Exact(4)
"The overall figure of the number of recruiters who check degree qualifications with the awarding body is only around 20%," said Rowley.
Variable and check degree distributions (In other words, the parity matrix of a LDGM code has exactly nonzero entries per row and nonzero entries per column).
The outer code of a PA code is a simple, structured LDPC code with left (variable) degree profile and right (check) degree profile ; and the inner code is a differential encoder.
Accordingly, the first set does not consider any outer BCH coding, and only identical LDGM codes of rate (input symbols per coded symbol), variable and check degree distributions, and input blocklength are utilized at every sensor.
Similar(56)
The optimization algorithm in [3] designs the code C 2 corresponding to H2, by considering the rate-compatible constraints for variable and check node degree distributions given the degree distributions of the code C 1.
In the same way as for the code with low rate in Section 4.1.1, the code C 2 with high rate is also designed such that it has the error floor at lower bit error rates and the waterfall region at a lower SNR by keeping the minimum check node degree in all the check node degree distributions equal to 11.
We can reformulate the problem as follows: for a given check node degree profile and a control point in the EXIT chart, where, (16).
Code C 1 is designed with a concentrated check node degree distribution ρ C 1 = x 6, since concentrated check node degree distributions have been shown to perform well[16].
We observe that for d<0.6, the code designed with the check node degree distributions, which have the lowest fraction of edges of the minimum degree, has its waterfall region at high SNR as compared to the codes with check node degree distributions with a higher fraction of edges of the minimum degree.
All the check node degree distributions for C 2 satisfy the rate-compatible constraint for the check node degree distribution as defined by (17).
The four non-concentrated check node degree distributions for C 2 satisfy the rate-compatible constraint for the check node degree distribution as defined by (17).
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