- 作者: 李學智; 藍榮源; 謝志偉
- 作者服務機構: 國立台灣大學電機工程學系
- 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,空問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問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:欲獲得空閒域平均功率,使用此種替代方式將可以節省很多量測時間或數值模擬時問。
- 英文摘要: In this paper, spatial and spectral power fading distributions for wireless communication channelsare discussed. It is demonstrated that a spatial power distribution over a small-scale area is highly correlatedto the spectral power distribution. A calibration method to derive the spectral mean power directly fromthe power delay profile measurement is proposed. The effect of signal bandwidth and area size on thespectral and spatial mean power is numerically discussed. It is found that the spatial mean power canbe replaced by the spectral mean power in most cases. Consequently, the measurement time or simulationtime required to obtain the mean power over a small-scale area can be much reduced
- 中文關鍵字: channel characteristics; wireless communication
- 英文關鍵字: --