We introduce a new family of polar-like codes, called Partially Polarized Polar (PPP) codes. PPP codes are constructed from conventional polar codes by selectively pruning polarization kernels, thereby modifying the synthesized bit-channel capacities to ensure a guaranteed number of non-frozen bits available early in decoding. These early-access information bits enable more effective early termination, which is particularly valuable for blind decoding in downlink control channels, where user equipment (UE) must process multiple candidates, many of which carry no valid control information. Our results show that PPP codes offer substantial performance gains over conventional polar codes, particularly at larger block lengths where hardware limitations restrict straightforward scaling. Compared with existing methods such as aggregation or segmentation, PPP codes achieve higher efficiency without the need for additional hardware support. Finally, we propose several frozen-bitmap design strategies tailored to PPP codes.

翻译：本文提出一类新型的类极化码，称为部分极化极化（PPP）码。PPP码通过对传统极化码的选择性极化核剪枝构建而成，从而修改合成比特信道容量，确保在解码早期阶段可获得确定数量的非冻结比特。这些早期可访问的信息比特能够实现更有效的早期终止机制，该特性对于下行控制信道中的盲解码尤为重要——用户设备（UE）在此场景中必须处理多个候选码字，而其中多数并不携带有效控制信息。实验结果表明，PPP码相较于传统极化码具有显著的性能增益，尤其在硬件限制阻碍直接扩展的较大码长场景中表现突出。与聚合或分段等现有方法相比，PPP码无需额外硬件支持即可实现更高效率。最后，本文针对PPP码提出了多种定制化的冻结比特图设计策略。