b*****k
发帖数: 80 | 1 yes,it's a block code
the parity check matrix is very sparse,or said differently, low density.
Gallegar discovered this in 60s and people rediscover this code
in late 90s which shows performance(w/ 10^7 block length)
very close to shannan capacity.
This code and another popular codes--turbo codes use similiar
iterative decoding stragety. A new tool--factor graph
(or normal graph in Forney's vocabulary)
is also formulated to anaylize the behavior of those codes.
LDPC code has lower decoding compl |
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