Automorphism Ensemble Decoding of Reed-Muller Codes
Abstract
Reed-Muller (RM) codes are known for their good maximum likelihood (ML) performance in the short block-length regime. Despite being one of the oldest classes of channel codes, finding a low complexity soft-input decoding scheme is still an open problem. In this work, we present a versatile decoding architecture for RM codes based on their rich automorphism group. The decoding algorithm can be seen as a generalization of multiple-bases belief propagation (MBBP) and may use any polar or RM decoder as constituent decoders. We provide extensive error-rate performance simulations for successive cancellation (SC)-, SC-list (SCL)- and belief propagation (BP)-based constituent decoders. We furthermore compare our results to existing decoding schemes and report a near-ML performance for the RM(3,7)-code (e.g., 0.04 dB away from the ML bound at BLER of ) at a competitive computational cost. Moreover, we provide some insights into the automorphism subgroups of RM codes and SC decoding and, thereby, prove the theoretical limitations of this method with respect to polar codes.
Cite
@article{arxiv.2012.07635,
title = {Automorphism Ensemble Decoding of Reed-Muller Codes},
author = {Marvin Geiselhart and Ahmed Elkelesh and Moustafa Ebada and Sebastian Cammerer and Stephan ten Brink},
journal= {arXiv preprint arXiv:2012.07635},
year = {2021}
}
Comments
Accepted for Publication in IEEE Transactions on Communications