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標題: | 適用於無線都會區域網路用戶端之正交分頻多工基頻接收機實作 Construction of a Baseband Receiver for IEEE 802.16 OFDM Mode Subscriber Station |
作者: | Yi-Ching Lei 雷貽晴 |
指導教授: | 闕志達(Tzi-Dar Chiueh) |
關鍵字: | 正交分頻多工,無線都會區域網路, OFDM,IEEE 802.16, |
出版年 : | 2005 |
學位: | 碩士 |
摘要: | 為了提供電信業者「最後一哩」最佳的解決方案,利用無線通訊的便利性,各住戶大樓只要安裝一符合IEEE 802.16標準之用戶端收發機,則大樓內的使用者不再需要安裝ADSL或Cable Modem,配合無線網卡,即可享受寬頻無線上網的便利。
本論文承襲既有之IEEE 802.16a 正交分頻多工模式用戶端之收發機C程式,加以修改並設計一符合IEEE 802.16-2004 正交分頻多工模式標準之用戶端基頻實體層收發機。其中,傳送機與通道模型是以C程式撰寫,接收機的部分則是先將程式改寫成定點數表示法,再改以Verilog 硬體程式語言實現。接收機針對時間與頻率同步電路、載波頻率飄移與取樣時脈飄移的偵測與補償、保護區間長度之偵測、通道估測與更新等演算法與硬體架構進行開發與研究。此外,尚針對幾個在硬體實現中常用的電路進行比較與分析,選擇最適合的架構,並應用於本論文的接收機設計上。 最後,在各式的通道模型下的模擬結果顯示,本論文所提出的架構可以有效地對抗多重路徑瑞雷衰減、載波頻率與取樣時脈飄移等效應,而成功地將資料解調回來。 In order to let service provider obtain best solution to “last mile” problem, and utilizing the facility of wireless communication, only one transceiver for IEEE 802.16 subscriber station is needed to be set up in each building. All users in the building just co-operate with wireless network card, and then they can enjoy the convenience of broadband wireless access without setting up ADSL or cable modem. The thesis inherit and modify the original C code for IEEE 802.16a OFDM mode subscriber station transceiver, and design a baseband transceiver for IEEE 802.16-2004 OFDM mode subscriber station. Transmitter and baseband channel model are written by C code. Receiver is re-written to fixed-point C code and then transferred to Verilog code. Algorithms and hardware implementation for timing and frequency synchronization, carrier frequency offset(CFO), sampling clock offset(SCO), guard interval length detection as well as channel estimation and updating are embedded in the receiver. Besides, several circuits for hardware implementation are also compared and discussed. The most suitable architecture will be adopted in the thesis. Finally, the simulation results under different channel model shows that the proposed receiver can combat multi-path Rayleigh fading, CFO and SCO effect, and recover the data successfully. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/35306 |
全文授權: | 有償授權 |
顯示於系所單位: | 電子工程學研究所 |
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