+s + Se +s7 Figure 4.8.3 Tanner graph of a(7,3)linear block code LDPC be repre resented by normal graphs,see Fig.4.8.3-2.Figure 4.8.4 depicts a generic normal graph for an LDPC code Xo X + = Figure4.8.3-25 c1 c2 c3 c4 c5 c6 c7 s1 s2 s3 s4 s5 s6 s7 Figure 4.8.3 Tanner graph of a (7, 3) linear block code LDPC codes can also be represented by normal graphs, see Fig. 4.8.3-2. Figure 4.8.4 depicts a generic normal graph for an LDPC code. Figure 4.8.3-2