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題 名 | 高速鐵路分散式天線系統之時序飄移改善方法=A Method of Improving the Timing Shifting in High Speed Railway Distributed Antenna System |
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作 者 | 侯信安; 王鴻翔; 陳志成; | 書刊名 | 電腦與通訊 |
卷 期 | 155 2014.02[民103.02] |
頁 次 | 頁93-100 |
專 輯 | 下世代無線接取系統傳輸技術專題 |
分類號 | 448.813 |
關鍵詞 | 分散式天線系統; 迴響通道效應; 時序飄移; Distributed antenna system; DAS; Echo channel effect; Timing drift; |
語 文 | 中文(Chinese) |
中文摘要 | 在最近幾年高速鐵路以分散式天線系統 (DAS)提供無線寬頻服務已經引起了人們的關注。在本文中,我們分析分時雙工之分散式天線系統 (TDD-DAS)問題,包括遠端天線單元(RAU)信號覆蓋範圍和迴聲通道 (echo channel)效應,雖然使用移動天線技術可解決在 TDD-DAS的迴聲問題,但會造成時序漂移 (timing drift),損害系統效能。為了克服這個問題,我們提出了天線選擇及時間補償的控制技術,模擬結果顯示,時間補償天線的控制技術能有效地解決迴聲通道問題與改善時序飄移。 |
英文摘要 | Providing broadband wireless services over high-speed railways with Distributed Antenna Systems (DAS) has attracted much attention in recent years. In this paper, we analyze two issues in Time Division Duplex (TDD)-DAS, including coverage of Remote Antenna Units (RAUs) and echo channel effect. Moving cell technique can mitigate the effects of echo on the channel, but at the same time, introduce timing drift, which will degrade the system performance. To overcome these problems, we propose techniques for antenna selection with timing compensation. Simulation results show that the echo channel issue can be solved effectively. |
本系統中英文摘要資訊取自各篇刊載內容。