编码论基本概念 01

通信系统模型

通信系统模型

通信系统模型2

编码分类

编码分类

信息论研究编码的方法

系统码和非系统码

In coding theory, a systematic code is any error-correcting code in which the input data is embedded in the encoded output. Conversely, in a non-systematic code the output does not contain the input symbols.
For a systematic linear code, the generator matrix,

, can always be written as

, where

is the identity matrix of size

针对系统码来说，原始符号包含在输出的编码符号中。

系统码

码率

码率

在线性分组码中，这里的码率指的是编码效率，假设源符号有k个，编码为n个符号，则码率为 k/n。

References:

https://en.wikipedia.org/wiki/Systematic_code
https://www.qualcomm.com/documents/using-raptor-codes-solve-packet-loss-iptv-networks
https://wenku.baidu.com/view/ebe850dadd88d0d233d46a54.html?from=search
https://wenku.baidu.com/view/f157701652d380eb62946d44.html