隨著網際網路的蓬勃發展，無線上網也變得非常流行，然而無線區域網路已經滿足不了人們的需求，因此、Worldwide Interoperability for Microwave Access 大力推廣無線都會網路(WiMAX)。IEEE 802.16-2004 為WiMAX所依據的無線都會網路標準(WMAN)，主要在擬定無線都會網路實體層(PHY)與控制層(MAC)的技術與規格，其系統應用在2至66 GHz之間，為一點對多點的收發系統(PMP)，調變系統為正交分頻多工，快速傅利葉轉換為256點。無線都會網路可算是無線區域網路的擴大版，它能與WLAN互補互足，以達到無線網路更高的品質。
本論文提出一針對無線寬頻網路標準，設計與實作之基頻處理器。首先使用SystemC語言，建立起標準中所規範的發射機，無線通道模組，以及具有同步功能及還原功能的接收機。接收機的部份為本論文所著重的地方，不但要克服無線通道對訊號所造成的效應，並且需要針對不同的調變技術(發射機)，還原其應得的資料。在完成系統模擬之後，利用Verilog語言進行電路設計與實現，最後並利用FPGA實驗版驗證該電路功能的正確性。
在建構系統架構上，大多採用較簡易､低複雜度的演算法，但在效能上還能達到系統相關要求，這是為了之後在電路設計上，能夠用較小的面積消耗而完成電路設計。在電路設計上，採用不同的簡化法以及取代法，為了是能夠讓整體的電路更具有競爭力，不過這都要在能達到系統要求下所做的改進。本論文不但建立了符合WiMAX的一個收發機，並且在電路設計上做了許多的簡化設計，希望能對無線網路有所助益。

With the growth of the Internet, wireless communications also becomes very popular. But the wireless local area network (WLAN) couldn’t achieve the needs of the people. Therefore, Worldwide Interoperability for Microwave Access (WiMAX) striver to spread the wideband wireless networks communication. It is also called wireless metropolitan area network (WMAN) or (WiMAX by Intel). In order to enlarge coverage, IEEE introduces IEEE std. 802.16-2004 as wireless metropolitan area network.

In the proposed thesis, it provides one baseband processor. First, building the models of the transmitter, the wireless channel, and the receiver by using SystemC language. This thesis focuses on the proposed receiver that not only overcomes the effects of the wireless channel, but also restores the modulated data. In system simulations, it can prove that the function works correctly. Then, using Verilog language to design and implement the circuit. Finally, verifying the circuit on FPGA.

In the architecture of the proposed receiver, it adopts more practical algorithms to build the system. That is that the performances can achieve the basic effect basic on the simplifying algorithms. For the circuit design, it uses MSB of the signals to replace the signal in order to release the complexities of the frame detector and frame synchronization. For frequency synchronization, it adopts the pipeline stages to implement the circuit. This thesis not only builds a whole transceiver conforming to WiMAX, but also designs many simplifying circuit for the proposed system. I hope it is useful for the wireless network.

[1] IEEE std. 802.11a-1999, 30 Dec. 1999.
[2] K. Wongthavarawat and A. Ganz, “IEEE 802.16 Based Last Mile Broadband Wireless Military Networks with Quality of Service Support,” IEEE Military Commun. , vol. 2, pp. 779-784, Oct. 2003.
[3] IEEE std. 802.16-2004, Oct. 2004.
[4] Draft Amendment to IEEE Standard for Local and metropolitan area networks, Part 16: Air Interface for Broadband Wireless Access Systems– Amendment for Physical and Medium Access Control Layers for Combined Fixed and Mobile Operation in Licensed Bands (IEEE P802.16e/D2), April, 2004.
[5] John G. Proakis, “Digital Communications,” New York: McGraw- Hell, 1995.
[6] G. Singh and A. Alphones, “OFDM Modulation Study for a Radio-over-Fiber System for Wireless LAN (IEEE 802.11a),” In Proc. Commun. , vol. 3, pp. 1460-1464, Dec. 2003.
[7] M. Speth, S. A. Fechtel, G. Fock, and H. Meyr, “Optimum Receiver Design for Wireless Broad-Band Systems Using OFDM----Part I,” IEEE Trans. Commun., vol. 49, pp. 1668-1677, Nov. 1999.
[8] M. Speth, S. A. Fetchtel, and H. Meyr, “Optimum Receiver Design for OFDM-Based Broadband Transmission----Part II: A Case Study,” IEEE Trans. Commun., vol. 49, pp. 571-578, April 2001.
[9] S. Johansson, P. Nilsson, and M. Torkelson, “Implementation of an OFDM Synchronization Algorithm,” Circuits and Systems, 1999. 42nd, vol. 1, pp. 228-231, Aug. 1999.
[10] A. Fort and W. Eberle, “Synchronization and AGC Proposal for IEEE 802.11a Burst OFDM Systems,” Global Telecom. , vol. 3, pp. 1335-1338, Dec. 2003.
[11] B. Yang, K. B. Letaief, R. S. Cheng, and Z. Cao, “An Improved Combined Symbol and Sampling Clock Synchronization Method for OFDM Systems,” Wireless commun. and Network 1999, vol. 3, pp. 1153-1157, Sept. 1999.
[12] N. Mochizuki, Y. Matsumoto, M. Mizoguchi, T. Onizawa, and Y. Matsumato, “A High Performance Frequency and Timing Synchronization Technique for OFDM,” Global Telecom. vol. 6, pp. 3443-3448, Nov. 1998.
[13] S. A. Fechtel, “OFDM Carrier and Sampling frequency synchronization and its performance on stationary and mobile channels, ” IEEE Trans. Consum. , vol. 46, pp. 438-441, Aug. 2000.
[14] J. J. van de Beek, M. Sandell, and P. O. Borjesson, “ML Estimation of Time and Frequency Offset in OFDM systems,” IEEE trans., vol. 45, pp.1800-1805, July 1997.
[15] N. Balamurali and D. Jalihal, “An Efficient Algorithm for Joint Carrier Frequency Offset and Channel Estimation in IEEE 802.16 OFDM System,” Wireless com., 2004 1st International Symposium, pp. 428-432, 2004.
[16] S. A. Fechtel, “ Performance of OFDM Carrier and Sampling Frequency Synchronization on Stationary and Mobil Channels,” IEEE trans. Consum. , pp. 18-19, 2000.
[17] C. S. Peng and K. A. Wen, “Synchronization for Carrier Frequency Offset in Wireless LAN 802.11a System,” Wireless commun., The 5th International Symposium, vol. 3, pp. 1083-1087, Oct. 2002.
[18] F. Classen and H. Meyr, “Frequency synchronization algorithms for OFDM systems suitable for communication over frequency selective fading channels,” IEEE Vehicular Technology Conference, 1994, Volume 3, pp. 1655-1659, June 1994.
[19] A. V. Oppenheim, Ronald, and W. Schafer, “Discrete-Time Signal Processing,” Prentice-Hall, Inc., New Jersey, 1989.
[20] S. W. Km and K. H. Tchah, “Performance Analysis of Adaptive Equalizer Design for OFDM Wireless LAN, ”IEEE Trans. Consum., vol.50, pp.512-516, May 2004.
[21] S. A. Fechtel and A. Blaickner, “Efficient FFT and Equalizer implementation for OFDM Receivers,” IEEE Trans. Commun. , vol. 45, pp. 1104-1107, Nov. 1999.
[22] F. M. Gardner, “Interpolation in digital modems—Part I: Fundamentals,” IEEE Trans. Commun., vol. 41, pp. 502-508, Mar. 1993.
[23] F. M. Gardner, “Interpolation in digital modems—Part II: Implementation and Performance,” IEEE Trans. Commun., vol. 41, pp. 998-1008, June 1993.
[24] P. Y. Tsai, H. Y. Kang, and T. D. Chiueh, “Joint weighted least squares estimation of frequency and timing offset for OFDM systems over fading channels,” IEEE Vehicular Technology Conference, 2003, Volume 4, pp. 2543-2547, April 2003.
[25] D. K. Kim, S. H. Do, H. B. Cho, H. J. Choi, and K. B. Kim, “A New Joint Algorithm of Symbol Timing Recovery and Sampling Clock Adjustment for OFDM Systems,” IEEE trans. Consum. , vol. 44, pp. 1142-1149, Aug. 1998.
[26] P. Y. Tsai and T. D. Chiueh, “Frequency-domain interpolation-based channel estimation in pilot-aided OFDM systems,” IEEE VTC, Spring, pp. 420- 424, May 2004.
[27]IEEE std. 802.16.3c-01/29r2 July 2001.
[28] T. Ha, S. Lee, and J. Jim, “Low-complexity correlation System for Timing Synchronization in IEEE802.11a Wireless LANs,” In Proc. Radio and Wireless conference, pp. 51-54, Aug. 2003.
[29] L. Jia, Y. Gao, J. Isoaho, and H. Tenhunen, “A New LVSI-Oriented FFT Algorithm and Implementation,” In Proc. IEEE International, pp. 337–341, 1998.
[30] K. Y. Han, K. Ha, K. M. Sung, and C. W. Lee, “Time Domain Equalization Using Linear Phase Interpolation for OFDM in Time Variant Multipath Channels with Frequency Offset,” IEEE VTC, Spring, pp. 1255-1259, May 2000.
[31] S. Armour, A. Nix, and D. Bull, “Complexity Evaluation for the Implementation of a Pre-FFT Equalizer in an OFDM Receiver,” IEEE trans. Consum. , vol. 46, pp. 428-437, Aug. 2000.