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This paper proposes protograph-based Raptor-like (PBRL) codes as a class of rate-compatible (RC) LDPC codes for binary-input AWGN channels. As with the Raptor codes, exclusive-OR operations on precoded bits produce additional parity bits providing extensive rate compatibility. Unlike Raptor codes, each additional parity bit in the protograph is explicitly designed to optimize the density evolution threshold. During the lifting process, ACE and CPEG constraints are used to avoid undesirabledoi:10.1109/tcomm.2015.2404842 fatcat:h7djghoqmvaivmptbbe2b6q5om