本論文的主要目的，在闡述IEEE 802.16-2004全球互通微波存取(Worldwide Interoperability for Microwave Access, WiMAX)無線通訊系統的基頻接收機設計與硬體實現。我們首先用Matlab建立電腦浮點模擬平台(Floating Point Simulation Platform)，除了建立傳送訊號與通道模型之外，並針對接收機基頻訊號處理的演算法做效能驗證，以確保接收機效能符合標準所訂定的最低效能。然後我們針對接收機的各個功能方塊(主要包括封包偵測、時間同步、頻率同步、通道估測、快速傅立葉轉換等)，進行硬體架構的設計與系統整合，並用Matlab進行電腦定點模擬(Fixed Point Simulation)。最後我們以Verilog硬體描述語言(Hardware Description Language, HDL)進行硬體設計，並在電腦上進行行為層(Behavioral Level)模擬與邏輯層(Gate Level)模擬，確認無誤後將設計完成的電路下載到現場可程式化閘陣列 (Field Programmable Gate Array, FPGA)實驗板上驗證電路功能的正確性。

This thesis describes the design and implementation of the baseband receiver for the IEEE 802.16-2004 Worldwide Interoperability for Microwave Access (WiMAX) wireless communications systems. Firstly, a Matlab floating-point simulation platform is built for system design. In addition to the transmitted signals and the channel models, the signal processing algorithms for the baseband receiver are verified to meet the system performance required by the standard. Then the receiver functional blocks, which include packet detection, timing synchronization, frequency synchronization, channel estimation, and the 256-point fast Fourier transform (FFT), are designed and integrated. Fixed point simulation is also conducted by using Matlab. The hardware implementation is realized by using the Verilog Hardware Description Language (HDL). Behavioral level and gate level simulations are also conducted to verify the system design. The design is downloaded to the Field Programmable Gate Array (FPGA) for system verification.

目錄

第一章 緒論…………………………………………………………………………....1
1.1 無線網路的發展………………………………………………………………1
1.1.1 無線個人網路…………………………………………………………2
1.1.2 無線區域網路…………………………………………………………2
1.1.3 無線都會網路…………………………………………………………3
1.1.4 無線廣域網路…………………………………………………………3
1.2 研究動機……………………………………………………….…….….…….3
1.3 論文架構……………………………………………………….…….….…….4
第二章 OFDM技術原理簡介………………………………………………….. …5
2.1 OFDM基本原理介紹………………………………………………... 5
2.2 傳統的OFDM系統架構………………………………………………………6
2.3 利用離散傅立葉轉換的OFDM系統架構……………………………........…8
2.4 保護區間與循環字首…………………………………………………….......9
2.5 結論……………………………………………………....….......….......…. .12
第三章 IEEE 802.16-2004無線都會網路標準簡介...……………………....14
3.1 攪亂器.……………………………………… …………………..……....... ..15
3.2 迴旋編碼器…………………………………………….………..……... . . . .16
3.3 交錯器……………………………………………………………………….17
3.4 資料調變……………………………………………………………………..18
3.5 領航碼調變…………………………………………………………………. 19
3.6 前置碼調變…………………………………………………………………. 20

第四章 IEEE 802.16-2004接收機演算法介紹………………………………22
4.1 封包偵測…….……….……………………………………………..……... .22
4.1.1 封包偵測演算法介紹…………………………………………………22
4.1.2 使用滑動框架的封包偵測演算法介紹………………………………23
4.1.3 封包偵測硬體架構……………………………………………………24
4.2 封包取樣點的同步…………………...…………………….…………...…..25
4.2.1 短前置碼同步演算法…………………………………………………26
4.2.2 保護區間長度估測演算法……………………………………………26
4.3 頻率偏移的估測與補償…………………………………………………..…28
4.3.1 頻率偏移估測演算法…………………………………………………28
4.3.2 數位座標旋轉演算法…………………………………………………29
4.3.3 數位座標旋轉法硬體架構……………………………………………32
4.4 快速傅立葉轉換………………………………………………………………34
4.4.1 快速傅立葉轉換硬體架構…………………………………………36
第五章 接收機硬體模擬結果...….………………………...………...................38
5.1 封包偵測模擬結果...…………………………………....…………….........38
5.2 頻率偏移補償模擬結果…………………………………………………....41
5.3 快速傅立葉轉換模擬結果…………………………………………………43
第六章 結論與未來展望…………………………………………………...………45
參考文獻…………………………………………………...………………………..…46

參考文獻
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