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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Rician fading ： ウィキペディア英語版 Rician fading Rician fading is a stochastic model for radio propagation anomaly caused by partial cancellation of a radio signal by itself — the signal arrives at the receiver by several different paths (hence exhibiting multipath interference), and at least one of the paths is changing (lengthening or shortening). Rician fading occurs when one of the paths, typically a line of sight signal, is much stronger than the others. In Rician fading, the amplitude gain is characterized by a Rician distribution. Rayleigh fading is the specialised model for stochastic fading when there is no line of sight signal, and is sometimes considered as a special case of the more generalised concept of Rician fading. In Rayleigh fading, the amplitude gain is characterized by a Rayleigh distribution. == Channel characterization == A Rician fading channel can be described by two parameters: $K$ and $\backslash Omega$.〔Abdi, A. and Tepedelenlioglu, C. and Kaveh, M. and Giannakis, G., ("On the estimation of the K parameter for the Rice fading distribution )", ''IEEE Communications Letters'', March 2001, p. 92 -94〕 $K$ is the ratio between the power in the direct path and the power in the other, scattered, paths.〔"Statistical properties of a sine wave plus random noise" SO Rice - ''Bell Syst. Tech. J'', 1948〕 $\backslash Omega$ is the total power from both paths ($\backslash Omega=\backslash nu^2+2\backslash sigma^2$), and acts as a scaling factor to the distribution. The received signal amplitude (''not'' the received signal power) $R$ is then Rice distributed with parameters $\backslash nu^2\; =\; \backslash frac\backslash Omega$ and $\backslash sigma^2\; =\; \backslash frac$.〔Richards, M.A., (Rice Distribution for RCS ), Georgia Institute of Technology (Sep 2006)〕 The resulting PDF then is: :$$ f(x) = \frac \exp\left(-K-\frac\right) I_0\left(2\sqrt}x\right) , where $I\_0(\backslash cdot)$ is the 0th order modified Bessel function of the first kind. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Rician fading」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.