A novel method to improve the spectral efficiency of Time Hopping Pulse Position Modulation (THPPM) system was presented in this paper, which the traditional UWB system did not consider of. By combining 1-13 derivative of the Gauss pulses, a combination pulse which can approach the FCC criterion, was designed. A Simulink based simulation of the THPPMUWB ( Ultra Wide Band) system, the inner schemes of models and simulation signals of receiver via correlation mask were also given. Simulation results prove that the developed method shall improve the performance of THPPMUWB system remarkably. In addition, user custom algorithmic blocks builded and encapsulated in the paper extends application fields of Simulink as well as simplifies simulation course.%传统跳时脉冲位置调制(THPPM)系统未考虑系统在全频段的利用率,为此,提出了一种提高系统频谱利用率的方法.基于FCC室内辐射掩蔽,通过组合1～13阶高斯脉冲,设计了一种逼近规范的组合脉冲,建立了使用该组合脉冲的THPPM通信系统仿真模型,给出了接收信号与掩膜的仿真波形和模型内部结构图.与使用传统脉冲滤波器的系统频谱利用率进行了分析和比较,仿真结果表明,通过应用组合脉冲显著提高了系统在全频段的利用率.此外,对Simulink设计的模块进行封装,独立组建了超宽带模块库,简化了仿真过程,扩展了Simulink在超宽带方面的应用.
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