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| 摘要: |
| 电力线通信PLC(Power Line Communication)是以电力线作为通信载体，加上PLC的局端和终端调制解调器，将电力网作为电力通信网络。PLC是以太网的一个分支，采用了基于CSMA／CA的广播共享方式的接入网络原理。由于PLC信道具有时变性、大衰减性及存在复杂多样的干扰噪声．PLC高速载波通信采用正交频分多路复用OFDM(Orthogonal Frequency Division Muhiplexing)技术．可提高网络传输质量。探讨了PLC电磁辐射机理、家电电磁辐射及PLC电磁辐射标准、电磁辐射的影响和防护措施(改善或利用PLC系统电力线的对称性、减小PLC信号的功率谱密度、合理选择OFDM的参数等)。理论和实践表明，PLC的干扰是轻微和可以控制的。 |
| 关键词: 电力线通信 电磁辐射 电磁兼容 标准 无线电干扰 宽带接入 |
| DOI： |
| 分类号:TN915.853 |
| 基金项目: |
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| Research on PLC broadband access technology and its electromagnetic radiation |
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CHEN Tian-hua
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| Abstract: |
| With the power line as its carrier and the modems installed at locals and terminals,PLC(Power Line Communication) enhances the power network to a power communication network. As a branch of Ethernet,PLC accesses it in broadcast way based on CSMA / CA. Since time,varying,large decaying and complex interferences occur in PLC channel,applying OFDM(Orthogonal Frequency Division Multiplexing) technology in PLC high,speed carrier communication can improve its trans,mission quality. The mechanism of PLC electromagnetic radiation and its influence are discussed,as well as the electromagnetic radiation standards,the electromagnetic radiation and its influence of home electric appliances. Some countermeasures are put forward:improve and make use of the symmetry of power line;lower the power spectrum density;select the OFDM parameters reasonably. The theoretical analysis and experiment results show that the interference of PLC is slight and controllable. |
| Key words: PLC,electromagnetic radiation,electromagnetic compatibility,standard,radio interfe, rence,broadband access, |
