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数字通信的关键技术 DVB传输系统中采用了许多数字通信技术,包括一些最新发展的先进技术,下面我们对其中的一些比较关键的技术作进一步的讨论。 1、纠错编码纠错编码是数字通信系统的一大优点。纠错编码主要有三种类型前向纠错(FEC)、检错重发(ARQ)和混合纠错(HEC)。后两种类型用于双向通信系统中,DVB属于单向的广播,因此DVB系统中采用的是FEC。经过多年的不断研究,纠错编码已发展了很多种类,技术上也比较成熟了。按照差错控制能力分,纠错编码可分为检错码、纠错码和纠
The Key Technologies of Digital Communication Many digital communications technologies are used in the DVB transmission system, including some of the latest advances in advanced technologies. Here we discuss some of the more critical technologies. 1, error correction coding Error correction coding is a digital communication system, a major advantage. There are three main types of error correction coding, forward error correction (FEC), error recovery (ARQ) and hybrid error correction (HEC). The latter two types are used in the bidirectional communication system. DVB belongs to unidirectional broadcast, so FEC is adopted in the DVB system. After years of continuous research, error correction coding has developed a lot of types, technically more mature. According to the error control ability points, error correction coding can be divided into error detection code, error correction code and correction