Performance Analysis of Interleaver for Polar Coding in Bit-Interleaved Coded Modulation System

A bit-interleaved polar-coded modulation (BIPCM) system was proposed in this paper. Considering the complexity of code construction, the polarization weight (PW) independent of the specific signal-to-noise ratio (SNR) was employed. For decoding, the successive cancellation (SC) decoding is to be known with a low complexity. Further, a unified description of BICM system was given, and the design of interleaver for polar code was analyzed in this paper. To evaluate the performance of interleaver for BIPCM system, the system with two existing interleaving algorithms were compared. Simulation is performed in the additive white Gaussian noise (AWGN) channel model with 16 quadrature amplitude modulation (QAM) signaling based on Gray mapping. It is shown that the system with random interleaver has a better performance of about 0.25–0.36 dB over the contrastive system. Moreover, the performance of equal interleaver scheme has a maximum gain of about 0.24 dB compared with the contrastive system at the low SNR.