循环码是线性分组码中的一类重要字码。它具有纠错能力强和易于实现的特点,它适合于代数方法进行研究,编译码的设备也比较简单,再实际中得到了广泛的应用.-cycle linear block code is the code of a kind of important code. It has error correction capability and feature easy to implement, it is suitable for algebraic methods, encryption equipment is relatively simple, more practical be widely used.