环境无线电后向散射通信系统的设计与仿真

发布时间：2018-04-22 02:09

本文选题：物联网 + 无源　；参考：《西南科技大学》2017年硕士论文

【摘要】：环境无线电后向散射通信系统利用环境中已存在的射频信号作为通信唯一电力来源,从而实现任何地点下任意通信设备之间的通信。该系统采用一种新型无线电通信技术,使得无源设备在不具备电池和有线电源的情况下能收发信息。其应用前景十分广阔,进一步推动了移动物联网的发展。本文首先介绍了环境无线电后向散射通信系统的设计结构、工作原理及其系统优势。其次分析对比了4G信号、Wifi信号和地面数字广播信号与此系统结合的可行性,选取地面数字广播信号作为本系统工作环境信号。然后设计环境后散射通信系统的发射机与接收机。发射机的设计包括后向散射调制电路设计及仿真,同时通过仿真对比三种编码方式的检错能力和抗噪性能,得出最适合此系统的基带编码方式为FM0编码;接收机的设计包括后向散射信息的提取和超低功耗解调电路的设计。现有的解调方法无法实现在无源接收机上从复杂的环境信号中解调出微弱的后向散射信号,针对该问题本文提出了一种解调方法,并根据三种不同传输率设计了超低功耗解调电路,通过仿真实验验证了此方案的可行性。
[Abstract]:The environment radio backscatter communication system uses the existing radio frequency signal in the environment as the unique power source to realize the communication between any communication devices at any location. The system adopts a new radio communication technology, which enables passive equipment to send and receive information without batteries and wired power. Its application prospect is very broad, further promoted the development of mobile Internet of things. This paper first introduces the design structure, working principle and system advantages of the environment radio backscattering communication system. Secondly, the feasibility of combining 4G wifi signal and terrestrial digital broadcast signal with this system is analyzed and compared, and the terrestrial digital broadcasting signal is selected as the working environment signal of the system. Then the transmitter and receiver of the environment backscattering communication system are designed. The design of transmitter includes the design and simulation of backscattering modulation circuit. At the same time, by comparing the error detection ability and anti-noise performance of the three coding methods, the base-band coding mode is obtained as FM0 code which is the most suitable for this system. The design of receiver includes the extraction of backscattering information and the design of ultra-low power demodulation circuit. The existing demodulation methods can not demodulate weak backscatter signals from complex ambient signals on passive receivers. In this paper, a demodulation method is proposed to solve this problem. The ultra-low power demodulation circuit is designed according to three different transmission rates, and the feasibility of the scheme is verified by simulation experiments.
【学位授予单位】：西南科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN926

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