电力线多载波通信原型系统设计

发布时间：2018-05-09 06:56

本文选题：PLC + 前向纠错　；参考：《南京航空航天大学》2014年硕士论文

【摘要】：电力线多载波通信(PLC)利用已有配电网进行数据传输,具有施工成本低,建设周期短等优点。近年来正交频分复用(OFDM)技术在PLC中的应用已成为研究热点,并被多种PLC国际标准组织所采纳。融合了前向纠错码技术、OFDM技术和模拟前端的G3-PLC标准是专为智能电网通信设计的PLC开放标准。本文在OFDM算法研究、前向纠错码和模拟前端技术实现的基础上,设计了一种基于G3-PLC标准的电力线多载波通信原型系统。本文的主要工作如下:1.研究了OFDM算法。OFDM作为G3-PLC标准核心技术,能够很好地解决电力线信道中多径时延和频率选择性衰弱的问题。根据OFDM和循环前缀的解析式,描述了各自的作用和特点。对OFDM在PLC中的优缺点进行了归纳。搭建了PLC原型系统总体架构。2.完成了PLC原型系统物理层的FPGA代码设计,给出了前向纠错码和OFDM调制的具体代码实现方案。对发送和接收中编码/解码,调制/解调对应模块进行仿真、调试,记录数据。将记录的数据值对比,验证了FPGA代码正确完成了数据的编码和调制功能。对基于本地序列的定时同步算法与基于循环训练序列的信道估计算法提出了改进方案,并对方案实现进行了仿真、验证。3.完成了PLC原型系统模拟前端设计。采用DAC121S101完成DA转换,OPA564增强发射信号驱动能力,PGA112对接收到的电力线衰弱信号进行程控放大处理。完成各模块原理图与PCB设计、硬件电路焊接与调试。4.完成PLC原型系统测试。用MATLAB对OFDM调制发射模块进行定点化仿真,与ChipScope逻辑分析波形对比,验证了FPGA代码输出正确性。FPGA接收端使用二次相关峰值对同步模块进行检测。对模拟前端各单元进行仿真,读取每个单元输入输出值的变化,验证了模拟前端设计达到功能验证设计要求。给出UART和SPI接口实现方案,实现PLC原型系统与外部设备的正常通信。本文完成了基于G3标准的PLC原型系统设计和调试,为下一步集成电路的设计做好了技术准备工作。
[Abstract]:Power line multicarrier communication (PLC) has the advantages of low construction cost and short construction period. In recent years, the application of orthogonal Frequency Division Multiplexing (OFDM) technology in PLC has become a research hotspot and adopted by many international standard organizations of PLC. Combining forward error correction code technology and analog front-end G3-PLC is an open PLC standard designed for smart grid communication. Based on the research of OFDM algorithm, forward error correction code and analogue front-end technology, a power line multi-carrier communication prototype system based on G3-PLC standard is designed in this paper. The main work of this paper is as follows: 1. As the core technology of G3-PLC, OFDM algorithm is studied, which can solve the problems of multipath delay and frequency selective fading in power line channel. According to the analytical expressions of OFDM and cyclic prefix, their functions and characteristics are described. The advantages and disadvantages of OFDM in PLC are summarized. PLC prototype system architecture. 2. 2. The FPGA code design of the physical layer of the PLC prototype system is completed, and the implementation scheme of the forward error correction code and the OFDM modulation code is given. Code / decode, modulation / demodulation module in the transmission and reception simulation, debugging, recording data. By comparing the recorded data values, it is verified that the FPGA code completes the encoding and modulation functions of the data correctly. An improved scheme of timing synchronization algorithm based on local sequence and channel estimation algorithm based on cyclic training sequence is proposed. The simulation front end design of PLC prototype system is completed. Using DAC121S101 to realize DA conversion OPA564 to enhance the driving ability of transmitting signal PGA112 is used to amplify the received power line debilitating signal by program control. Complete each module schematic diagram and PCB design, hardware circuit welding and debugging. 4. Complete PLC prototype system test. The MATLAB is used to simulate the OFDM modulation and transmit module, and compared with the ChipScope logic analysis waveform, the correctness of the FPGA code output is verified. The second correlation peak value is used to detect the synchronization module at the receiving end of FPGA. The analog front-end units are simulated and the changes of the input and output values of each unit are read to verify that the analog front-end design meets the functional verification design requirements. The implementation scheme of UART and SPI interface is given to realize the normal communication between PLC prototype system and external equipment. In this paper, the PLC prototype system based on G3 standard is designed and debugged.
【学位授予单位】：南京航空航天大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN913.6

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