卫星通信的极化码短码译码技术改进

摘要：卫星通信面临着传输环境复杂、链路动态时变、业务复杂多样等难点。信道编码是保证通信可靠性的物理层关键技术，其中，极化码是当前和未来一种重要的候选编码方案。首先对极化码基本原理和编译码技术进行概述，主要包括：信道极化、极化码构造与编码、速率兼容方案和译码算法。然后，针对短极化码提出了一种串行消除列表（SCL）和阶序统计译码（OSD）级联的译码方案。与SCL相比，该方案在译码性能相当的情况下具有更低的复杂度。

关键词：极化码；信道极化；极化码构造；串行消除列表译码；阶序统计译码

Abstract: Satellite communication faces difficulties such as complex transmission environments, dynamic time-varying links, and diverse services. Channel coding is a key physical layer technology to ensure the reliability of communication, among which, polar code is an important candidate coding scheme for the present and future. In this paper, the primary principle of polar code and its construction and decoding techniques are reviewed, which mainly include, channel polarization, polar code construction and coding, rate-compatible schemes, and decoding algorithms. Then, a cascaded decoding scheme of successive cancellation list (SCL) and ordered statistic decoding (OSD) is proposed for short polar codes. Compared with SCL, SCL-OSD can achieve similar decoding performance with lower complexity.

Keywords: polar code; channel polarization; polar code construction; successive cancellation list decoding; ordered statistic decoding