多址干扰抑制混沌超宽带脉冲设计

摘要

针对超宽带多址干扰问题,采用高斯7阶导脉冲作为UWB原始脉冲,使用厄米特矩阵特征向量分解算法设计UWB正交脉冲序列,采用Logistic混沌序列作为跳时码进行混沌跳时-脉位调制,生成混沌超宽带脉冲,从而达到抑制多址干扰的目的.最后,分析CTH-PPM UWB系统的抗多址干扰性能.仿真结果表明CTH-PPM UWB系统抗多址干扰性能明显优于TH-PPM UWB系统,具有更强的抗多址干扰能力.%Aiming at multiple site interference (MSI) problem in ultra-wideband (UWB) system,Gaussian 7th order derivative pulse is adopted as UWB preliminary pulse,Hermite matrix eigenvectors decomposing algorithm is employed to design UWB orthogonal pulses sequence,and Logistic chaotic sequence is used as the time-hopping code to execute chaotic time-hopping pulse position modulation (CTH-PPM),the chaotic UWB pulse is produced,and therefore the purpose of MSI suppression is achieved.At last,the performance of multi-site interference resistance of CTH-PPM UWB system is analysed,simulation result proves that the this performance of CTH-PPM UWB system clearly outperforms that of TH-PPM UWB system,it has stronger capability in multi-site interference resistance.