1 all for x x p x f 1 all for v 1 x x x c p v 1 x p 3 4 10 9 LDPC Codes EXIT

1 all for x x p x f 1 all for v 1 x x x c p v 1 x p 3

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) 1 , 0 ( all for , ) , ( < x x p x f ) 1 , 0 ( all for ), ( v ) ( 1 < x x x c p ) ( v 1 x p
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3/ 4/ 10 9 LDPC Codes EXIT Chart Example Example: (3,4)-regular LDPC code, p* =0.6474 2 1 1 3 2 ) ( ) 1 ( 1 ) 1 ( 1 ) ( ) ( ) ( = = = = = p x x v x px x x c x p x v p p ρ λ 3 2 ) ( ) ( x x x x = = ρ λ
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3/ 4/ 10 10 LDPC Codes EXIT Chart Example Example: (3,4)-regular LDPC code, p* =0.6474 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 p =0.5 p =0.6 p =0.7 p =0.8 p * 0.6474 3 ) 1 ( 1 ) ( x x c = 2 1 1 ) ( = p x x v p for various values of initial erasure probability p
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