  A hybrid automatic repeat request (HARQ) scheme based on a novel class of
rate-compatible polar (\mbox{RCP}) codes are proposed. The RCP codes are
constructed by performing punctures and repetitions on the conventional polar
codes. Simulation results over binary-input additive white Gaussian noise
channels (BAWGNCs) show that, using a low-complexity successive cancellation
(SC) decoder, the proposed HARQ scheme performs as well as the existing schemes
based on turbo codes and low-density parity-check (LDPC) codes. The proposed
transmission scheme is only about 1.0-1.5dB away from the channel capacity with
the information block length of 1024 bits.
