A Novel Design of CRC-concatenated Polar Codes

Typical construction of CRC concatenated polar codes append the CRC bits at the end of information bits and then feeds the resulting vector as input to the polar encoder. This construction comes with a caveat that CRC check cannot be performed till all information bits are decoded by the polar decoder. Hence it becomes impossible to do an early termination (ET) of successive cancellation decoder in the case of decoding failure, thereby causing latency and unnecessary power consumption associated with the decoding of bits that follow the first error bit. While interleaving of CRC codeword prior to polar encoding can make ET possible, but it can potentially jeopardize the undetected error rate (UER) of the code. In this paper, a novel construction of interleaved-CRC assisted polar codes is proposed aimed at high ET gain while controlling the rise in UER. Exemplary simulation results are provided.