OFDM在配电网高速数据通信中的应用

Application of OFDM in distribution network high-speed data communication

低压配电网高速数据通信技术能够实现电力、数据、语音、视频“四网合一”,具有广阔的应用前景。由于传统的电力线载波通信技术难以适应配电网复杂而恶劣的环境,因此,新的通信标准、先进的调制技术和大规模集成电路的研究与应用,日益受到业界的关注。文章从测试和分析配电网高频传输特性入手,论述了正交频分复用技术的理论基础,阐述了基于配电网环境的功率控制、自适应调制、通道均衡、抗符号间干扰等关键技术,并介绍了一个实用化的配电网通信系统。

With the technology development of high-speed data distribution line communication (DLC), the electric power, data, voice and video can be transferred in the same electric power distribution network, and it will be put in operation widely in the future. Because of the traditional technology of power line communication (PLC) is not adaptable to the complex and harsh environment of distribution line channel, the research on new communication standards, advanced modulation technologies and large-scale integrated circuits is greatly catching our attention now. The characteristics of distribution line channel are analyzed in this paper, and the principle of Orthogonal Frequency Division Multiplexing (OFDM) is explained, the key technologies, such as automatic gain control, self-adaptation modulation, channel balance and resistance to inter-symbol interference are presented, and a practical communication system is introduced.