probability The uniform interleaver makes independent weight distributions of the parity check sequences generated by the first and second encoders. With this definition,we can easily obtain the conditional WEF of the overall PCBC by AR(2=4(Z49(☑ (4.57 For a parallel concatenated code Ce consisting of M constituent codes and M-I uniform interleavers of length K,its conditional WEF is related to the conditional WEF of its constituent codes by 4(2 4(Z) (4.58) (w As an example,Fig.4.21 shows the distance spectrum ofa turbo code of rate 1/3 Fig.4.21.The distance spectrum of a turbo code of rate 1/3.Info length K=400,N=1200, memory=5. Remark:Unlike random binary block codes that have a binomial distance spectrum and are known to achieve capacity,based on the exponentia deviation of the distance spectrumof 4424-42 probability 1 K w       . The uniform interleaver makes independent weight distributions of the parity check sequences generated by the first and second encoders. With this definition, we can easily obtain the conditional WEF of the overall PCBC by           w K A Z A Z A Z C w C C w w P ( ) ( ) ( ) 1 2 (4.57) For a parallel concatenated code p consisting of M constituent codes and M-1 uniform interleavers of length K, its conditional WEF is related to the conditional WEF of its constituent codes by 1 1 ( ) ( ) m P M C w C m w M A Z A Z K w           (4.58) As an example, Fig. 4.21 shows the distance spectrum of a turbo code of rate 1/3. Fig. 4.21. The distance spectrum of a turbo code of rate 1/3. Info length K=400, N=1200, memory=5. Remark: Unlike random binary block codes that have a binomial distance spectrum and are known to achieve capacity, based on the exponential deviation of the distance spectrum of