说明：  在通信领域有一个重要的组成部分就是扩频通信的技术，扩频通信能越来越流行的原因是因为它有着很好的保密强悍的抵抗干扰的能力，这也是扩频通信能得到广泛的运用的本质的原因。pn码的仿真
(There is an important part of the communication area is spread spectrum communication technology, spread spectrum communication can be more and more popular because it had a very good secrecy strong resistance to interference, which is the essence of the spread spectrum communication can be widely used. )