研究生: |
鐘文鍇 Wen-Kai Zhong |
---|---|
論文名稱: |
應用於可見光通訊之廣角追光接收模組 Wide-Angle Receivers for Visible Light Communication |
指導教授: |
宋峻宇
Jiun-Yu Sung |
口試委員: |
張勝良
Sheng-Lyang Jang 廖顯奎 Shien-Kuei Liaw |
學位類別: |
碩士 Master |
系所名稱: |
電資學院 - 電子工程系 Department of Electronic and Computer Engineering |
論文出版年: | 2023 |
畢業學年度: | 111 |
語文別: | 中文 |
論文頁數: | 85 |
中文關鍵詞: | 可見光通訊 、自動追光系統 、角度多樣性接收器 |
外文關鍵詞: | Visible Light Communication, Automatic Tracking System, Angle Diversity Receiver |
相關次數: | 點閱:403 下載:0 |
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室內無線通訊是無線網路的一項關鍵應用場域,並隨著VR (Virtual Reality )等高流量娛樂應用的發展,需要更快的傳輸速率。為了相應的頻寬需求,無線電系統正對毫米波甚至THz波段的傳輸技術進行廣泛討論,相關技術目前在成本與實踐上仍舊具有許多挑戰。相較於無線電,無線光通訊具有極寬廣而免費的頻譜資源,並且隨著包含LED ( Light-Emitting Diode )在內的高速光源之普及,可以與室內照明系統整合,提供額外的經濟附加價值,因此室內可見光通訊成為可以與無線電互補的另一項高潛力方案。高速可見光通訊對於接收信號具有更嚴苛的能量要求,因此實務上可能會與特定光學系統整合,透過聚光/導光等方式提升接收信號能量。聚光等方案增加了光的指向性,因此用戶可能需要動態追蹤光束,以有效將接收器與光束角度對齊。
本論文研究具有動態追光功能的可見光通訊接收器模組。該模組利用具有相對寬頻特性的光電晶體PT ( Phototransistor )與廣接收角的光敏電阻LDR ( Light Dependent Resistor )分別進行通訊與追光,並透過自製載具實現元件不同空間配置的實體,之後透過量測數據反饋,設計並實現接收角180°x180°,且能進行正負1°內追光精準度的接收器模組。該模具可以自動追蹤180°的用戶角度偏移。實時傳輸表現方面,在180°x180°的空間範圍內,其10°內隨機旋轉後所接收的音訊與0°靜態位置所接收的音訊相比較,可表現出0.7的最佳估計相關性。
The developing high-bandwidth entertainment applications like 3D display and virtual reality (VR) have pushed the wireless traffic. In order to get sufficient transmission bandwidth, radio spectrum up to the millimeter-wave and terahertz regions is extensively considered. These high-frequency options are still expensive and are demanding for tremendous studies for practical applications. Other than the radio options, optical wireless communication is attracting lots of attention for its abundant free spectrum resources. Besides, with the increasing applications of the high-speed light sources like light-emitting diodes (LEDs) in the indoor illumination systems, visible light communication (VLC) is also popular as a complement to the indoor bandwidth requirements. Considering the available power budget, high-speed VLC may apply specific optical systems to enhance the signal receiving power by steering/focusing the light. The light beams are then more directional, and the mobile users must dynamically align their receivers towards light sources.
This thesis designs and tests various VLC receivers capable of tracking the light. Each receiver includes a relatively wideband phototransistor for communication and multiple wide-angle photo-resistors for light tracking. Each set of the phototransistors and the photo-resistors is specially arranged on the shape-customized mounts printed by the 3D printer. The light tracking performance of each receiver is tested and iteratively feedback for designing the next receiver. The final receiver can automatically track the light source with full angle range of 180°x180° under a tuning resolution of 1°. Under a real-time test which randomly rotating the receiver within ±10° around the light center, the detected signal wave shape has a correlation of 0.7 to the 0° static audio.
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