三維雙環式移動系統間衰減通道之架構

衰退通道開始被研究至今已有40多年的時間了。相關的研究主題有多輸入-多輸出 (MIMO) 系統的空間-時間相關函數、模擬衰退通道的方法及都卜勒位移的估測…等方面。但這些主題現今都還只是停留在討論二維的基地台到手機端的傳輸環境。在都市的環境中，我們需要考慮到我們所接受到的信號是由水平方面及垂直平面的波所組合而成。因此必須要在二維的系統下額外考慮一個重要的參數『仰角角度』，如此一來三維的傳播環境情況才符合都市傳輸的環境。在最近幾年，新的運用一直被提出，例如移動式系統它是在討論傳送端跟接收端在同時間下都具有移動的能力。且此移動式系統能互相傳遞信號，而不用透過基地台來做傳送信號的動作。而這一個系統目前被運用於隨意網路及小範圍的專用通訊系統。因此在本篇論文中我們提出一個空間-時間-頻率相關函數及三維雙環式移動系統間瑞雷衰退通道模擬方法。在空間-時間-頻率相關函數中我們討論了天線場型、都卜勒位移及延遲剖面圖組合而成的效應。而模擬的方案是採用蒙地卡羅原理及都卜勒擴張的方法。在空間-時間-頻率相關函數及模擬器將會不同的天線陣列場及都卜勒位移下，討論四種不同的仰角角度機率密度函數。此外還會詳細討論模擬器相關的統計特性。

關鍵字

瑞雷衰減通道；仰角角度；天線場型；雙環式移動式通道

並列摘要

The fading channels have been investigated for about four decades. The related topics include space-time correlation function for the multiple-input-multiple-output (MIMO) communication systems, simulation schemes of fading channels, and estimation of Doppler shift etc.. Most researches always focus on the scattering environment of two-dimensional (2-D) base station to mobile station (BS-MS). However, the BS-MS model seems to lack of certain condition toward a realistic situation, the simultaneous mobility for both the transmitter and the receiver. Consequently, the 2-D mobile-to-mobile (M-M) communication system was proposed. This system can be applied into the ad hoc networking and dedicated short range communications systems. But in the urban, we need to consider the horizontal wave plane and vertical wave plane of received signals. In practice, one important parameter, elevation angle (EA), will be added into 2-D channel models to achieve the 3-D propagation environment. Then, it can describe the urban environment sufficiently. Therefore, in this thesis, we present a space-time-frequency correlation function (STF-CF) and a simulation scheme of 3-D double-ring mobile-to-mobile (M-M) Rayleigh fading channel. We have been discussed the STF-CF via the composition of antenna patterns, Doppler shift, and delay profile. The simulation scheme utilizes the Monte Carlo Principle and the method of the Doppler spread. Four types of the EA PDF, Aulin, Parsons, Qu-Yeap, and uniform model with different antenna array patterns, and Doppler shift will be discussed in the STF-CF and simulator. The related statistics of the simulator will be presented.

並列關鍵字

Rayleigh fading channel ； antenna pattern ； elevation angle ； double-ring mobile-to-mobile channel

參考文獻

[1] B. Sklar, “Rayleigh fading channels in mobile digital communication systems Part I. Characterization,” IEEE Commun. Magazine, vol. 35 pp.90-100, July, 1997.

[2] W. R. Young, “Comparison of mobile radio transmission at 150,450,900, and

[4] D. O. Reudink, “Comparsion of radio transmission at X-band frequencies in

suburban and urban areas,” IEEE Trans. on Antennas and Propagation, 1972.

[5] J. D. Parsons, “Signal strength prediction in build-up areas part 2: signal vari-ability,” IEEE Proc., vol. 130,. No. 5, pp. 377V384, Aug. 1983.

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三維雙環式移動系統間衰減通道之架構

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