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Research on synchronization for a MIMO-OFDM system based on 802.11n
|關鍵字:||synchronization;同步;MIMO;OFDM;802.11n;多輸入多輸出;正交分頻多工||出版社:||電機工程學系所||引用:|| T. Pollet, m. VAN Bladel and M. Moeneclaey¨orjesson ,“ BER Sensitivity of OFDM System to Carrier Frequency Offset and Wiener Phase Noise,” Communications, IEEE Transactions, vol. 43, no. 2/3/4 pp. 191-193, April, 1995.  V.S. Abhayawardhana, I.J. Wassell “Residual frequency offset correction for coherently modulated OFDM systems in wireless communication,“ Vehicular Technology, IEEE Transactions, vol. 2, pp. 777-781. May, 2002.  J. Heiskala and J. Terry, OFDM Wireless LANs: A Theoretical and Practical Guide, Sams, USA, 2001.  J. J. van de Beek, O. Edfors, M. Sandell, S. k. Wilson, and P. O.B¨orjesson, “ On channel estimation in OFDM systems,” Vehicular Technology, IEEE Transactions, 95, vol. 2, pp. 815-819, July, 1995.  K. Fazel, S. Kaiser, “Multi-carrier and spread spectrum systems,” John Wiley & Sons, 2003  Richard van Nee, Ramjee Prasad, “OFDM for wireless multimedia communications, Artech House, 2000  Mohinder Jankiraman, “Space-time codes and MIMO systems,” Artech House, 2004  P.W. Wolniansky, G.J. Foschini, G.D. Golden and R.A. Valenzuela, “V-BLAST：an architecture for realizing very high data rates over the rich- scattering wireless channel,” in ISSSE 98, 1998, pp.295-300  Siavash M. Alamouti, “A simple transmit diversity technique for wireless communications,” JSAC, pp. 1451-1458, 1998  K. Lee and D. Williams, “ A space-frequency transmitter diversity technique for OFDM systems,” in Proc. IEEE GLOBECOM, vol. 3, 2000, pp. 1473-1477.  Y. Gong and K. B. Letaief, “Space-frequency-time coded OFDM for broadband wireless communications,” in Proc. IEEE GLOBECOM, San Antonio, TX, Nov. 2001, pp. 519-523.  Simon R. 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Pupolin, “M-QAM-OFDM system performance in the presence of a nonlinear amplifier and phase noise,” IEEE Trans. Commun., vol.50, pp. 462-472, March 2002  L. Schumacher “Matlab program,” contact Laurent Schmacher at http://www.info.fundp.ac.be/~lsc/Research/IEEE_80211_HTSG_CMSC/distribution_terms.html  Chi-Yeh Yu, “MIMO-OFDM baseband transceiver design for high throughput wireless LAN,” 碩士論文, 台大電子所, July 2004  EWC HT PHY Specification, Enhanced Wireless Consortium publication, V1.27, 2005  IEEE Std. 802.11a, “Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) specifications: High-speed Physical Layer in the 5GHz Band” , 1999  Li Li; Ping Zhou, ” Synchronization for B3G MIMO OFDM in DL Initial Acquisition by CAZAC Sequence,” Communications, Circuits and Systems Proceedings, 2006 International Conference on Volume 2, June 2006 Page(s):1035 – 1039  John G. Proakis, Masoud Salehi, Gerhard Bauch,”Contemporary communication systems using MATLAB and simulink, 2/e,” 2004, THOMSON, ISBN 0-534-40617-3  IEEE 802.11-04/0923r0, “ETRI proposal specification for IEEE 802.11 TGn”  Alexander Dias, “Multiple Antenna OFDM solutions for enhanced PHY,” IEEE 802.11-04/229r1  X. B.Wang, Y.Wu, and B. Caron, “Transmitter identification using embedded pseudo random sequences,” IEEE Trans. on Broadcasting, vol. 50, no. 3, pp. 244–252, Sept. 2004.  Hao Xuefei; Chen Jie, “A hardware architecture of MIMO-OFDM synchronizer,” ASIC, 2005. ASICON 2005. 6th International Conference On Volume 1, 24-27 Oct. 2005 Page(s):189 – 192  Hao Xuefei; Chen Jie, “Implementation frame synchronization for MIMO-OFDM system with ZCZ-codes,” Microwave, Antenna, Propagation and EMC Technologies for Wireless Communications, 2005. MAPE 2005. IEEE International Symposium on Volume 1, 8-12 Aug. 2005 Page(s):241 - 244 Vol. 1  Xiaoxu Guo; Jie Chen; Yulin Qui; Naoki Suehiro, “A new architecture of matched-filter bank for high-speed code acquisition of ZCZ-CDMA system,” Parallel and Distributed Computing, Applications and Technologies, 2003. PDCAT''2003. Proceedings of the Fourth International Conference on 27-29 Aug. 2003 Page(s):391 – 395  A. Rathinakumar and A.K. Chaturvedi, “Mutually orthogonal sets of ZCZ sequences,” electronics letters 2nd September 2004 Vol. 40 No. 18  Li Li; Ping Zhou, ” Synchronization for B3G MIMO OFDM in DL Initial Acquisition by CAZAC Sequence,” Communications, Circuits and Systems Proceedings, 2006 International Conference on Volume 2, June 2006 Page(s):1035 – 1039  Meng Wu; Wei-Ping Zhu, “A preamble-aided symbol and frequency synchronization scheme for OFDM systems,” Circuits and Systems, 2005. ISCAS 2005. IEEE International Symposium on 23-26 May 2005 Page(s):2627 - 2630 Vol. 3  T. M. Schmidl and D. C. Cox, “Robust frequency and timing synchronization for OFDM,” IEEE Trans. on Commun., vol. 45, no. 12, pp. 1613–1621, Dec. 1997.  Wu Yuan; Shi Zhiguo; Chen Kangsheng, “Robust Time Synchronization Scheme Combating Frequency Offset for IEEE 802.16a OFDM Systems,” Communications, Circuits and Systems Proceedings, 2006 International Conference on Volume 2, June 2006 Page(s):1068 – 1072  J. J. Van de Beek, M. Sandelland, and P. O. Börjesson, “ML estimation of time and frequency offset in OFDM systems,” IEEE Trans. on Signal Processing, vol. 45, no. 7, pp. 1800–1805, July 1997.  D. Landström, S. K. Wilson, J. J. Van de Beek, P. Odling, and P. O. Börjesson, “Symbol time offset estimation in coherent OFDM systems,” in Proc. Int. Conf. On Communications, vol. 1, Vancouver, BC, Canada, June 1999, pp. 500–505.  Huarong Zheng; Jue Tang; Bo Shen,” Low-complexity joint synchronization of symbol timing and carrier frequency for OFDM systems,” Consumer Electronics, IEEE Transactions on Volume 51, Issue 3, Aug. 2005 Page(s):783 – 789  M. H. Hsieh and C. H. Wei, “A low-complexity frame synchronization and frequency offset compensation scheme for OFDM systems over fading channels,” IEEE Trans. Vehicular. Technology, vol.48, No.5, Sep. 1999, pp. 1596-1609.  Yusuke ASAI, Satoshi KUROSAKI, Takatoshi SUGIYAMA and Masahiro UMEHIRA, “Precise AFC scheme for performance improvement of SDM-COFDM,” IEEE 2002  Jimenez, V.P.G.; Garcia, M.J.F.-G.; Serrano, F.J.G.; Armada, A.G., “Design and implementation of synchronization and AGC for OFDM-based WLAN receivers,” Consumer Electronics, IEEE Transactions on Volume 50, Issue 4, Nov. 2004 Page(s):1016 – 1025  Chi-Yeh Yu; Zih-Yin Ding; Tzi-Dar Chiueh, “Design and simulation of a MIMO OFDM baseband transceiver for high throughput wireless LAN,” Circuits and Systems, 2004. Proceedings. The 2004 IEEE Asia-Pacific Conference on Volume 1, 6-9 Dec. 2004 Page(s):205 - 208 vol.1  Zih-Yin Ding; Chi-Yun Chen; Tzi-Dar Chiueh, “Design of a MIMO-OFDM baseband receiver for next-generation wireless LAN” Circuits and Systems, 2006. ISCAS 2006. Proceedings. 2006 IEEE International Symposium on 21-24 May 2006 Page(s):4 pp.  Tsung-Hsueh Lee; Jing-Siang Jhuang; Tzi-Dar Chiueh, “A High-Speed Baseband Receiver for MIMO OFDM Based WLAN,” VLSI Design, Automation and Test, 2006 International Symposium on April 2006 Page(s):1 – 4  Juha Heiskala; John Terry, “OFDM Wireless LANs：A Theoretical and Practical Guide,” Sams, 2001||摘要:||
EWC訂定HT PHY Specification，目的是協助IEEE 802.11TGn無線區域網路規格的發展，其中定義了三種不同的PLCP封包格式：Legacy mode、Mixed mode、Green field，及五種操作模式：LM、HT-Mode、Duplicate Legacy Mode、40MHz Upper Mode、40MHz Lower Mode，其中，LM及HT-mode是規格中必備的選項，因此本論文以建立可支援Legacy mode與Green field封包格式，以及操作在20MHz與40MHz頻寬的LM、HT-mode下的模擬模組為目標。
EWC(enhanced wireless consortium) established HT PHY specification, and its purpose was to help the development of IEEE 802.11TGn. This specification defines three kinds of PLCP packet format: Legacy mode, Mixed mode and Green field, and five kinds of operation mode: LM, HT-Mode, Duplicate Legacy Mode, 40MHz Upper Mode and 40MHz Lower Mode. The LM and HT-mode are mandatory in the specification, so that the purpose here is to establish a packet format that supports Legacy mode and Green field, and establish a simulation module that can operating at 20MHz and 40MHz bandwidth.
We use the CAZAC sequence and Gold sequence to replace the short training sequence because of its perfect performance of periodic auto-correlation and cross-correlation. The sequences help us to detect frame and estimate frequency offset.
When the system module is established, we focus on the synchronization of receiver. We compare the delay-correlation algorithms, norm-1 and norm-2, and use different short training sequences to substitute for the standard's short training sequence. The simulation results show that the new sequences have good performance, and the performance of refined delay-correlation algorithm norm-1 can approximate to norm-2.
Finally, we implement the hardware of the delay-correlation algorithm norm-1 with delay decision method.
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