適用於行動式無線都會區域網路中正交分頻多工存取模式之基頻接收機設計與實作

為了提供電信業者「最後一哩」最佳的解決方案，IEEE 802.16標準應運而生。利用無線通訊的便利性，各網路用戶只需安裝一符合IEEE 802.16標準之用戶端收發機，即可享受寬頻無線上網的便利，而省去業者佈線的高昂成本。本論文設計一符合IEEE 802.16e-2005正交分頻多工存取模式標準之用戶端基頻實體層接收機，並可操作在靜態或動態通道環境。其中，傳送機、通道模型與接收機是以C程式撰寫，接收機的部分則再將程式改寫成以定點數實現。接收機針對基台搜尋、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、通道估測、載波間干擾消除等演算法與電路架構進行開發與研究。其中，本論文提出一套針對802.16正交分頻多工存取模式的基台搜尋演算法，以及一個低運算量低硬體成本的載波間干擾消除等化器，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、動態環境下的都普勒效應、載波頻率與取樣時脈飄移等效應，而成功地將資料解調還原。

關鍵字

正交分頻多工存取

並列摘要

In order to let service provider obtain best solution to “last mile” problem, Standard IEEE 802.16 is established. Utilizing the facility of wireless communication, only a transceiver for IEEE 802.16 subscriber/mobile station is needed and all users can enjoy the convenience of broadband wireless access without the need of setting up ADSL or cable modem. This thesis designs for a baseband receiver for IEEE 802.16e-2005 OFDMA mode subscriber/mobile station, and can be operated in both static and dynamic environment. The transmitter, baseband channel model, and receiver are written by C code, and the receiver part is further implemented by fixed-point C code. Algorithms and circuit implementation for cell search, timing and frequency synchronization, carrier frequency offset(CFO)/ sampling clock offset(SCO) estimation and compensation, channel estimation and inter-carrier-interference(ICI) cancellation are all embedded in the receiver architecture. Besides, this thesis proposes a cell search algorithm specified for IEEE 802.16 OFDMA mode and also a low-computation, low hardware cost ICI cancellation equalizer. They are adopted in the proposed reciever. Finally, the simulation results under different channel model shows that the proposed receiver can combat multi-path Rayleigh fading, Doppler effect in high mobility, CFO and SCO effect, and recover the data successfully

並列關鍵字

Orthogonal Frequency Division Multiple Access

參考文獻

[1] IEEE Std 802.16-2004, Standard for Local and Metropolitan Area Networks Part 16: Air Interface For Fixed and Mobile Broadband Wireless Access Systems.

[6] Sang-Jung Yang, Yi-Ching Lei, and Tzi-Dar Chiueh,” Design and Simulation of a Baseband Transceiver for IEEE 802.16a OFDM-Mode Subscriber Stations,” IEEE Conf. APCCS, Dec 6-9, 2004.

[8] P. Dent , G.E. Bottomley, and T. Croft, “Jakes Fading Model Revisited,” IEEE Electron. Lett., vol. 29, no. 13, pp. 1162-1163, Jun. 1993.

[9] Huan Su, Jianhua Zhang, Ping Zhang, “A preamble-based Cell Search Scheme for OFDMA Cellular Systems”, IEEE Conf. ICNICONSMCL April 2006.

[10] D. S. Kwon, H. Lim, and H.K. Park, “Preamble Structure for Single Frequency Cellular Systems Using Orthogonal Frequency Division Multiplexing”, IEEE Transactions on Consumer Electronics, Vol.50, No.1, Feb 2004.

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適用於行動式無線都會區域網路中正交分頻多工存取模式之基頻接收機設計與實作

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