超宽带通信中的伪混沌脉冲位置调制

摘要

A novel pseudo chaotic pulse position modulation(PCPPM) was proposed which was suitable for ul-trawide-bandwith impulse radio communication systems, in this scheme, symbolic dynamics of a chaotic map was used for chaotic pulse position modulation(CPPM), the separation between the adjacent pulses were determined by chaotic dynamics and binary information was modulated onto this carrier by the pulse position modulation method. System could acquire synchronization automatically without any specific "hand shaking"protocol. The advantages of PCPPM are decrease of the measurement precision of interpulse intervals and suitable for all digital solution. Since a random distribution of interpulse intervals, the resulting spectrum is a noise like spectrum. Finally, the performances of PCPPM were analyzed and simulated.%提出了一种新的适于超宽带脉冲通信的伪混沌脉冲位置调制方式(PCPPM),该方式采用符号动力学对混沌脉冲位置调制方式(CPPM)进行了改进,作为载波的脉冲串的相邻脉冲之间的间隔由混沌映射的符号动力学特性确定,采用脉冲位置调制方式对二进制符号进行调制.系统可以在无辅助握手的情况下获得同步.与CPPM相比,其降低了对脉冲间距的测量精度要求,适合数字方式实现.由丁系统输出的脉冲间隔是随机分布的,具有近似噪声的频谱特性,最后对系统的性能进行了分析和仿真.