摘要
在复杂电磁环境中,直接序列扩频作为现代通信系统最常用的通信体制,会受到诸多人为和非人为干扰。针对直扩系统抗干扰性能进行研究,提出了基于复合映射产生混沌二值序列,并通过平衡性和相关特性对序列进行筛选优化。以优选后的复合混沌扩频码应用于直扩系统,对系统设计仿真。仿真结果表明,该复合混沌码直扩系统在不同信噪比和干扰环境下,抗干扰性能优于其它扩频码,系统误码率降低,误码率增益提高5dB。
As one of the most widely used communication scheme, DSSS will be interfered by human or other sources in compli- cated electromagnetic environment. Chaos binary sequence based on composite mapping is proposed, pointing to the anti-jamming performance of direct sequence spread system. The sequences are chosen through the character of equilibrium and correlation. The chosen compound chaotic spreading codes is applied to direct sequence spread system. The simulation result shows that the proposed chaos sequence is better than other sequences under different signal-to-noise ration and jamming condition. The decrease of systems error rate is validated by practical application. The plus of error rate is 5dB.
出处
《计算机工程与设计》
CSCD
北大核心
2012年第10期3715-3719,共5页
Computer Engineering and Design
关键词
复杂电磁环境
直接序列扩频
复合映射
混沌扩频码
收缩法
序列优选
Key words： complicated electromagnetic environment
direct sequence spread spectrum （DSSS）
composite map
chaotic sprea-ding code
constringency method
sequence optimization
