A Polar Code Hybrid Rate Matching Scheme.

In recent 3GPP NR standards discussions for 5G, polar codes have been adopted as the control channel coding scheme when the payload size is more than 11 bits. The rate matching schemes for polar codes include shortening, puncturing and repetition. Each of these rate matching schemes has a performance advantage for different conditions. Hence, it is beneficial to include all three types of rate matching schemes. A circular buffer is also designed to support these rate matching schemes. In this paper, we propose a hybrid rate matching scheme which incorporates both shortening and puncturing techniques. This hybrid rate matching scheme provides a performance advantage for some conditions. Also, this hybrid rate matching scheme does not cause a significant impact on the existing polar coding system architecture. Simulation results are provided to show the performance benefit of this hybrid rate matching scheme.