歐規的地面數位電視廣播系統(DVB-T)使用了正交分頻多工(OFDM)的技術，在無線傳輸的通道下能提供高速率傳輸、高效率頻譜使用率的多媒體服務及對抗頻率選擇的通道衰減。
對於正交分頻多工的通訊系統而言，同步化是非常重要的，影響傳輸效能甚大。本篇論文提出了一個數位電視廣播內部接收機（DVB-T inner receiver）的基頻架構。我們將會討論基頻訊號處理單元演算法，其中包括符元偵測、時間與頻率同步以及通道估測與等化。首先，我們透過電腦模擬建立整體系統流程並針對演算法做出分析與效能評估。最後利用即時軟體的概念以及Scale-Down的設計流程，使用德州儀器之數位訊號處理器(TMS320C5510,DSP)配合C++及Assembly語言實現OFDM調變/解調器及同步接收端演算法，達到能夠實際(Real time)發射DVB-T規格之訊號並驗證接收機演算法之正確性。

To offer high-bit-rate high performance, bandwidth-efficient multimedia services and combat the inevitable frequency-selective fading, the European standard for terrestrial digital video broadcasting (DVB-T) has adopted the orthogonal frequency-division multiplexing (OFDM) technique for broadcasting over wideband wireless channels.
The synchronization of symbol timing and sampling clock is very important for the OFDM communication system. This thesis presents a baseband architecture for various corresponding signal processing unit for DVB-T inner receiver. These algorithms serve the functionalities of symbol detection, timing and frequency synchronization and channel estimation/equalization. First, the flow path of overall system is built in computer simulation. Finally, we design the real-time software defined radio implementation of OFDM system and inner receiver, by use of TI C5510 DSP with C++ and assembly language. It could be reaches to transmit DVB-T signal in real time and prove the accuracy of algorithm in receiver.

參 考 文 獻
[1] ESTI, “Digital Video Broadcasting (DVB); Framing Structure, Channel Coding and Modulation for Digital Terrestrial Television”, European Telecommunication Standard EN300744 v1.4.1, 2001
[2] M. Speth, S. Fechtel, G. Fock and H. Meyr, “Optimum Receiver Design for Wireless Broad-Band Systems Using OFDM - Part I,” IEEE Trans. Commun., vol. 47, No. 11, Nov. 1999.
[3] M. Speth, S. Fechtel, G. Fock and H. Meyr, “Optimum Receiver Design for OFDM-Based Broadband Transmission-Part II: A Case Study,” IEEE Trans. Commun., vol. 49, No. 4, Apr. 2001
[4] B. Yang, K. Letaief, R. Cheng and Z. Cao, “Timing Recovery for OFDM Transmission,” IEEE Journal on Select. Commun., vol. 18, No. 11, Nov. 2000
[5] Shou-Yin Liu; Jong-Wha Chong, “A study of joint tracking algorithms of carrier frequency offset and sampling clock offset for OFDM-based WLANs”, IEEE International Conf. Communications, Circuits and Systems and West Sino Expositions, vol. 1, July. 2002.
[6] Pollet, T.; Spruyt, P.; Moeneclaey, M., “The BER performance of OFDM systems using non-synchronized sampling”, ''Communications: The Global Bridge''., IEEE 28 Nov.-2 Dec. 1994 Page(s):253 - 257 vol.1
[7] Shiou-Hong Chen; Way-Hong He; Hou-Shin Chen; Yumin Lee, “Mode Detection, Synchronization, and Channel Estimation for DVB-T OFDM”, Gobal Telecommunications Conference, 2003.
[8] D. Landstorm, S. Wilson, J. Beek, P. Odling and P. Borjesson, “Symbol Time Offset Estimation in Coherent OFDM Systems,” IEEE Trans. Commun., vol. 50, No. 4, Apr. 2002.
[9] D. Lee and K. Cheun, “Coarse Symbol Synchronization Algorithms for OFDM Systems in Multipath Channels,” IEEE Commun. Letters, vol. 6, No. 10, Oct. 2002.
[10] Coleri, S.; Ergen, M.; Puri, A.; Bahai, A.; Broadcasting, “Channel estimation techniques based on pilot arrangement in OFDM systems” IEEE Transactions on, Volume: 48 , Issue: 3 , Sept. 2002
[11] TMS320VC5510 Fixed-Point Digital Signal Processor (TI Literature Number: SPRS076J)
[12] TMS320C55x DSP CPU Reference Supplement (TI Literature Number: SPRU371F)
[13] TMS320 DSP/BIOS User''s Guide (TI Literature Number: SPRU423)
[14] TMS320C55x DSP Peripherals Reference Guide (TI Literature Number: SPRU317)
[15] TMS320C55x Chip Support Library API Reference Guide (TI Literature Number: SPRU433J)
[16] TMS320C55x Algebraic Instruction Set Reference Guide (TI Literature Number: SPRU375E)
[17] “Timing Synchronization for DVB-T System”, Meng-Lin Ku，Master thesis, NCTU, Hsinchu, ROC, 2004
[18] “Design and Software Defined Radio Implementation of Orthogonal Frequency Division Multiplexing System using PC soundcard and TI C6x DSP”, Master thesis, Yuan-Ze University, Chungli, ROC, 2003