C-max I(X; Y)=max H(X)-H(X/Y) P(Xi) P(X -max[ H(Y-HY/X) P(Xi) max I(,Y) t P(X) 信道最大信息传输速率定义：信道容量C C＝max I(X；Y）＝max [ H(X)-H(X/Y)] =max [ H(Y)-H(Y/X)] P(Xi ) P(Xi ) P(Xi ) max ( ; ) 1 I X Y t Ct = P(Xi ) 信道最大信息传输速率