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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 Coherence time (communications systems) ： ウィキペディア英語版 Coherence time (communications systems) In communications systems, a communication channel may change with time. Coherence time is the time duration over which the channel impulse response is considered to be not varying. Such channel variation is much more significant in wireless communications systems, due to Doppler effects. ==Simple model== In a simple model, a signal $x(t)$ transmitted at time $t\_1$ will be received as :$y\_(t)\; =\; x(t-t\_1)$ *h_(t), where $h\_(t)$ is the channel impulse response (CIR) at time $t\_1$. A signal transmitted at time $t\_2$ will be received as :$y\_(t)\; =\; x(t-t\_2)$ *h_(t). Now, if $h\_(t)\; -\; h\_(t)$ is relatively small, the channel may be considered constant within the interval $t\_1$ to $t\_2$. Coherence time ($T\_c$) will therefore be given by :$T\_c\; =\; t\_2\; -\; t\_1.$ 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「Coherence time (communications systems)」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.