An approach to selecting information indices for polar codes is proposed to form signals with spectral comb shapes under BPSK modulation, whereby the signal could be separated from periodic interference in spectrum. By confining information indices to an index set termed comb-shaping index set (CIS) proposed in this paper, a spectral comb shape signal is formed, which has periodic nulls and notch bands in its spectrum. Furthermore, we propose a novel construction for polar coding under the CIS constraint. Numerical results are given under periodic interference and AWGN noise, indicating that a considerable signal-to-noise power ratio (SNR) gain is accomplished in comparison with conventional polar codes.

翻译：提出一种极化码信息索引选择方法，用于在二进制相移键控调制下形成具有光谱梳状形状的信号，使该信号可与周期性干扰在频谱上分离。通过将信息索引限制在本文提出的梳状整形索引集内，可形成频谱具有周期性零点与陷波带的光谱梳状信号。进一步地，我们提出一种在梳状整形索引集约束下极化码的新型构造方案。在周期性干扰与加性高斯白噪声环境下的数值结果表明，与传统极化码相比，该方法可获得显著的信噪比增益。