【摘要】：科技的進(jìn)步促進(jìn)了通信的快速發(fā)展,在已處于信息時代的當(dāng)今社會,信息的傳遞與通信是其他信息技術(shù)的基礎(chǔ)。電力線通信是采用無處不在的電力線傳送數(shù)據(jù)的一種通信方式,由于電力線的普遍性,不需要架設(shè)新的線路來實(shí)現(xiàn)通信而是直接采用現(xiàn)有的電力線進(jìn)行信息的傳送。建立通信網(wǎng)絡(luò)無需新的支出以及可以方便的實(shí)現(xiàn)即插即用的特點(diǎn)受到越來越多的關(guān)注。數(shù)字通信是信息傳遞的重要方法和手段。數(shù)字頻率調(diào)制是數(shù)字通信中常見的一種調(diào)制方式。二進(jìn)制頻移鍵控(2FSK)方法簡單,易于實(shí)現(xiàn),并且解調(diào)不需要恢復(fù)本地載波,可以異步傳輸,抗噪聲和抗衰落性能也較強(qiáng)。因此,2FSK調(diào)制技術(shù)在通信行業(yè)中得到了廣泛的應(yīng)用,并且主要適用于低、中速數(shù)據(jù)傳輸。MFSK是2FSK的推廣,在相同的碼元傳輸速率下,MFSK的信息傳輸速率比2FSK的信息傳輸速率高,提高了系統(tǒng)的有效性。本文首先闡述了電力線通信的概念,介紹了電力線通信當(dāng)國內(nèi)國外的發(fā)展,對FPGA技術(shù)、數(shù)字調(diào)制技術(shù)和濾波器原理進(jìn)行了簡單介紹,并對本論文涉及的相關(guān)技術(shù)原理進(jìn)行了必要的理論研究分析,為系統(tǒng)設(shè)計準(zhǔn)備好相關(guān)理論依據(jù)。在此基礎(chǔ)上論述了電力線通信系統(tǒng)的詳細(xì)方案設(shè)計,包括發(fā)射機(jī)和接收機(jī)各個模塊實(shí)現(xiàn)原理,然后用MATLAB對發(fā)射機(jī)和接收機(jī)進(jìn)行了浮點(diǎn)和定點(diǎn)仿真驗(yàn)證,確定了定點(diǎn)系數(shù)。最后搭建了FPGA硬件實(shí)現(xiàn)平臺,實(shí)現(xiàn)了系統(tǒng)在開發(fā)板上的運(yùn)行,并進(jìn)行了實(shí)際硬件環(huán)境下的測試調(diào)試。本論文的關(guān)鍵是調(diào)制和解調(diào)算法方案設(shè)計。當(dāng)告警信號產(chǎn)生時,告警信號加上設(shè)備地址信息進(jìn)行組幀,一幀二進(jìn)制信號經(jīng)過RS編碼,8FSK調(diào)制,DA變換后耦合到直流電力線上進(jìn)行傳輸。接收端接收到信號經(jīng)過AD變換,數(shù)字下變頻,IIR低通濾波后,送入8路解調(diào)器。每路解調(diào)器的信號分別乘以正余弦載波,并通過IIR低通濾波器后,平方求和開方。然后8路解調(diào)器解調(diào)出的信號送入抽樣判決器從而得到信號幀。最后通過RS解碼得到告警信號。本論文設(shè)計的基于MFSK調(diào)制解調(diào)系統(tǒng),實(shí)現(xiàn)了系統(tǒng)的設(shè)計目標(biāo)。本系統(tǒng)還可以應(yīng)用于智能家居和智能醫(yī)療領(lǐng)域,可以利用電力線實(shí)現(xiàn)家電的控制和居民健康的實(shí)時監(jiān)護(hù)。
[Abstract]:The progress of science and technology has promoted the rapid development of communication. In the information age, the transmission and communication of information is the basis of other information technologies. Power line communication is a kind of communication mode which uses ubiquitous power line to transmit data. Because of the universality of power line, it is not necessary to set up new lines to realize communication, but to transmit information directly by existing power line. More and more attention has been paid to the characteristics of the establishment of communication network without new expenses and the convenience of implementing plug and play (P & amp; lt;). Digital communication is an important method and means of information transmission. Digital frequency modulation is a common modulation method in digital communication. The binary frequency shift keying (2FSK) method is simple and easy to implement, and the demodulation does not need to recover the local carrier, so it can be transmitted asynchronously, and has strong anti-noise and anti-fading performance. Therefore, 2FSK modulation technology has been widely used in the communication industry, and it is mainly suitable for low and medium speed data transmission. MFSK is the extension of 2FSK. Under the same symbol transmission rate, the information transmission rate of MFSK is higher than that of 2FSK. The effectiveness of the system is improved. This paper first introduces the concept of power line communication, introduces the development of power line communication at home and abroad, and briefly introduces FPGA technology, digital modulation technology and filter principle. The related technical principles of this paper are studied and analyzed in order to prepare the theoretical basis for the system design. On this basis, the detailed scheme design of power line communication system is discussed, including the realization principle of each module of transmitter and receiver, and then the floating-point and fixed-point simulation of transmitter and receiver is carried out with MATLAB, and the fixed-point coefficient is determined. Finally, the FPGA hardware implementation platform is built, which realizes the system running on the development board, and carries on the testing and debugging under the actual hardware environment. The key of this thesis is the scheme design of modulation and demodulation algorithm. When the alarm signal is generated, the alarm signal is combined with the device address information to frame the frame. A frame binary signal is encoded by RS, modulated by 8FSK and coupled to the DC power line for transmission after DA transformation. The receiver receives the signal through AD transform, digital downconversion, IIR low pass filter, and then sends into 8 demodulator. The signal of each demodulator is multiplied by the sinusoidal carrier and the square sum is obtained after passing through the IIR lowpass filter. The signal demodulated by the 8-channel demodulator is then fed into the sampling decider to obtain the signal frame. Finally, the alarm signal is obtained by RS decoding. Based on the MFSK modulation and demodulation system, the design goal of the system is realized. The system can also be used in the field of smart home and intelligent medical treatment. It can use power line to realize the control of household appliances and real-time monitoring of residents' health.
【學(xué)位授予單位】：西安電子科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TN913.6

【共引文獻(xiàn)】

相關(guān)期刊論文 前4條

1 劉恒;李帆;畢偉;;低壓電力線載波通信現(xiàn)場測試與分析[J];湖北電力;2015年02期

2 黃辰臣;寧永海;吳貞貞;;動力線載波傳感控制網(wǎng)絡(luò)的權(quán)值分簇組網(wǎng)[J];計算機(jī)工程與應(yīng)用;2015年10期

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4 鄧桂平;魏勝清;郭s，

本文編號：2314088