基于MFSK的电力线通信系统设计
发布时间：2018-11-06 11:04
【摘要】：科技的进步促进了通信的快速发展,在已处于信息时代的当今社会,信息的传递与通信是其他信息技术的基础。电力线通信是采用无处不在的电力线传送数据的一种通信方式,由于电力线的普遍性,不需要架设新的线路来实现通信而是直接采用现有的电力线进行信息的传送。建立通信网络无需新的支出以及可以方便的实现即插即用的特点受到越来越多的关注。数字通信是信息传递的重要方法和手段。数字频率调制是数字通信中常见的一种调制方式。二进制频移键控(2FSK)方法简单,易于实现,并且解调不需要恢复本地载波,可以异步传输,抗噪声和抗衰落性能也较强。因此,2FSK调制技术在通信行业中得到了广泛的应用,并且主要适用于低、中速数据传输。MFSK是2FSK的推广,在相同的码元传输速率下,MFSK的信息传输速率比2FSK的信息传输速率高,提高了系统的有效性。本文首先阐述了电力线通信的概念,介绍了电力线通信当国内国外的发展,对FPGA技术、数字调制技术和滤波器原理进行了简单介绍,并对本论文涉及的相关技术原理进行了必要的理论研究分析,为系统设计准备好相关理论依据。在此基础上论述了电力线通信系统的详细方案设计,包括发射机和接收机各个模块实现原理,然后用MATLAB对发射机和接收机进行了浮点和定点仿真验证,确定了定点系数。最后搭建了FPGA硬件实现平台,实现了系统在开发板上的运行,并进行了实际硬件环境下的测试调试。本论文的关键是调制和解调算法方案设计。当告警信号产生时,告警信号加上设备地址信息进行组帧,一帧二进制信号经过RS编码,8FSK调制,DA变换后耦合到直流电力线上进行传输。接收端接收到信号经过AD变换,数字下变频,IIR低通滤波后,送入8路解调器。每路解调器的信号分别乘以正余弦载波,并通过IIR低通滤波器后,平方求和开方。然后8路解调器解调出的信号送入抽样判决器从而得到信号帧。最后通过RS解码得到告警信号。本论文设计的基于MFSK调制解调系统,实现了系统的设计目标。本系统还可以应用于智能家居和智能医疗领域,可以利用电力线实现家电的控制和居民健康的实时监护。
[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.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN913.6
[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.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN913.6
【共引文献】
相关期刊论文 前4条
1 刘恒;李帆;毕伟;;低压电力线载波通信现场测试与分析[J];湖北电力;2015年02期
2 黄辰臣;宁永海;吴贞贞;;动力线载波传感控制网络的权值分簇组网[J];计算机工程与应用;2015年10期
3 陈候海;陈忠辉;;纠错编码在低压电力线载波通信中的应用[J];数字技术与应用;2011年08期
4 邓桂平;魏胜清;郭s，
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