| 研究生: |
李奕賢 Li, I-Hsien |
|---|---|
| 論文名稱: |
窄頻物聯網之定位演算法開發與效能評估 Development and Evaluation of Positioning Algorithms in NB-IoT |
| 指導教授: |
陳昭羽
Chen, Chao-Yu |
| 學位類別: |
碩士 Master |
| 系所名稱: |
工學院 - 工程科學系 Department of Engineering Science |
| 論文出版年: | 2019 |
| 畢業學年度: | 107 |
| 語文別: | 中文 |
| 論文頁數: | 86 |
| 中文關鍵詞: | 窄頻物聯網 、觀測到達時間差 、定位 、功率延遲概觀 、到達時間 |
| 外文關鍵詞: | NB-IoT, observed time difference of arrival (OTDOA), positioning, power delay profile (PDP), time-of-arrival (ToA) |
| 相關次數: | 點閱:58 下載:0 |
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在本論文中,我們提出了一種新的到達時間演算法,適用於窄頻物聯網物理層中的定位技術,該算法通過估測功率延遲概觀的第一個有效的峰值來估計發送的窄頻定位參考訊號的到達時間。我們通過接收頻域上的窄頻定位參考訊號,經由快速傅立葉反轉換成時域上的功率延遲概觀以及雜訊功率進行估測。在典型的窄頻物聯網環境中,由於訊號雜訊比極低,所以估測雜訊功率的準確性在估測到達時間中是至關重要的。快速傅立葉轉換過程中,我們也提出降低複雜度之方法,使用較少點的快速傅立葉轉換,經由Sinc內插法可以與多點的快速傅立葉轉換在到達時間誤差性能相當接近且複雜度較小,模擬結果顯示,所提出的到達時間估測方法在各種情況下的表現都優於傳統方法。
In this thesis, we propose a new time-of-arrival (ToA) algorithm for positioning in physical layer of narrowband internet-of-things (NB-IoT) technology. This algorithm estimates the ToA of transmitted narrowband positioning reference signals (NPRSs) by detecting the first valid tap of estimated power delay profile (PDP). We estimate the PDP as well as the noise power in the time domain via IFFT transformation of received frequency domain NPRSs.
The accuracy of the estimated noise power is crucial in the ToA estimation since the SNR is extremely low in typical NB-IoT scenarios. The simulations show that the proposed ToA estimation method outperforms the conventional method and performs well in various scenarios.
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校內:2024-12-31公開