Puncturing schemes for rate-compatible non-binary LDPC codes

Finding good puncturing patterns for rate compatible non-binary LDPC codes are considered over additive white Gaussian noise (AWGN) channels in this paper. We first study several popular puncturing schemes for binary LDPC codes and generalize them to non-binary LDPC codes, where the effects of short cycles in Tanner graph are rarely investigated. By care fully studying the impacts of short cycles when puncturing, we put forward a novel puncturing scheme for rate-compatible non binary LDPC codes. Simulation results show that the proposed puncturing scheme is superior to the above known ones for rate compatible non-binary LDPC codes over AWGN channels at certain cases.