臺灣博碩士論文加值系統

超寬頻(Ultra-WideBand, UWB)無線通訊系統為近年來高速無線個人區域網路(Wireless Personal Area Networks, WPAN)中最有潛力的標準。本論文中，我們將針對以正交分頻多工(Orthogonal Frequency Division Multiplexing, OFDM)為核心架構的UWB無線通訊系統接收機，作基頻訊號處理與電路設計。基頻訊號處理的部份包含時間同步演算法、頻率同步演算法，通道估測演算法與補零字首(Zero-Padded Prefix, ZP)處理等，並經模擬確認符合標準要求。電路設計的部分包含將已確定的演算法以硬體描述語言撰寫成verilog的形式，並作行為層(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)上做驗證。

Ultra-wideband (UWB) radio has been proposed for physical layer standard of the future high-speed wireless personal area networks (WPAN). In this thesis, the receiver baseband signal processing and hardware implementation of a multi-band orthogonal frequency division multiplexing (MB-OFDM) system is investigated. The baseband signal processing algorithms include time domain synchronization, frequency domain synchronization, channel estimation, and zero padded process. The developed algorithms are shown to fulfill the requirements of the system specifications and are implemented using Verilog hardware description language (HDL), which is downloaded to Xilinx FPGA (Field Programmable Gate Array) for system verification.

第一章 緒言…………………………………………………………………………....1
1.1 研究動機………………………………………………………………………1
1.2 論文架構……………………………………………………….…….….…….2
第二章 MBOA-UWB標準與系統概述…………………………………………..3
2.1 操作頻率範圍.………………………………………………………………...3
2.2 MBOA-UWB 0v9標準分析………………………………………………..…3
2.2.1 PLCP Preamble ...………………………………………………………6
2.2.2 PLCP Header……………………………………………………………9
2.2.3 PSDU .......………………………………………………….................10
2.3 傳送機架構……………………………………………………………..........19
2.4 通道模型………………………………………………....……………..........19
第三章 接收機基頻演算法設計...…………………………....…………….........25
3.1 接收機架構.…………………………………………………………..……...25
3.2 時間同步演算法…………………………………………….………..……...25
3.2.1 封包同步……………………………………………………………....26
3.2.2 碼框同步……………………………………………………..………..30
3.3 頻率同步演算法……………………………………………………………..31
3.3.1 粗略頻率同步…………………………………………………………32
3.3.2 相位追蹤……………………………………………………………....35
3.4 通道估測……………………………………………………………………..37
3.5 補零字首…………………………………………………………………..…41
第四章 接收機整合電路設計……………………………………………..………44
4.1 接收機整合架構…….………………………………………………..……...44
4.2 系統控制電路設計.…………………...…………………….…………...…..44
4.3 接收機系統整合…………………………………………………………..…48
第五章 模擬與量測結果...…………..………………………...………...................52
5.1 UWB系統效能模擬...…………………………………....…………….........52
5.2 UWB接收機實測…………………………………………………………....55
第六章 結論與未來展望…………………………………………………...………60
參考文獻…………………………………………………...………………………..…61

[1] MBOA PHY Layer Technical Specification Version0v9。
[2] IEEE P802.15-02/490r1-SG3a
[3] J.-J. van de Beek, M. Sandell, M. Isaksson and P.O. Borjesson, “Low-complex frame synchronization in OFDM systems,” in Proceedings of IEEE International Conference Universal Personal Communication, Toronto, Canada, Sep. 27-29, 1995, pp. 982-986.
[4] J.-J. van de Beek, M. Sandell, P.O. Borjesson, “ML Estimation of Time and Frequency Offset in OFDM systems,” in IEEE Transactions on Signal Proccessing, Vol. 45, No. 7, July 1997.
[5] Meng-Han Hsieh and Che-ho Wei, “A Low-complex Frame Stnchronization and Frequency Offset Compresation Scheme for OFDM Systems over Fading Channels,” in IEEE Transactions on Vehicular Technology, Vol. 48, No. 5, Sep. 1999.
[6] D.K. Kim, S. H. Do, H. B. Cho, H. J. Choi, K. B. Kim, “A New Joint Algorithm of Symbol Timing Recovery and Sampling Clock Adjustment for OFDM Systems,” IEEE Transactions on Consumer Electronics, Vol. 44, No. 3, Aug. 1998, pp. 1142-1149.
[7] T.M. Schmidl, D.C. Cox, “Low-Overhead, Low-Complexity [Burst] Synchronization for OFDM,” IEEE International Conference on Communications, Vol. 3, 1996, pp. 1301-1306.
[8] John Terry and Juha Heiskala “OFDM Wireless LANs Theoretical and Practical guide”
[9]Louis L. Scharf, Statistical Signal Processing: Detection, Estimation and Time Series Analysis, Addison-Wesley, 1991.
[10] H. Stark and J. W. Woods, Probability and Random Processes with Applications to Signal Processing, Prentice-Hall, 3rd, 2002.
[11]W. G. Jeon, K. H. Paik, and Y. S. Cho, “An efficient channel estimation technique for OFDM systems with transmitter diversity,” IEICE Trans. Commun., vol. E84-B, no. 4, pp. 967-974, April 2001.