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題 名 | Disussion of Spatial and Spectral Power Fading for Wireless Communication Channels=無線通訊通道空間域功率衰落及頻率域功率衰落特性的探討 |
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作 者 | 李學智; 藍榮源; 謝志偉; | 書刊名 | Proceedings of the National Science Council : Part A, Physical Science and Engineering |
卷 期 | 22:2 1998.03[民87.03] |
頁 次 | 頁272-278 |
分類號 | 448.82 |
關鍵詞 | 無線通訊通道; 空間域功率; 頻率域功率; Channel characteristics; Wireless communication; |
語 文 | 英文(English) |
中文摘要 | 本文探討無線通訊通道空間域功率衰落及頻率域功率衰落之特性。結果顯示, 對於小範圍,空間域功率分佈與頻率域功率分佈有很大的相關性。本文提出了一種校 正方法,可以從功率延遲剖面的量測直接獲取頻率域平均功率的方法。本文亦探討了 信號頻寬及所選取空間範圍大小對於所求出之平均功率的影響。模擬及實驗結果頻示 ,大部份的情況空間域平均功率可以用頻率域平均功率來取代。其主要意義是:欲獲 得空間域干均功率,使用此種替代方式將可以節省根多量測時間或數值模擬時間。 |
英文摘要 | In this paper, spatial and spectral power fading distributions for wireless communication channels are discussed. It is demonstrated that a spatial power distribution over a small-scale area is highly correlated to the spectral power distribution. A calibration method to derive the spectral mean power directly from the power delay profile measurement is proposed. The effect of signal bandwidth and area size on the spectral and spatial mean power is numerically discussed. It is found that the spatial mean power can be replaced by the spectral mean power in most cases. Consequently, the measurement time or simulation time required to obtain the mean power over a small-scale area can be much reduced. |
本系統中英文摘要資訊取自各篇刊載內容。