基于非均匀信道极化的速率兼容极化码设计研究
Study of Design of Rate-Compatible Polar Codes Based on Non-Uniform Channel Polarization
摘要：
提出了一种适用于加性高斯白噪声信道的速率兼容任意长度极化码构造方案。该方案是基于非均匀信道极化的概念。原始的极化码只能被设计为具有2的幂的码长度。打孔、缩短和扩展是获得任意极化码码长和码率的三种策略。存在设计具有任意长度但具有更高复杂度的编码和解码的代码的其他方式，诸如多核、级联码和用于置信传播（BP）或连续消除（SC）解码的特定构造。通常，通过这些任意长度技术投影的比特信道的质量不同于原始比特信道的质量，这可以极大地影响构造的极化码的性能。所提出的基于高斯近似的非均匀极化（NUPGA）是用于速率兼容的任意长度极化码的有效构造技术，其选择最佳信道（即，选择信息比特的位置）。针对极化和再极化过程设计了高斯近似的推广。我们还提出了设计极化码的缩短和扩展技术。仿真结果验证了所提出的NUPGA设计对现有的速率兼容技术的有效性。
英文摘要：
We propose a novel scheme for rate-compatible arbitrary-length polar code construction for the additive white Gaussian noise (AWGN) channel. The proposed scheme is based on the concept of non-uniform channel polarization. The original polar codes can only be designed with code lengths that are powers of two. Puncturing, shortening and extension are three strategies to obtain arbitrary code lengths and code rates for polar codes. There are other ways to design codes with arbitrary length but which have encoding and decoding with higher complexity such as multi-kernel, concatenated codes and specific constructions for Belief propagation (BP) or Successive Cancellation (SC) decoding. In general, the quality of the projected bit channels by these arbitrary-length techniques differs from that of the original bit channels, which can greatly affect the performance of the constructed polar codes. The proposed Non-Uniform Polarization based on Gaussian Approximation (NUPGA) is an efficient construction technique for rate-compatible arbitrary-length polar codes, which chooses the best channels (i.e., selects the positions of the information bits) by re-polarization of the codeword with desired length. A generalization of the Gaussian Approximation is devised for both polarization and re-polarization processes. We also present shortening and extension techniques for design polar codes. Simulations verify the effectiveness of the proposed NUPGA designs against existing rate-compatible techniques.
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