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題 名 | 正交分頻多工系統在高速移動環境下之通道估測技術=Channel Estimation Schemes for OFDM Systems in High Mobility Environment |
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作 者 | 許崇仁; 黃傳原; 劉家維; | 書刊名 | 電腦與通訊 |
卷 期 | 142 2011.12[民100.12] |
頁 次 | 頁150-157 |
專 輯 | 寬頻網路與車載資通訊技術服務專輯 |
分類號 | 448.6 |
關鍵詞 | 正交分頻多工; 高速鐵路列車; 直視; 線性組合; Orthogonal frequency division multiplexing; OFDM; High speed train; HST; Line-of-sight; LOS; Linear combination; |
語 文 | 中文(Chinese) |
中文摘要 | 高速移動是未來4G無線通訊系統的特點之一,正交分頻多工(Orthogonal Frequency DivisionMultiplexing)傳輸技術為其可能的技術,其應用主要是在高速鐵路列車上進行寬頻無線通訊傳輸。然而,在高速移動下,通道變動快速,不容易估測通道響應。本文利用高鐵通道具直視波路徑,其同調頻寬較大的特性,在頻域上針對已知之領航次載波做滑動加權視窗處理及內插,以估計通道平均響應;接著再利用通道高階時變模型的特性,將前後數次估測的通道平均響應經過特定線性組合處理,以估計通道變化響應。通道的同調頻寬越大,則滑動加權視窗可以越大,通道響應之估計也越準確且計算複雜度低。 |
英文摘要 | High-mobility is important for the 4G wireless communications. Orthogonal Frequency Division Multiplexing (OFDM) technique may be adopted and broadband wireless transmission in the high speed train (HST) is the main application. However, channel estimation is not easy in high-mobility environments. Based on the Line-of-Sight of the HST channel, the pilot carriers can be used to estimate the channel average response (CAR) through the sliding windowing and interpolation. Furthermore, the channel variation response can be estimated by the linear combination of the CAR. The larger the coherent bandwidth is, the larger the sliding window size will be, and hence the system performance can be improved and the computation complexity can be reduced. |
本系統中英文摘要資訊取自各篇刊載內容。