高速低压电力线信道三维电磁建模与抗干扰新技术研究

The power line communication (PLC) technology is one of the best solution scheme for the problem of "the last one hundred meters" problem. This project will research the channel modelling and the suppression method of electromagnetic interferences for the PLC network design. Firstly, the method of three dimension precise modelling of the broad band low voltage power line channel employing full wave electromagnetic simulation technique is proposed. Based on the typical topology structure of powerline in our country, the total PLC channel structure is divided into several typical cells and its network parameters are obtained through the calculation of electromagnetic characteristics, then the whole transmission performances of the PLC channel are achieved through employing the synthesizing the cell networks. Secondly,because the low voltage PLC channel has strong noise and interferences,this project proposes the new anti-jamming methods including time-frequency analysis and cognitive radio technique. Based on the software radio technique, the received digital pulses are analyzed by the time-frequency analysis method in order to suppress the noise and interferences and degrade the bit error rate. For the operation mode of multiple users, the cognitive radio technique is intruduced in PLC. The spectrum sensing and management technique will be researched in order to exploit the channel capacity effectively and reduce the interference among users. The research in this project can provide a new approach to resolve the technical problem in the PLC network design, so it has important theoretical meaning and practical application value.

低压电力线通信(PLC)是解决"最后一百米"问题的最佳方案之一。本项目针对PLC网络设计中的信道建模和电磁干扰抑制问题进行研究。首先提出采用全波电磁仿真技术对电力线信道进行三维精细建模的方法，该方法基于我国典型的电力线拓扑结构，将整体PLC信道结构化分成若干典型单元，通过电磁特性计算提取网络参数，进而采用网络合成方法获取整个信道的传输特性。然后，针对低压电力线信道的强噪声和电磁干扰的问题，提出采用时频分析技术和认知无线电技术的解决新方法；基于软件无线电技术，采用时频分析方法对接收的脉冲信号进行分析，实现噪声和干扰抑制，降低误码率；在多用户工作模式下，将认知无线电技术应用于PLC中，研究PLC中的频谱感知和管理技术，以实现对通信信道的有效利用和降低用户之间的干扰。本项目的研究为解决我国PLC网络设计中的强噪声和电磁干扰抑制的技术难题提供新的解决途径，具有重要的理论意义和实际应用价值。

低压电力线通信(PLC)是解决“最后一百米”问题的重要方法。本项目针对PLC中的信道建模和电磁干扰抑制问题进行研究。首先提出了一种新的基于频域模型的自底向上的传输线信道建模方案，该方案采用N级联单分支网络合成方法获取整个信道的传输特性。然后，在研究电力线传输信道特性和各种典型调制方式特点的基础上，提出了成形正交偏移相位调制(SOQPSK-MIL)解调方案，并通过仿真验证了该调制解调方案的优越性。针对低压电力线信道的强噪声和电磁干扰问题，提出了一种基于时频分析技术的信号检测识别方法，该方法能有效抑制噪声和干扰，并在调制信号的检测识别上获得了理想的效果。针对多用户工作模式下的信道频谱资源紧缺和用户间干扰问题，项目借鉴认知无线电的思路来解决PLC信道频谱感知和管理问题，仿真结果表明，该方法在提高了信道频谱利用率的同时也降低了用户间的干扰。本项目的研究为解决低压PLC信道中的强噪声和电磁干扰问题提供新的解决途径，具有重要的理论意义和实际应用价值。