本論文提出一個架構簡單且方便製造的5.8 GHz負阻抗注入鎖定振盪器將其應用於Wi-Fi都卜勒雷達系統中，該雷達使用華碩筆電內部Wi-Fi模組發射的Wi-Fi調制通訊波做為都卜勒雷達系統的發射訊號源，結合IQ正交解調的接收機架構，進行生理感測的實驗。由於雷達系統所使用的Wi-Fi調制通訊波包含通訊調制成分，會形成振幅調制雜訊(AM Noise)和相位調制雜訊(PM Noise)，使得雷達系統的感測性能不佳，藉由本實驗室提出的注入鎖定技術以及雙通道雜訊抵消法去抑制此兩種Wi-Fi雜訊，使得都卜勒訊號品質提升，進而能夠量測到人體的呼吸和心跳。

This thesis presents a simple and easy-to-manufacture 5.8 GHz negative impedance injection-locked oscillator for use in a Wi-Fi Doppler radar system. The radar uses the Wi-Fi modulated signal provided by the internal Wi-Fi module of an ASUS laptop. The Wi-Fi modulated signal is used as the illumination source of the Doppler radar system that is mainly a quadrature receiver to carry out sensing of human vital signs. Since the Wi-Fi modulated signal used by the radar system contains communication modulation that causes amplitude modulation noise (AM Noise) and phase modulation noise (PM Noise), it will degrade the sensing performance of the radar system. With the help of injection locking technique and the dual-channel noise cancellation method, these two kinds of Wi-Fi noise can be suppressed to improve the quality of the Doppler signal, and thus the human breathing and heartbeat can be measured.

論文審定書 ..........................................................i
摘要 ...............................................................ii
Abstract ..........................................................iii
目錄 ...............................................................iv
圖次 ...............................................................vi
表次 .............................................................viii
第一章 序論 ........................................................1
1.1 研究背景與動機 ..............................................1
1.2 都卜勒雷達簡介與應用 ........................................3
1.3 章節規劃 ....................................................6
第二章 5.8 GHz負阻抗注入鎖定振盪器 ..........................7
2.1 振盪器設計原理 ..............................................7
2.2 5.8 GHz負阻抗注入鎖定振盪器設計 .......................13
2.2.1 前言 .................................................13
2.2.2 負阻抗振盪器設計 .....................................14
2.2.3 模擬與量測結果 .......................................17
2.3 注入鎖定理論 ...............................................20
2.3.1 注入鎖定方程式 .......................................20
2.3.2 穩定條件與鎖定範圍 ...................................23
第三章 5.8 GHz Wi-Fi訊號都卜勒雷達系統 ...................26
3.1 前言 .......................................................26
3.2 雷達系統架構 ...............................................26
3.3 直接降頻正交解調電路 .......................................29
3.3.1 直接降頻解調電路架構 .................................29
3.3.2 降頻解調測試 .........................................33
3.4 直流準位校 .................................................35
3.5 雙通道雜訊抵銷 ..............................................37
3.6 數位訊號處理 ...............................................39
3.7 雷達系統量測 ...............................................40
3.7.1 實驗系統配置 .........................................40
3.7.2 量測結果 .............................................43
3.7.3 5.8 / 2.4 GHz Wi-Fi 都卜勒雷達系統性能比較 .......49
第四章 結論 .......................................................51
參考文獻 ...........................................................52

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