LDPC Decoding: VLSI Architectures and Implementations
LDPC Decoding: VLSI Architectures and Implementations
LDPC Decoding: VLSI Architectures and Implementations
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<strong>LDPC</strong> <strong>Decoding</strong>, Quick Recap 2/5<br />
• There are four types of LLR messages<br />
• Message from the channel to the n-th bit node,<br />
( i )<br />
Q − ><br />
( )<br />
• Message from n-th bit node to the m-th check node n m or simply<br />
L n<br />
( i )<br />
Q nm<br />
i<br />
R − ><br />
• Message from the m-th check node to the n-th bit node m n or simply<br />
• Overall reliability information for n-th bit-node<br />
m = 0<br />
m = 1<br />
m = 2<br />
P n<br />
( i )<br />
R m n<br />
(i)<br />
R0 −>3<br />
R<br />
(i)<br />
2 −>3<br />
( i)<br />
Q<br />
3 > 1<br />
−<br />
6<br />
n = 0 n = 1 n = 2 n = 3 n = 4 n = 5 n = 6<br />
P<br />
L 3<br />
Channel Detector<br />
4
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