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摘 要
超宽带通信技术是一种全新的短距离无线通信技术。它利用极窄脉冲传输数据，具有传输速率高、功耗低、抗多径能力强等许多优点，并且由于频谱的功率谱密度极小，它通常具有扩频通信的特点。该技术以其独有的特性正受到通信学术界和产业界乃至军方的重视，并将取得进一步的发展，获得日益广泛的应用。
本文首先概括地介绍了超宽带无线通信的基础知识，重点研究TH-UWB信号特点及传播特性，对比超宽带信道模型与窄带无线信道的不同，在此基础上分析路径损耗模型和多径衰落模型对PPM-TH-UWB超宽带信号传输的影响。利用MATLAB仿真分析了PPM-TH-UWB和PAM-TH-UWB信号时域表达式及其功率谱密度（PSD），同时对修改的S-V室内信道模型进行建模，在此基础上仿真分析了脉冲超宽带信号在此信道模型下的传输特性，分析模型参数对信号传输的影响。
关键词：超宽带；脉幅脉位调制；功率谱密度；平均功率时延；均方根时延
Abstract
Ultra-wideband communication technology is a new short-range wireless communication technology. It was used by very narrow pulses to transmit data with a high transfer rate, low power consumption, anti-multipath capability and many other advantages，and because of the spectrum of power spectral density is extremely small, it usually has the characteristics of spread spectrum communication. The technology with its unique features is paying more attention by the communications and the academic, even the military. And it will make more development, access to an increasingly wide range of applications.
The paper first briefly introduced the basic knowledge of ultra-wideband wireless communications, which focuses on the TH-UWB signal propagation characteristics and compared the different of ultra-wideband channel model with narrow-band radio channel, based on this analysis of path loss model and the multipath fading model PPM-TH-UWB Ultra-Wideband Signal Transmission. With using MATLAB simulated analysis the use of PPM-TH-UWB and PAM-TH-UWB signal the time-domain expression and the power spectral density (PSD), at the same time on the modified S-V channel model for indoor modeling. On the basis of simulated analysis of the pulse signal of UWB channel model in transmission characteristics, on the impact of signal transmission under the analysis of model parameters.
Key words: Ultra-Wideband; PPM pulse rate; Power spectral density; Average power delay; RMS Delay