。在高压输电网（35kV以上）、中压输电网（10kV-35kV）以及低压(10kV以下)的各个领域，数据传输的通讯数率不断提高。现阶段，在低压配电网上传输数率已由1Mbps发展到2Mbps、14Mbps、24Mbps、45Mbps甚至达到100Mbps和200Mbps的高速率，传输距离可达300米。在中压配电网传输技术方面，高于10Mbps数据信号的设想和方案也日益引起人们的重视并开发成功。

PLC的工作原理：电力线是一个极其不稳定的高躁声、强衰减的传输通道，要实现可靠的电力线高速数据通信，必须解决低压配电网上各种因素如：噪声、阻抗波动、配电网结构、电磁兼容性以及线路阻抗和容性负载引起的信号衰减等主要因素对数据传输的影响。

为了解决以上低压配电网中各因素对数据传输的影响，在国际范围内，低压配电网的高速数据通信普遍选择了正交频分复用技术OFDM（OrthogonalFrequencyDivisionMultiplexing）作为核心调制技术。OFDM技术采用多路窄带正交子载波，同时传输多路数据，每路信号的码元时间较长，可以避免码元间干扰。通过动态选择可用的子载波，该技术可以减少窄带干扰和频率的谷点的影响。OFDM技术起源于二十世纪六十年代，主要用于军用高频通信系统。70年代，随着离散傅立叶变换来实现多载波调制技术的提出，以及近年来数字信号处理(DSP)技术的飞速发展，OFDM作为一种可以有效对抗信号波形间干扰的高速传输技术被广泛应用于民用通信系统中。目前在无线局域网已经采用了该技术，第四代移动通信（4G）中将采用OFDM技术。

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IC693CHS391J

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