Block-fading (BF) channel, also known as slow-fading channel, is a type of simple and practical channel model that can characterize the primary feature of a number of wireless-communication applications with low to moderate mobility. Although the BF channel has received significant research attention in the past twenty years, designing low-complexity outage-limit-approaching error-correction codes (ECCs) is still a challenging issue. For this reason, a novel family of protograph low-density parity-check (LDPC) codes, called root-protograph (RP) LDPC codes, has been conceived recently. The RP codes can not only realize linear-complexity encoding and high-speed decoding with the help of a quasi-cyclic (QC) structure, but also achieve near-outage-limit performance in a variety of BF scenarios. In this article, we briefly review the design guidelines of such protograph codes with the aim of inspiring further research activities in this area.
翻译:区块淡化(BF)频道,又称慢淡化频道,是一种简单实用的频道模式,可以描述一些低到中等流动性无线通信应用程序的主要特点,虽然BF频道在过去二十年中受到大量研究关注,但设计低复杂性排出限制-接近错误校正代码(ECCs)仍是一个具有挑战性的问题。为此,最近设计了一个新型的编程低密度低密度对等(LDPC)代码组,称为root-protography(RP) LDPC代码组。RP代码不仅可以在准周期(QC)结构的帮助下实现线性兼容编码和高速解码,而且还在各种BF情景中实现近距离限制性功能。我们在此简要回顾这类程序代码的设计指南,目的是激励这一领域的进一步研究活动。