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標題: 基於802.11n的多輸入多輸出正交分頻多工系統之同步研究
Research on synchronization for a MIMO-OFDM system based on 802.11n
作者: 王弘綸
Wang, Hung-Lun
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
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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 [21] L. Schumacher “Matlab program,” contact Laurent Schmacher at [22] Chi-Yeh Yu, “MIMO-OFDM baseband transceiver design for high throughput wireless LAN,” 碩士論文, 台大電子所, July 2004 [23] EWC HT PHY Specification, Enhanced Wireless Consortium publication, V1.27, 2005 [24] IEEE Std. 802.11a, “Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) specifications: High-speed Physical Layer in the 5GHz Band” , 1999 [25] 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 [26] John G. 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[42] Yusuke ASAI, Satoshi KUROSAKI, Takatoshi SUGIYAMA and Masahiro UMEHIRA, “Precise AFC scheme for performance improvement of SDM-COFDM,” IEEE 2002 [43] 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 [44] 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 [45] 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. 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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.
其他識別: U0005-3007200721170600
Appears in Collections:電機工程學系所

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