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A Fast Software Polar Decoder

Among modern error-correcting codes, the newly discovered polar codes are the first ones to provably achieve channel capacity with an explicit construction. While their error-correction performance at moderate block lengths is mediocre, polar decoders can be implemented with a throughput that scales well with length and rate. We present a software implementation of the RSM-SSC decoding algorithm that leverages the SIMD units available in most general-purpose CPUs. The throughput per kilohertz per core (TNDC) of this design is shown to be well suited for software-defined-radio applications. We also show that, for a similar error-correction performance, the TNDC of a systematic polar code surpasses that of state-of-the-art software LDPC decoders.