本文選題：物聯(lián)網(wǎng) + 無源�。� 參考：《西南科技大學(xué)》2017年碩士論文

【摘要】：環(huán)境無線電后向散射通信系統(tǒng)利用環(huán)境中已存在的射頻信號(hào)作為通信唯一電力來源,從而實(shí)現(xiàn)任何地點(diǎn)下任意通信設(shè)備之間的通信。該系統(tǒng)采用一種新型無線電通信技術(shù),使得無源設(shè)備在不具備電池和有線電源的情況下能收發(fā)信息。其應(yīng)用前景十分廣闊,進(jìn)一步推動(dòng)了移動(dòng)物聯(lián)網(wǎng)的發(fā)展。本文首先介紹了環(huán)境無線電后向散射通信系統(tǒng)的設(shè)計(jì)結(jié)構(gòu)、工作原理及其系統(tǒng)優(yōu)勢。其次分析對(duì)比了4G信號(hào)、Wifi信號(hào)和地面數(shù)字廣播信號(hào)與此系統(tǒng)結(jié)合的可行性,選取地面數(shù)字廣播信號(hào)作為本系統(tǒng)工作環(huán)境信號(hào)。然后設(shè)計(jì)環(huán)境后散射通信系統(tǒng)的發(fā)射機(jī)與接收機(jī)。發(fā)射機(jī)的設(shè)計(jì)包括后向散射調(diào)制電路設(shè)計(jì)及仿真,同時(shí)通過仿真對(duì)比三種編碼方式的檢錯(cuò)能力和抗噪性能,得出最適合此系統(tǒng)的基帶編碼方式為FM0編碼;接收機(jī)的設(shè)計(jì)包括后向散射信息的提取和超低功耗解調(diào)電路的設(shè)計(jì)�，F(xiàn)有的解調(diào)方法無法實(shí)現(xiàn)在無源接收機(jī)上從復(fù)雜的環(huán)境信號(hào)中解調(diào)出微弱的后向散射信號(hào),針對(duì)該問題本文提出了一種解調(diào)方法,并根據(jù)三種不同傳輸率設(shè)計(jì)了超低功耗解調(diào)電路,通過仿真實(shí)驗(yàn)驗(yàn)證了此方案的可行性。
[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.
【學(xué)位授予單位】：西南科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TN926

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