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| 研究生： |
陳振瑋 Chen, Jhen-Wei |
|---|---|
| 論文名稱： |
LoRa調變中符號錯誤率之研究 A study of the symbol error rate in a LoRa modulation system |
| 指導教授： |
黃政吉
Huang, Jeng-Ji |
| 口試委員： |
黃政吉
Huang, Jeng-Ji 熊大為 Shiung, David 馮輝文 Ferng, Huei-Wen |
| 口試日期： | 2023/06/13 |
| 學位類別： |
碩士 Master |
| 系所名稱： |
電機工程學系 Department of Electrical Engineering |
| 論文出版年： | 2023 |
| 畢業學年度： | 111 |
| 語文別： | 中文 |
| 論文頁數： | 57 |
| 中文關鍵詞： | 物聯網 、LoRa調變 、符號錯誤率 、瑞利隨機變數 、萊斯隨機變數 |
| 英文關鍵詞： | Internet of Things, LoRa modulation, the symbol error rate, Rayleigh random variables, Rice random variables |
| 研究方法: | 實驗設計法 、 比較研究 |
| DOI URL： | http://doi.org/10.6345/NTNU202301081 |
| 論文種類： | 學術論文 |
| 相關次數： | 點閱：89 下載：6 |
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遠程（LoRa）調變系統採用線性調頻展頻（CSS）技術，旨在提供低功率和寬範圍的通信範圍（半徑可達數公里）。即當設備選擇展頻因子（SF）時，通過以與2𝑆𝐹成比例的速率掃描整個頻寬來發送每個符號。在接收處，首先使用去線性展頻信號去除接收信號的CSS部分，然後使用離散傅里葉變換（DFT）提取符號中包含的信息。本論文計算了LoRa調變系統的符號錯誤率。如將要說明的，當N-1個獨立瑞利隨機變量的最大值大於獨立萊斯隨機變量時，會出現符號錯誤，其中N是DFT中點的數量。與相關工作相比，從 MATLAB 仿真中獲得的數值結果顯示出很高的準確性。
A chirp spread spectrum (CSS) technique is adopted n a long range (LoRa) modulation system, which aims at providing low power and a wide range of communication range (of radius up to several kilometers). That is, when a spread factor (SF) is selected by a device, each symbol is sent by sweeping the entire bandwidth under a rate proportional to 2𝑆𝐹. At the receiver, a de-chirp signal is first used to remove the CSS part of the received signal and the discrete Fourier transform (DFT) is then employed to extract the information contained in the symbol. In this thesis, the symbol error rate of a LoRa modulation system is calculated. As will be illustrated, a symbol error occurs when the maximum of (N-1) independent Rayleigh random variables is larger than an independent Rician random variable, where N is the number of points in the DFT. Numerical results obtained from MATLAB simulations show great accuracy, as compared to related works.
物聯網發展現況、應用場域、全球趨勢
https://zh.oosga.com/iot/
使用LoRa進行開發促成低傳輸率的遠距IoT應用
https://www.digikey.tw/zh/articles/develop-lora-for-low-rate-long-range-iot-applications
Shannon–Hartley theorem – Wikipedia
https://en.wikipedia.org/wiki/Shannon%E2%80%93Hartley_theorem
直接序列展頻–維基百科，自由的百科全書
https://zh.wikipedia.org/zh-tw/%E7%9B%B4%E6%8E%A5%E5%BA%8F%E5%88%97%E6%89%A9%E9%A2%91
正交分頻多工–維基百科，自由的百科全書
https://zh.wikipedia.org/zh-tw/%E6%AD%A3%E4%BA%A4%E9%A0%BB%E5%88%86%E5%A4%8D%E7%94%A8
Complex normal distribution–Wikipedia
https://en.wikipedia.org/wiki/Complex_normal_distribution
Probability theory–Wikipedia
https://en.wikipedia.org/wiki/Probability_theory
貝索函數–維基百科，自由的百科全書
https://zh.wikipedia.org/zh-tw/%E8%B4%9D%E5%A1%9E%E5%B0%94%E5%87%BD%E6%95%B0
Laplace's equation–Wikipedia
https://en.wikipedia.org/wiki/Laplace%27s_equation
Helmholtz equation – Wikipedia
https://en.wikipedia.org/wiki/Helmholtz_equation
Frobenius method–Wikipedia
https://en.wikipedia.org/wiki/Frobenius_method
Bessel–Clifford function–Wikipedia
https://en.wikipedia.org/wiki/Bessel%E2%80%93Clifford_function
Laguerre polynomials–Wikipedia
https://en.wikipedia.org/wiki/Laguerre_polynomials
Rayleigh distribution–Wikipedia
https://en.wikipedia.org/wiki/Rayleigh_distribution
Chi distribution–Wikipedia
https://en.wikipedia.org/wiki/Chi_distribution
Rice distribution–Wikipedia
https://en.wikipedia.org/wiki/Rice_distribution
Rician fading–Wikipedia
https://en.wikipedia.org/wiki/Rician_fading
O. Afisiadis, M. Cotting, A. Burg, and A. Balatsouks-Stimmins, “On the Error Rate of the LoRa Modulation With Interference,” IEEE Trans. ON WIRELESS COMMUNICATIONS, vol. 19, no. 2, February 2020
M. Chiani and A. Elzanaty, “On the LoRa modulation for IoT: Waveform properties and spectral analysis,” IEEE Internet Things J., vol. 6, no. 5, pp. 8463–8470, May 2019.
