摘要
用同步的周期随机序列在时间ｋＴ（ｋ＝ １，２，…）上对收发两端的混沌系统进行驱动，从而在收发两端产生相同的周期混沌波形．以此为载波进行调制实现数字通信．采用此法尽管载波是周期的，但由于每个周期内的波形是混沌的，仍然具有类噪声性，可利用周期性来实现同步．以Ｌｏｒｅｎｚ系统为例进行了仿真，当信噪比很低时，依然可以进行可靠的通信．当不同用户采用不同的随机序列时，则可以在同一个频段内进行多址通信．
The carrier directly produced by analogous chaotic system such as the Lorenz system has a good performance of security and noise likeness, but its anti noise performance is weak and can not achieve multi address communication in the same frequency range by traditional synchronous means. Directed to this problem, this paper put forward a new approach. It drived chaotic systems in sending and receiving terminals with the same periodical random sequence at time kT(k=1,2,…) so as to get two identical periodical chaotic waves. Then through modulating these two waves, the digital communication can be achieved. In this way, the synchronization was obtained without changing its security and noise likeness. The reason is that in each period the wave is chaotic. In this paper, Lorenz system was used for the simulation. It can been seen that even when S/N is very low, the communication is still available. When several different random sequences were used, the multi address communication in the same range of frequency can be successfully achieved.
出处
《上海交通大学学报》
EI
CAS
CSCD
北大核心
2000年第2期233-236,共4页
Journal of Shanghai Jiaotong University
基金
国家自然科学基金!(69735101)
上海市留学人员专项资金资助
关键词
扩频通信
多址通信
驱动序列
混沌系统
模拟
spread spectral communication
chaos
multi address communication
driving sequence
