摘要
超宽带(UWB)脉冲通信是一种与其它技术有很大不同的无线通信技术，它具有通信容量大、辐射功率密度低，抗多径干扰，结构简单和保密性好等优点。利用UWB脉冲通信是对无线频谱资源的利用进行新的探索，它解决了困扰传统无线技术多年的有关传播方面的重大问题。这项新兴技术对方兴未艾的无线接入技术是一个有力的支持，因此需要深入研究并掌握这项技术。
本文首先阐述了UWB脉冲通信系统的基本原理，重点介绍了用伪随机码跳时的PPM(脉冲位置调制)调制，分析了他的多址性能、系统容量和功率谱密度，在此基础上研究了改进性能的发射信号形状和系统抗干扰能力，最后介绍了伪混沌码跳时的多址方式。整个分析结合进行了MATLAB仿真。
Ultra-Wideband (UWB) pulse communication is a very different communication technique from others. It has characteristics of high system capacity, low power spectral densities, exceptional multiparth immunity, simple structure and low probability of detection. The UWB pulse communication is new exploration of radio spectrum, and it resolves the important problem of radio propagation. For its strong support to wireless input, we should study it.
In this paper we first give theory of UWB pulse communication system. Then we introduce pulse position modulation (PPM) using PN code and analysis its multi-access performance, system capacity and power spectrum density. On the basis of those analyses, we study the pulse shape and the anti-jamming ability of the system. At last, multiple access with pseudochaotic time hopping is introduce. During the analysis, simulation with Matlab is done.
引文
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