On list decoding of 5G-NR polar codes
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The 5G standardization process of the 3GPP included polar codes concatenated with distributed cyclic redundancy check (CRC) as a channel coding scheme for downlink control information. Whereas CRC bits allow to improve the performance of successive cancellation list (SCL) decoders by improving distance properties, distributed CRC bits allow for path pruning and decoding early-termination. In this letter, we show how to take advantage of the distributed CRC to improve SCL decoding, proposing various schemes having different early-termination and error correction properties. Simulation results compare the proposed decoding schemes, showing different tradeoffs between error-correction performance and early-termination with different decoder parameters.
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