近年來無人飛行系統的應用逐漸成為主流討論的議題，從原本應用於軍事方
面拓展到大眾以及商業上的應用，如交通壅塞地區的監控系統、高危險救災地區
的偵測視察甚至大範圍農業的農作物狀態監控等。
在本篇論文目標致力於設計一格無線通訊系統應用於無人飛行系統上，而主
要使用情境為將無人機空拍的影像傳輸回基地台。在本篇論文裡分為兩個主要目
標，第一為頇達到45 百萬位元(Mbps)每秒的資料傳輸量，在最高飛行速度為200
公里每小時的情況下，第二則為在達到743.5 公里每小時相較於第一目標更高速
的飛行通道下達到3.5 百萬位元每秒的資料傳輸量。我們透過參考L 頻帶數位飛
航通訊系統(LDACS1)以及多篇討論飛航通道的文獻訂定出適用於我們情境下的
傳輸通道模型。透過正交分頻多工系統(OFDM)系統的參數設計以及模擬結果在
合理範圍內挑選最適用於該情境的系統參數。我們分別選用了256 點以及2048
點的快速傅立葉轉換(FFT)，分別擁有31.25 千赫茲(kHz)以及7.63 千赫茲子載波
頻寬和8微秒(μs)的循環字首(cyclic prefix)來克服通道的不理想特性。最後提出
的傳收端為結合空頻區塊碼(SFBC)二傳輸天線對一接收天線的系統架構，以及
里德索羅門碼(Reed Solomon code)加上迴旋碼(convolutional code)的錯誤更正碼；
兩項技術分別至少提供增進了8 分貝(dB)以及3.75 分貝的系統效能。在最後討論
也顯示出在系統接收端同步部份加上不理想特性的模擬結果。

For the past few years, the application of unmanned aircraft vehicles (UAVs), or unmanned
aircraft system (UAS) have been a rising issue. Except for the military aspect, they widely
used on inspecting the highly risky fields such as volcanic eruption, agriculture with sensor
detect soil, crop and water condition or conflagration for science research and firefighter res-
cue.
In the thesis, our goal is to design a communication system applied on the UAVs. The
scenario is the unmanned aircraft vehicles equipped camera to transmit the video through the
ground station. There are two cases in our scenario, first has maximum cruise speed 200km
per hour, the distance from the ground station to aircraft has 150km and a data rate 45Mbps
required. Another case has maximum cruise speed 0.7 Mach number (743.5km per hour) and
also has 150km transmission distance. We define the aeronautical channel respectively, calcu-
late the link budget, then an OFDM system based design is presented. The system parameters
such as subcarrier spacing, cyclic prefix length and the pilots arrangement evaluation which is
effected by the different Doppler frequency, delay spread and data rate requirement. We pro-
posed an OFDM system with 256 and 2048 fast Fourier transform (FFT) size, which has large
subcarrier spacing 31.25kHz and 7.63kHz with 8s cyclic prefix (CP) duration to overcome
the frequency-selective fading channel. The proposed transceiver includes two transmitters
and one receiver with space frequency block code and channel coding which concatenated
Reed Solomon (255,239) codes and convolutional codes, both the techniques can improve
8dB and 5dB compared with the single input and single output OFDM system respectively.
The timing and frequency synchronization are also discussed.

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