环境反向散射系统的模型搭建和误码率分析
发布时间：2019-01-23 17:32
【摘要】：随着信息化时代的到来,科技的发展与互联网的普及,物联网(Internet Of Things,IOT)作为信息技术的重要组成部分逐渐成为社会关注的焦点。物联网,顾名思义,就是通过互联网将物与物相连。作为物联网的关键技术,射频识别(Radio Frequency Identification,RFID)技术也日益受到社会的青睐。射频识别通过无线电识别特定目标并读写相关数据,而无需识别系统与特定目标之间建立机械或光学接触。但是由于射频识别技术中,无源设备之间无法进行通信,也就无法实现真正的物联网。同时射频识别技术中存在通信距离短、路径损耗严重以及设备依赖电源等缺点,这些缺点一直制约着射频识别技术的发展。幸运的是,近年来基于射频识别技术衍生的环境反向散射技术在系统研制和技术实现方面取得了里程碑式的突破。环境反向散射技术是利用周围环境中的信号(如电视广播信号、手机信号、WiFi等)来创建新型的网络通信方式。其通过反向散射环境中普遍存在的无线电信号,达到能量采集和信号传输的目的。一方面可以使通信设备摆脱对电源的依赖,另一方面也有效地延长了通信的距离。环境反向散射技术还可以支持节点之间的点对点通信,充分扩展了射频识别技术应用的空间范围和部署规模。环境反向散射技术也凭借其新颖性和无源性,吸引了众多学者的关注和研究。本文基于环境反向散射技术,构建了两种新型的无线通信系统模型,分别是多天线系统模型和多标签系统模型,并分别描述了两种系统模型的通信过程,制定了对应的通信协议。通过对两种通信系统模型进行符号化数学建模,本文对系统模型进行了理论分析,并结合估计检测方法给出了评价这两种系统模型性能的误码率(BER)的计算方法。最后本文对两种系统的通信过程进行了仿真,分别计算了误码率的仿真结果和理论结果。通过理论结果和仿真结果的对比,我们验证了文中给出的系统模型的有效性,以及误码率计算的正确性。
[Abstract]:With the advent of the information age, the development of science and technology and the popularity of the Internet, the Internet of things (Internet Of Things,IOT) as an important part of information technology has gradually become the focus of attention. Internet of things, as its name implies, is to connect things through the Internet. As the key technology of the Internet of things, RFID (Radio Frequency Identification,RFID (Radio Frequency Identification) technology is increasingly popular in society. RFID identifies specific targets by radio and reads and writes related data without the need to establish mechanical or optical contact between the identification system and a particular target. However, due to radio frequency identification technology, passive devices can not communicate with each other, so that the real Internet of things can not be realized. At the same time, there are some shortcomings in RFID technology, such as short communication distance, serious path loss and equipment dependence on power supply. These shortcomings have been restricting the development of RFID technology. Fortunately, the environmental backscattering technology derived from RFID technology has made a milestone breakthrough in system development and technology implementation in recent years. Environmental backscattering technology is to create a new network communication mode by using the signal in the surrounding environment (such as TV broadcast signal, mobile phone signal, WiFi etc.). It achieves the purpose of energy acquisition and signal transmission by radio signal which is widely used in backscattering environment. On the one hand, the communication equipment can get rid of the dependence on power supply, on the other hand, the communication distance can be effectively extended. Environmental backscattering technology can also support point-to-point communication between nodes, fully expanding the spatial scope and deployment scale of RFID applications. Because of its novelty and passivity, environmental backscattering technology has attracted the attention and research of many scholars. In this paper, two new wireless communication system models are constructed based on the environment backscattering technology. They are the multi-antenna system model and the multi-label system model, and the communication processes of the two models are described respectively. The corresponding communication protocol is established. Based on the symbolic mathematical modeling of two communication system models, this paper analyzes the system models theoretically, and gives a calculation method of bit error rate (BER) for evaluating the performance of the two models by combining the estimation and detection methods. Finally, the communication process of the two systems is simulated, and the simulation results of the bit error rate and the theoretical results are calculated respectively. By comparing the theoretical results with the simulation results, we verify the validity of the proposed system model and the correctness of the BER calculation.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TP391.44;TN929.5
本文编号：2414050
[Abstract]:With the advent of the information age, the development of science and technology and the popularity of the Internet, the Internet of things (Internet Of Things,IOT) as an important part of information technology has gradually become the focus of attention. Internet of things, as its name implies, is to connect things through the Internet. As the key technology of the Internet of things, RFID (Radio Frequency Identification,RFID (Radio Frequency Identification) technology is increasingly popular in society. RFID identifies specific targets by radio and reads and writes related data without the need to establish mechanical or optical contact between the identification system and a particular target. However, due to radio frequency identification technology, passive devices can not communicate with each other, so that the real Internet of things can not be realized. At the same time, there are some shortcomings in RFID technology, such as short communication distance, serious path loss and equipment dependence on power supply. These shortcomings have been restricting the development of RFID technology. Fortunately, the environmental backscattering technology derived from RFID technology has made a milestone breakthrough in system development and technology implementation in recent years. Environmental backscattering technology is to create a new network communication mode by using the signal in the surrounding environment (such as TV broadcast signal, mobile phone signal, WiFi etc.). It achieves the purpose of energy acquisition and signal transmission by radio signal which is widely used in backscattering environment. On the one hand, the communication equipment can get rid of the dependence on power supply, on the other hand, the communication distance can be effectively extended. Environmental backscattering technology can also support point-to-point communication between nodes, fully expanding the spatial scope and deployment scale of RFID applications. Because of its novelty and passivity, environmental backscattering technology has attracted the attention and research of many scholars. In this paper, two new wireless communication system models are constructed based on the environment backscattering technology. They are the multi-antenna system model and the multi-label system model, and the communication processes of the two models are described respectively. The corresponding communication protocol is established. Based on the symbolic mathematical modeling of two communication system models, this paper analyzes the system models theoretically, and gives a calculation method of bit error rate (BER) for evaluating the performance of the two models by combining the estimation and detection methods. Finally, the communication process of the two systems is simulated, and the simulation results of the bit error rate and the theoretical results are calculated respectively. By comparing the theoretical results with the simulation results, we verify the validity of the proposed system model and the correctness of the BER calculation.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TP391.44;TN929.5
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