“IMPLEMENTATION OF NON BINARY LDPC DECODER WITH IMPROVED PERFORMANCE”
Keywords:
LDPC codes, noise threshold, sparse bipartite graph, bit flipping algorithmAbstract
Low density parity-check (LDPC) code is a linear error correcting code, a method of transmitting a
message over a noisy transmission channel. An LDPC is constructed using a sparse bipartite graph. LDPC codes
are capacity-approaching codes, which means that practical constructions exist that allow the noise threshold to
be set very close (or even arbitrarily close on the BEC) to the theoretical maximum for a symmetric memory less
channel. The noise threshold defines an upper bound for the channel noise, up to which the probability of lost
information can be made as small as desired. Here implementation of the Non-Binary LDPC encoding and
decoding is done using symbol flipping algorithm on MATLAB.


