自適性通道估測在移動式WiMAX系統下鏈傳輸之效能分析

Performance Analysis of Adaptive Channel Estimation for Mobile WiMAX Downlink Transmission

巫芮楷(Reui-Kai Wu)

指導教授 ： 劉玉蓀

國立臺北科技大學/電資學院/電腦與通訊研究所/碩士(2011年)

https://doi.org/10.6841/NTUT.2011.00089

摘要

在行動通訊中，訊號會受到多路徑干擾與雜訊的影響使得振幅與相位產生變化，因此為了接收到正確資料，需透過通道估測來對訊號進行補償。基於上述理由，我們提出時域平均法、固定權重平均法及自適性通道估測法，並與WiMAX常用的二階線性內插法做比較。本論文以IEEE 802.16e-2005規格做為實驗平台，並使用國際電信聯盟無線電通信組(ITU-R)訂定的通道環境來模擬移動式WiMAX系統下鏈傳輸。模擬結果顯示時域平均法的效能隨車速上升而降低，固定權重平均法的效能並不是永遠都比二階線性內插法或時域平均法好，自適性通道估測法無論在任何通道中皆為效能最佳的通道估測法。

關鍵字

通道估測 ； WiMAX ； 時域平均法 ； 固定權重平均法 ； 自適性通道估測

並列摘要

In mobile communications, the signal amplitude and phase changed by multi-path interference and noise impact, so in order to receive the correct information need to compensate data through channel estimation. We propose time-average method, static weighted-average method and adaptive channel estimation method, and comparison with WiMAX popular two-dimensional linear interpolation. This thesis use standard IEEE 802.16e-2005 to make platform for simulation, and use channel model with established by ITU-R to simulate the mobile WiMAX downlink transmission platform. Simulation results show the performance of time-averaging method decreases to follow increased speed, the performance of static weighted-average method is not always better than two-dimensional linear interpolation method or time-averaging method, when the two are close to the performance, the performance will be superior to both; but the gap in performance between the two large, the performance can only between the both, adaptive channel estimation method is the best estimation method for all channel models considered.

並列關鍵字

Channel estimation ； WiMAX ； Time-Average method ； static weighted-average method ； Adaptive Channel Estimation

參考文獻

[3] 何孟衡，移動式WiMAX系統中遞迴式通道估測與軟式解碼之效能，碩士論文，國立臺北科技大學電腦與通訊研究所，台北，2010。

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[5] Recommendation ITU-R M.1225, “Guidelines for evaluation of radio transmission technologies for IMT-2000,” International Telecommunication Union, 1997.