基於物聯網應用之 ACO-OFDM 可見光通訊收發機實現

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姓名

賴健銘(Jian-Ming Lai) 查詢紙本館藏

畢業系所

通訊工程學系在職專班

論文名稱

基於物聯網應用之 ACO-OFDM 可見光通訊收發機實現
(Realization of ACO-OFDM Visible Light Communication Transceiver Based on Internet of Things Applications)

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至系統瀏覽論文 (2024-12-31以後開放)

摘要(中)

隨著無線通訊逐漸普及，生活上手機通訊及物聯網應用都離不開通訊，除了電磁波為通訊介質傳遞外，使用光強度調變來完成通訊功能稱之為可見光通訊，許多文獻已經探討可見光通訊使用光通訊不對稱剪裁正交多頻分工調變(ACO-OFDM)的理論推導及使用情境並做模擬實驗證明其可行性，本文基於已知調變技術下從無到有設計可見光通訊發射與接收硬體電路，發射端使用可程式化數位類比轉換器，使輸入訊號為任意值，搭配驅動電路做光訊號調變，接收端使用市售手機後攝裝置頻閃偵測器，期望最終應用能與手機現有感測器結合，使手機應用無須額外增加硬體電路，評估市售感測器，確認最快取樣率來決定系統應用頻寬，並做實驗確認與發射端結合後通道響應是否理想。使用Matlab做為開發平台並整合收發機控制，參考802.11a建立通訊格式，一樣使用前導符作為封包邊界偵測，提出方法對取樣頻率偏移及通道響應產生的干擾作補償，最終驗證資料經過可見光通訊電路後，接收端能正常還原原始資料。

摘要(英)

With the increasing popularity of wireless communication, mobile phone communication and Internet of Things applications are inseparable from communication in daily life. In addition to the transmission of electromagnetic waves as the communication medium, the use of light intensity modulation to complete the communication function is called visible light communication (VLC). Many literatures have discussed visible light communication. Using the theoretical derivation and application scenarios of Asymmetrically Clipped Optical Orthogonal Multi-Frequency Division Modulation (ACO-OFDM) in optical communication, and doing simulation experiments to prove its feasibility, this paper designs visible light communication platform from scratch based on known modulation technology. In the receiving hardware circuit, the transmitter uses a programmable digital-to-analog converter to make the input signal any value, and the driver circuit is used to modulate the optical signal. The receiving side uses a commercially available mobile phone rear camera device flicker detector. It can be combined with the existing sensor of the mobile phone without adding additional hardware circuits, evaluate the commercially available sensors, confirm the fastest sampling rate to determine the system application bandwidth, and conduct experiments to confirm whether the channel response is ideal after light transmitting with the LED. Use Matlab as the development platform and integrate the transceiver control method by USB HID protocol, establish the communication system specification with reference to 802.11a, also use the preamble as packet boundary detection, and propose a method to compensate for the interference caused by sampling frequency offset and channel response, after the final verification data passes through the visible light communication circuit, the receiving end can restore the original data.

關鍵字(中)

★ 光通訊不對稱剪裁正交多頻分工調變
★ 物聯網

關鍵字(英)

★ ACO-OFDM
★ IoT

論文目次

摘要 i
Abstract ii
致謝 iii
目錄 iv
圖目錄 vi
表目錄 ix
第一章緒論 1
1.1 前言 1
1.2 文獻回顧 2
1.3 研究動機 4
1.4 論文架構 4
第二章 LED通訊技術介紹 5
2.1 訊號調變 5
2.1.1 振幅偏移調變 5
2.1.2 頻率偏移調變 6
2.1.3 脈衝寬度調變 7
2.1.4 正交分頻多工調變 7
2.1.5 光通訊直流偏壓型正交分頻多工調變 10
2.1.6 不對稱剪裁正交分頻多工調變 11
第三章 LED通訊硬體平台 14
3.1 LED通訊接收端硬體設計 14
3.1.1 環境光感測器 15
3.1.2 微控制器 16
3.1.3 接收端系統流程 17
3.2 LED通訊發射端硬體設計 18
3.2.1 放大器 18
3.2.2 低通濾波器 19
3.2.3 發射端系統流程 26
第四章 LED通訊傳輸系統 27
4.1 LED通訊系統規格 28
4.2 Preamble 29
4.2.1 Short Preamble 29
4.2.2 Long Preamble 31
4.3 Cyclic Prefix 32
4.4 Sampling Frequency Offset Synchronization 32
4.4.1 Sampling Frequency Offset Estimation 34
4.5 Channel Estimation 34
4.5.1 Pilot Insertion 35
4.5.2 Loop Filter 36
第五章模擬實驗 38
5.1 模擬 38
5.2 實作 40
第六章結論 53
參考文獻 54

參考文獻

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指導教授

張大中(Dah-Chung Chang)

審核日期

2023-7-11

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