時變向量無線電通道脈衝響應模擬器之研究

Abstract

本研究利用向量通道脈衝響應量測系統（RUSK Channel Sounder）獲取大、中及小型都會區以及郊區的時變向量無線電通道脈衝響應之實測數據，藉由統計方法分析量測數據探討各種傳播環境的通道參數特性，這些通道參數包含群集因子、接收路徑平均抵達率、時變參數、空間參數及接收路徑的振幅大小與相位。分析這些通道參數後便進一步建構通道參數模型，最後藉由Turin’s D-K通道脈衝響應模型、Hashemi’s時變通道脈衝響應模型並且加入通道空間（向量）效應，配合COST 259通道模型建構時變向量無線電通道脈衝響應模擬器。藉由統計實測數據與模擬器輸出的時變向量無線電通道脈衝響應之均方根延遲時間擴散參數（r.m.s delay spread），發現統計結果相近，驗證該通道模擬器為一適應性良好的時變向量無線電通道脈衝響應模擬器。

In this paper, an advanced vector channel sounder as employed to perform the time-varying vector radio channel impulse response measurement in urban and suburban environments. By analyzing measurement data, characteristics of radio channel parameters are studied, which includes the cluster factor, the mean arrival rate of multipath, the time-varying parameter, the spatial parameter and a series of amplitudes, phase shifted replicas of the transmitted signal. Then a time-varying vector radio channel impulse response simulator based on Turin’s D-K model is proposed, where concepts of Hashemi’s time-varying channel impulse response model and COST 259 channel model are applied. This simulator is validated by comparing the computed r.m.s. delay spread with the measured one and has been proven that which can accurately model the time-varying channel impulse response.