Title: On Multilevel Coding Schemes Based on Non-Binary LDPC Codes,
Abstract: We address the problem of constructing of coding schemes for the channels
with high-order modulations. It is known, that non-binary LDPC codes are
especially good for such channels and significantly outperform their binary
counterparts. Unfortunately, their decoding complexity is still large. In order
to reduce the decoding complexity we consider multilevel coding schemes based
on non-binary LDPC codes (NB-LDPC-MLC schemes) over smaller fields. The use of
such schemes gives us a reasonable gain in complexity. At the same time the
performance of NB-LDPC-MLC schemes is practically the same as the performance
of LDPC codes over the field matching the modulation order. In particular by
means of simulations we showed that the performance of NB-LDPC-MLC schemes over
GF(16) is the same as the performance of non-binary LDPC codes over GF(64) and
GF(256) in AWGN channel with QAM64 and QAM256 accordingly. We also perform a
comparison with binary LDPC codes.