5G通信必须用到的编码：Turbo码是Claude.Berrou等人在1993年首次提出的一种级联码。基本原理是编码器通过交织器把两个分量编码器进行并行级联，两个分量编码器分别输出相应的校验位比特；译码器在两个分量译码器之间进行迭代译码，分量译码器之间传递去掉正反馈的外信息，这样整个译码过程类似涡轮（Turbo）工作。因此，这个编码方法又被形象地称为Turbo码。Turbo码具有卓越的纠错性能，性能接近香农限，而且编译码的复杂度不高。-5G communication must be used in coding: Turbo code is a concatenated code Claude.Berrou et al in 1993 first proposed. The basic principle is that the encoder by interleaving the two components is parallel concatenated encoder, two component encoder outputs the parity bit bit　decoder between the two components decoder iterative decoding, remove extrinsic information transfer between the positive feedback component decoder, so that the entire decoding process similar turbine (turbo) work. Thus, this coding method has been aptly called Turbo codes. Turbo codes have excellent error correction performance, performance close to the Shannon limit, and the complexity of the codec is not high.