| 摘要(英) |
Recently, there are three major different specifications developed for the terrestrial digital video broadcasting. The terrestrial digital video broadcasting (DVB-T) of European Standard has adopted the orthogonal frequency division multiplexing (OFDM) modulation technique, which offers high-rates, high bandwidth-efficient digital transmission, and various multimedia services over frequency-selective fading channels. However, OFDM technique is very sensitive to synchronization errors, and this deeply impacts system performance. What we concern for synchronization errors includes symbol timing, carrier frequency offset (CFO). The synchronization scheme is mainly based on the correlation of cyclic prefix and the known pilot signals.
This thesis has studied the effect of synchronization errors on OFDM systems, and presented synchronization schemes for DVB-T receivers. We use hardware description language - Verilog and MolelSim to implement the synchronization schemes and verify the design by using Matlab simulation results for the RTL model. |
| 參考文獻 |
[1] ESTI,“Digital Video Broadcasting (DVB); Framing Structure, Channel Coding and Modulation for Digital Terrestrial Television,”ETSI EN300744 v1.4.1, 2001.
[2] 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.
[3] Meng-Han Hsieh and Che-Ho Wei,“A Low-Complexity Frame Synchronization and Frequency Offset Compesation Scheme for OFDM Systems over Fading Channels ,”in IEEE Transactions on Vehicular Technology, Vol .48, No. 5, September 2000.
[4] K. Sathananthan and C. Tellambura,“Probability of Error Calculation of OFDM Systems With Frequency Offset,”IEEE Transactions on Communications, Vol. 49, No. 11, pp. 1884 - 1888, Nov. 2001
[5] 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.
[6] R. Nee and R. Prasad,“OFDM for Wireless Multimedia Communications,”Artech House, 2000.
[7] L. Hanzo, M. Munster, B.J. Choi and T. Keller,“OFDM and MC-CDMA for Broadband Multi-User Communications, WLANs and Broadcasting,”IEEE Press, 2003.
[8] B. Yang, K. Ben Letaief , R.S. Cheng, and Z. Cao,
“Timing Recovery for OFDM Transmission,”IEEE. Journal on Selected Areas in Communications, vol. 18, Issue 11, pp. 22782291, Nov. 2000.
[9] Shiou-Hong Chen, Way-Hong He, Hou-Shin Chen and Yumin Lee,“Mode Detection, Synchronization, and Channel Estimation for DVB-T OFDM,”Global Telecommunications Conference, 2003.
[10] Ray Andraka,“A survey of CORDIC algorithms for FPGA based computers,”Artech House, 2000. |
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