本文選題：PLC + 前向糾錯��； 參考：《南京航空航天大學(xué)》2014年碩士論文

【摘要】：電力線多載波通信(PLC)利用已有配電網(wǎng)進(jìn)行數(shù)據(jù)傳輸,具有施工成本低,建設(shè)周期短等優(yōu)點。近年來正交頻分復(fù)用(OFDM)技術(shù)在PLC中的應(yīng)用已成為研究熱點,并被多種PLC國際標(biāo)準(zhǔn)組織所采納。融合了前向糾錯碼技術(shù)、OFDM技術(shù)和模擬前端的G3-PLC標(biāo)準(zhǔn)是專為智能電網(wǎng)通信設(shè)計的PLC開放標(biāo)準(zhǔn)。本文在OFDM算法研究、前向糾錯碼和模擬前端技術(shù)實現(xiàn)的基礎(chǔ)上,設(shè)計了一種基于G3-PLC標(biāo)準(zhǔn)的電力線多載波通信原型系統(tǒng)。本文的主要工作如下:1.研究了OFDM算法。OFDM作為G3-PLC標(biāo)準(zhǔn)核心技術(shù),能夠很好地解決電力線信道中多徑時延和頻率選擇性衰弱的問題。根據(jù)OFDM和循環(huán)前綴的解析式,描述了各自的作用和特點。對OFDM在PLC中的優(yōu)缺點進(jìn)行了歸納。搭建了PLC原型系統(tǒng)總體架構(gòu)。2.完成了PLC原型系統(tǒng)物理層的FPGA代碼設(shè)計,給出了前向糾錯碼和OFDM調(diào)制的具體代碼實現(xiàn)方案。對發(fā)送和接收中編碼/解碼,調(diào)制/解調(diào)對應(yīng)模塊進(jìn)行仿真、調(diào)試,記錄數(shù)據(jù)。將記錄的數(shù)據(jù)值對比,驗證了FPGA代碼正確完成了數(shù)據(jù)的編碼和調(diào)制功能。對基于本地序列的定時同步算法與基于循環(huán)訓(xùn)練序列的信道估計算法提出了改進(jìn)方案,并對方案實現(xiàn)進(jìn)行了仿真、驗證。3.完成了PLC原型系統(tǒng)模擬前端設(shè)計。采用DAC121S101完成DA轉(zhuǎn)換,OPA564增強(qiáng)發(fā)射信號驅(qū)動能力,PGA112對接收到的電力線衰弱信號進(jìn)行程控放大處理。完成各模塊原理圖與PCB設(shè)計、硬件電路焊接與調(diào)試。4.完成PLC原型系統(tǒng)測試。用MATLAB對OFDM調(diào)制發(fā)射模塊進(jìn)行定點化仿真,與ChipScope邏輯分析波形對比,驗證了FPGA代碼輸出正確性。FPGA接收端使用二次相關(guān)峰值對同步模塊進(jìn)行檢測。對模擬前端各單元進(jìn)行仿真,讀取每個單元輸入輸出值的變化,驗證了模擬前端設(shè)計達(dá)到功能驗證設(shè)計要求。給出UART和SPI接口實現(xiàn)方案,實現(xiàn)PLC原型系統(tǒng)與外部設(shè)備的正常通信。本文完成了基于G3標(biāo)準(zhǔn)的PLC原型系統(tǒng)設(shè)計和調(diào)試,為下一步集成電路的設(shè)計做好了技術(shù)準(zhǔn)備工作。
[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.
【學(xué)位授予單位】：南京航空航天大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TN913.6

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相關(guān)期刊論文 前1條

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本文編號：1865029