Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/7807
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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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。
我們在此引進了CAZAC序列與Gold序列,以其良好的週期自我關聯性、交互關聯性,來取代802.11n的短訓練序列,幫助我們做封包的偵測與頻率偏差估測。
系統規格模組建立後,接著探討的是接收端同步的問題,比較了延遲關聯演算法norm-1與norm-2的優劣,並使用不同的短訓練序列,取代規格中的短訓練序列,實驗結果顯示出新引進的序列能達到不錯的效果,改良後的延遲關聯演算法norm-1也能達到與norm-2相近的結果。
最後,我們針對改良後的持續長度判定延遲關聯演算法norm-1實現硬體。

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.
URI: http://hdl.handle.net/11455/7807
其他識別: U0005-3007200721170600
Appears in Collections:電機工程學系所

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