基于OFDM的電力線通信系統(tǒng)關(guān)鍵技術(shù)研究與實(shí)現(xiàn)
發(fā)布時(shí)間：2019-03-21 11:16
【摘要】：電力線通信的概念由來已久,隨著智能電網(wǎng)概念的不斷發(fā)展和演進(jìn),電力線通信技術(shù)迎來了新的機(jī)遇和挑戰(zhàn)。傳統(tǒng)的窄帶電力線通信技術(shù)提供非常有限的數(shù)據(jù)傳輸能力,已經(jīng)無法滿足現(xiàn)代智能電網(wǎng)的發(fā)展需求,采用具有更高傳輸能力的新一代通信技術(shù)迫在眉睫。為了對(duì)抗電力傳輸線上的強(qiáng)噪聲、強(qiáng)干擾和嚴(yán)重的頻率選擇性衰落,以歐洲的PRIME和G3-PLC為典型代表的新一代窄帶電力線通信系統(tǒng)傾向于采用具有強(qiáng)靈活性和抗多徑衰落能力的正交頻分復(fù)用(OFDM)技術(shù)。目前,以歐盟的G3-PLC標(biāo)準(zhǔn)為重要參考的我國新一代窄帶電力線通信國家標(biāo)準(zhǔn)正在擬定過程中,充分掌握G3-PLC通信的核心技術(shù),非常有助于滿足未來新一代窄帶電力線通信國標(biāo)設(shè)備的快速實(shí)現(xiàn)和部署。本文主要研究了基于OFDM技術(shù)的G3-PLC電力線通信系統(tǒng)的設(shè)計(jì)與實(shí)現(xiàn)。在分析G3-PLC標(biāo)準(zhǔn)的基礎(chǔ)上,完成了通信系統(tǒng)仿真模型的搭建,并在自行設(shè)計(jì)的DSP硬件平臺(tái)上完成了系統(tǒng)的實(shí)現(xiàn)。首先,簡(jiǎn)要回顧了電力線通信發(fā)展的歷史和國內(nèi)外的發(fā)展現(xiàn)狀,對(duì)比了目前影響廣泛的主流電力線通信標(biāo)準(zhǔn),給出了相近標(biāo)準(zhǔn)在重要技術(shù)指標(biāo)上的異同。其次,介紹了基于OFDM的G3-PLC標(biāo)準(zhǔn)。著重描述了G3-PLC標(biāo)準(zhǔn)的物理層規(guī)范和基于OFDM的電力線通信系統(tǒng)的整體結(jié)構(gòu),研究了系統(tǒng)的各種關(guān)鍵技術(shù)。第三,基于G3-PLC標(biāo)準(zhǔn)的物理層規(guī)范,在Simulink平臺(tái)搭建了整個(gè)系統(tǒng)的仿真模型,采用面向硬件實(shí)現(xiàn)的模塊化電路搭建方式,詳細(xì)給出了每個(gè)模塊的結(jié)構(gòu)和參數(shù)設(shè)置情況,并對(duì)系統(tǒng)進(jìn)行了仿真,以驗(yàn)證所設(shè)計(jì)算法的正確性和有效性,為下一步的硬件實(shí)現(xiàn)提供了理論支撐。最后,基于自行設(shè)計(jì)的DSP硬件平臺(tái)實(shí)現(xiàn)了基于OFDM的電力線通信系統(tǒng)。給出了所采用的硬件平臺(tái)和芯片,描述了系統(tǒng)頂層設(shè)計(jì)和涉及的中斷服務(wù)程序。在DSP芯片內(nèi)部開辟了專屬的數(shù)據(jù)存儲(chǔ)區(qū),有效實(shí)現(xiàn)了與MCU的指令和數(shù)據(jù)傳輸,以及對(duì)前端芯片的參數(shù)設(shè)置和狀態(tài)監(jiān)控。由于DSP芯片的內(nèi)存有限,根據(jù)使用情況給出了合理的內(nèi)存分配方式,優(yōu)化了數(shù)據(jù)的存儲(chǔ)和讀取。基于DSP的單線程工作特性,給出了所設(shè)計(jì)的發(fā)送端和接收端信號(hào)/數(shù)據(jù)的處理流程,詳細(xì)說明了系統(tǒng)中每個(gè)模塊的功能和特點(diǎn),著重講述了同步模塊中針對(duì)G3-PLC前導(dǎo)符波形相關(guān)特性提出的相關(guān)峰波形檢測(cè)的算法及其實(shí)現(xiàn)。最后,給出了典型的實(shí)測(cè)場(chǎng)景和測(cè)試性能指標(biāo),驗(yàn)證了所設(shè)計(jì)系統(tǒng)的有效性和可靠性。
[Abstract]:The concept of power line communication has a long history. With the continuous development and evolution of the concept of smart grid, power line communication technology ushered in new opportunities and challenges. The traditional narrow-band power line communication technology provides very limited data transmission capacity, and it is no longer able to meet the development needs of the modern smart grid. It is urgent to adopt a new generation of communication technology with higher transmission capacity. In order to combat strong noise, strong interference and severe frequency selective fading on power transmission lines, The new generation narrowband power line communication systems represented by PRIME and G3-PLC in Europe tend to adopt orthogonal Frequency Division Multiplexing (OFDM) technology with strong flexibility and anti-multipath fading ability. At present, China's new national standard for narrowband power line communication, which is based on the G3-PLC standard of the European Union, is in the process of being drawn up, and the core technology of G3-PLC communication is fully mastered. It is very helpful to meet the rapid implementation and deployment of the new generation narrowband power line communication national standard equipment in the future. This paper mainly studies the design and implementation of G3-PLC power line communication system based on OFDM technology. Based on the analysis of the G3-PLC standard, the simulation model of the communication system is built, and the realization of the system is completed on the DSP hardware platform designed by ourselves. Firstly, this paper briefly reviews the history of the development of power line communication and the current development situation at home and abroad, compares the mainstream power line communication standards which have a wide influence at present, and gives the similarities and differences of the similar standards in the important technical indicators. Secondly, the G3-PLC standard based on OFDM is introduced. The physical layer specification of G3-PLC standard and the whole structure of power line communication system based on OFDM are described emphatically. The key technologies of the system are studied. Thirdly, based on the physical layer specification of G3-PLC standard, the simulation model of the whole system is built on the Simulink platform. The hardware-oriented modular circuit is used to build the model, and the structure and parameter settings of each module are given in detail. Simulation of the system is carried out to verify the correctness and effectiveness of the designed algorithm, which provides theoretical support for the next step of hardware implementation. Finally, based on the self-designed DSP hardware platform, the power line communication system based on OFDM is implemented. The hardware platform and chip are given, and the top-level design and interrupt service program of the system are described. The special data storage area is opened in the DSP chip, the instruction and data transmission with MCU is realized effectively, and the parameter setting and status monitoring of the front-end chip are also realized. Because the memory of DSP chip is limited, the reasonable memory allocation mode is given according to the usage situation, and the storage and reading of data are optimized. Based on the single thread characteristic of DSP, the processing flow of signal / data at the sending and receiving end is given, and the functions and characteristics of each module in the system are described in detail. This paper focuses on the algorithm and implementation of correlation peak waveform detection for G3-PLC preamble waveform correlation characteristics in synchronization module. Finally, the typical measured scene and test performance index are given, and the validity and reliability of the designed system are verified.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TN913.6
本文編號(hào)：2444884
[Abstract]:The concept of power line communication has a long history. With the continuous development and evolution of the concept of smart grid, power line communication technology ushered in new opportunities and challenges. The traditional narrow-band power line communication technology provides very limited data transmission capacity, and it is no longer able to meet the development needs of the modern smart grid. It is urgent to adopt a new generation of communication technology with higher transmission capacity. In order to combat strong noise, strong interference and severe frequency selective fading on power transmission lines, The new generation narrowband power line communication systems represented by PRIME and G3-PLC in Europe tend to adopt orthogonal Frequency Division Multiplexing (OFDM) technology with strong flexibility and anti-multipath fading ability. At present, China's new national standard for narrowband power line communication, which is based on the G3-PLC standard of the European Union, is in the process of being drawn up, and the core technology of G3-PLC communication is fully mastered. It is very helpful to meet the rapid implementation and deployment of the new generation narrowband power line communication national standard equipment in the future. This paper mainly studies the design and implementation of G3-PLC power line communication system based on OFDM technology. Based on the analysis of the G3-PLC standard, the simulation model of the communication system is built, and the realization of the system is completed on the DSP hardware platform designed by ourselves. Firstly, this paper briefly reviews the history of the development of power line communication and the current development situation at home and abroad, compares the mainstream power line communication standards which have a wide influence at present, and gives the similarities and differences of the similar standards in the important technical indicators. Secondly, the G3-PLC standard based on OFDM is introduced. The physical layer specification of G3-PLC standard and the whole structure of power line communication system based on OFDM are described emphatically. The key technologies of the system are studied. Thirdly, based on the physical layer specification of G3-PLC standard, the simulation model of the whole system is built on the Simulink platform. The hardware-oriented modular circuit is used to build the model, and the structure and parameter settings of each module are given in detail. Simulation of the system is carried out to verify the correctness and effectiveness of the designed algorithm, which provides theoretical support for the next step of hardware implementation. Finally, based on the self-designed DSP hardware platform, the power line communication system based on OFDM is implemented. The hardware platform and chip are given, and the top-level design and interrupt service program of the system are described. The special data storage area is opened in the DSP chip, the instruction and data transmission with MCU is realized effectively, and the parameter setting and status monitoring of the front-end chip are also realized. Because the memory of DSP chip is limited, the reasonable memory allocation mode is given according to the usage situation, and the storage and reading of data are optimized. Based on the single thread characteristic of DSP, the processing flow of signal / data at the sending and receiving end is given, and the functions and characteristics of each module in the system are described in detail. This paper focuses on the algorithm and implementation of correlation peak waveform detection for G3-PLC preamble waveform correlation characteristics in synchronization module. Finally, the typical measured scene and test performance index are given, and the validity and reliability of the designed system are verified.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TN913.6
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，本文編號(hào)：2444884
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