论文标题
极地代码的快速解码
Fast-SCAN decoding of Polar Codes
论文作者
论文摘要
极地代码能够在连续取消（SC）解码下实现无内存通道的能力。软取消（扫描）是基于SC计划的软输出解码器，可用于迭代解码和极性代码的串联。但是，与最先进的代码相比，该解码器的顺序性质导致高解码潜伏期。为了减少扫描的潜伏期，在本文中，我们确定了与特定的冷冻位序列相对应的解码树中的特殊节点，并为每个序列提出了专用的低延迟解码方法。与标准扫描相比，最终的快速解码器不会改变软输出，同时大大降低了解码延迟并产生相同的误差校正性能。
Polar codes are able to achieve the capacity of memoryless channels under successive cancellation (SC) decoding. Soft Cancellation (SCAN) is a soft-output decoder based on the SC schedule, useful in iterative decoding and concatenation of polar codes. However, the sequential nature of this decoder leads to high decoding latency compared to state-of-the-art codes. To reduce the latency of SCAN, in this paper we identify special nodes in the decoding tree, corresponding to specific frozen-bit sequences, and propose dedicated low-latency decoding approaches for each of them. The resulting fast-SCAN decoder does not alter the soft-output compared to the standard SCAN while dramatically reducing the decoding latency and yielding the same error-correction performance.
