●●● ●●●● ●●●●心 ●●●● 1.Characterization by Power Loss Ratio ●●●● ●●●● ●●●● ●● Power Loss ratio:P 1-r(o IL(dB)=101g PLR Because of the causal properties of networks由于网s络的 因果关系，T(o)2 is an even function偶函数ofo(see Problem 5.1), Therefore,writing|T(o)l2 as a polynomial多项式ino2 of-i两 M(o2) M(O) PR=1+ N(o2） 61. Characterization by Power Loss Ratio Power Loss ratio: Because of the causal properties of networks由于网络的 因果关系,  2 is an even function偶函数of  (see Problem 5.1), Therefore, writing  2 as a polynomial多项式 in  2 6   2 1 1 in LR Load P P P        10lg L R IL dB P        2 2 2 2 M M N            2 2 1 LR M P N    