1 p x p y x p x y p y p x p

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Unformatted text preview: 所以C 仅与 仅与 p(y|x)有关,而与p(x)无关 p(y|x)有关,而与p(x)无关 3)C是信道传输最大信息速率能力的度量 多维矢量信道 多维矢量信道 ★若 X 和 Y 分别为信道的N维输入与输出随机 矢量集合,则信道容量定义为: N N C max I ( X N ; Y N ) p ( x1 x N ) 其中, p ( x1 x N ) 为信道输入矢量的联合概率 2 单符号离散信道及其容量 单符号离散信道及其容量 ★ ★ ★ 离散无噪信道的容量 离散对称信道的容量 一般离散信道的容量 2.1 离散无噪信道的容量 离散无噪信道的容量 ★ 无损信道:输出符号只对应一个输入符号。 C max H ( X ) log r (比特/符号) 其中r为输入符号集的大小 2.1 离散无噪信道的容量 离散无噪信道的容量 ★ 确定信道: 每个输出符号都对应一个输出符号 C maxH (Y ) logs (比特 符号 / ) 其中s为输入符号集的大小 2.1 离散无噪信道的容量 离散无噪信道的容量 ★ 无损确定信道: 输入符号与输出符号是一...
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