標題: 室內超寬頻無線電通道頻寬效應之研究
Effect of Bandwidth on Indoor UWB Radio Channels
作者: 沈鳴君
Ming-Jiun Shen
唐震寰
Jenn-Hwan Tarng
電信工程研究所
關鍵字: 超寬頻;頻寬效應;UWB;bandwidth
公開日期: 2003
摘要: 本論文主要是研究室內環境超寬頻無線電傅播之頻寬效應,在此論文中,吾人是以隨機節拍-延遲-線模型,描述室內超寬頻通道的特性,在此模型是以兩種參數:功率比值r以及衰減常數ε來描述平均功率延遲曲線圖,而這些參數可經由在大樓內進行大量的量測之後計算得到,而所量測頻段為3 GHz至5 GHz。由計算結果發現以下之現象:(1)衰減常數僅稍微與訊號頻寬有關;(2)功率比值會隨著頻寬增加而變小;(3)衰減常數會隨著區域散射體愈靠近接收端而變小;(4)功率比值會隨著區域散射體愈靠近接收端而變大;(5)在視線內環境,Rician 因子會隨著頻寬增加而變小;(6)在非視線內環境,Rician 因子會隨著頻寬增加而變大。
Effects of bandwidth on Ultra-Wideband (UWB) radio propagation in indoor environments are investigated. To characterize the indoor UWB channels, the stochastic tapped-delay-line (STDL) model is employed. With the STDL model, the power delay profile (PDP) can be described by using power ratio r and decay constantεas described. Those parameters can be calculated with a large number of measurement data carried out at an education building. The measured frequencies are ranged from 3 GHz to 5GHz. It is found that (1) The decay constant of the PDP is only slightly dependent on the signal bandwidth; (2) The power ratio of the PDP is decreased when the signal bandwidth is increased; (3) The decay constant is decreased as the local scatterers move closer to receiver; (4) The power ratio is increased as the local scatterers move closer to receiver; (5) The Rician factor is decreased when radio bandwidth is increased of LOS condition; (6) The Rician factor is increased when radio bandwidth is increased of NLOS condition.
URI: http://140.113.39.130/cdrfb3/record/nctu/#GT009113590
http://hdl.handle.net/11536/46767
Appears in Collections:Thesis


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