Abstract—In this correspondence, we propose an approach to construct irregular low-density parity-check (LDPC) codes based on quasi-cyclic extension. When decoded iteratively, the constructed irregular LDPC codes exhibit a relatively low error floor in the high signal-to-noise ratio (SNR) region and are subject to relatively few undetected errors. The LDPC codes constructed based on the proposed scheme remain efficiently encodable.
Jinghu Chen, R. Michael Tanner, Juntan Zhang, Marc P. C. Fossorier
July 23, 2013
Construction of Irregular LDPC Codes by Quasi-Cyclic Extension