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AnswerRe: Direct creation of CWnd Object Pin
Victor Nijegorodov27-Jun-17 6:17
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GeneralRe: Direct creation of CWnd Object Pin
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GeneralRe: Direct creation of CWnd Object Pin
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QuestionHow to proceed and execute LDPC decoding using Data Structure in C Pin
Member 1326117526-Jun-17 21:15
Member 1326117526-Jun-17 21:15 
Hi,
 
I know LDPC decoding logic but i don`t have knowledge in Data Structure. Please help me How to proceed LDPC Decoding Using  Data Structure in C ? Please teach me in writing coding step by step.
 
In that process i have been provided with a H matrix,code word like [c1, c2, c3, c4, c5, c6] =[1 0 1 0 1 1].
 
The received word is r=[X 0 1 X 1 1], where X = missing bits. c1 and c4 are missing bits, i need to find missing bits using tanner graph.
 
In tanner graph, there are two nodes : Check Nodes and Variable Nodes
#Variable-nodes: Correspond to bits of the codeword or equivalently, to columns of the parity check matrix.
     There are n v-nodes
#Check-nodes: Correspond to parity check equations or equivalently, to rows of the parity check matrix. Also known as constraint nodes.
      There are m = (n-k) c-nodes.
 
STEPS :
c4 bit is recovered first and then c1 bit is recovered. Total 2 iterations are used.
 
1. Messages are passed from variable nodes to check nodes. At check nodes they are processed and the results are stored
 
using the constraint c3^c4^ c6=0, we calculate the value of c4.
 
2. Update the values at variable nodes, Messages (value of c4 ) are passed from check nodes to variable nodes
 
3.Updated messages are again transferred from variable nodes to check nodes.
Using constraint: c1^c2^c3^c4=0
Value of c1 is calculated
4. Values are updated at variable nodes, Message (value of c1) is passed from check nodes to variable nodes
Finally, missing bits are identified 

AnswerRe: How to proceed and execute LDPC decoding using Data Structure in C Pin
Richard MacCutchan26-Jun-17 22:59
mveRichard MacCutchan26-Jun-17 22:59 
AnswerRe: How to proceed and execute LDPC decoding using Data Structure in C Pin
leon de boer27-Jun-17 5:36
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GeneralRe: How to proceed and execute LDPC decoding using Data Structure in C Pin
Member 1326117527-Jun-17 19:19
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QuestionDisecting a PE File, Revisited Pin
Bram van Kampen26-Jun-17 14:56
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Questionhow to use memset to fill a char array with space key? Pin
focusdoit25-Jun-17 3:01
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