●●● ●●●●● ●●●● 离散无记忆模K加性噪声信道 ●●● ●●●● ●●0● Z=x=Y={0,1,K-1} x+z mod K H(Y X)=22(xp(ylx)log p(ylx) =∑Q(x)p(z)bogp(z) H(Z) C=log K-H(Z)离散无记忆模K加性噪声信道 ⚫ Z=X=Y={0,1,…,K-1} ⚫ y=x+z mod K log ( ) ( ) ( ) ( )log ( ) ( | ) ( ) ( | )log ( | ) , , C K H Z H Z Q x p z p z H Y X Q x p y x p y x x z x y = − = = =  