Stochastic Multiple Stream Decoding of Cortex Codes
Matthieu Arzel, Cyril Lahuec, Christophe Jégo, Warren J. Gross, Yvain Bruned · IEEE Transactions on Signal Processing · 2011
Being one of the most efficient solutions to implement forward error correction (FEC) decoders based on belief propagation, stochastic processing is thus a method worthy of consideration when addressing the decoding of emerging codes such as Cortex codes. This code family offers short block codes with large Hamming distances. Unfortunately, their construction introduces many hidden variables making them difficult to be efficiently decoded with digital circuits implementing the Sum-Product algorithm. With the introduction of multiple stochastic streams, the proposed solution alleviates the hidden variables problem thus yielding decoding performances close to optimal. Morevover, this new stochastic architecture is more efficient in terms of complexity-throughput ratio compared to recently published stochastic decoders using either edge or tracking forecast memories.