中文摘要：

针对混沌脉位调制超宽带系统具有较高误码率的缺点，提出了一种新的混沌跳时脉冲调幅超宽带系统．论述了系统的原理和结构，从理论上给出了系统在加性高斯白噪声信道中的误码率解析式．分析和仿真表明，混沌跳时脉冲调幅超宽带系统保留了混沌脉位调制超宽带系统的优点，而且在相同的信噪比下具有更低的误码率；在相同的误码率下，混沌跳时脉冲调幅超宽带系统的信噪比可以比混沌脉位调制超宽带系统节约3dB．

英文摘要：

Aim at the ultra- wideband （UWB） system＇s the disadvantage of high bit error rate （BER）, a novel chaotic time -hopping pulse amplitude modulation （CTH -PAM） UWB system was put forward by using chaotic pulse position modulation （CPPM）. Its principle and structure were discussed. In Additive White Gaussian Noise （AWGN） channel the BER of system was given in theory. Analysis and simulation show resuits that CTH - PAM UWB system can reserve the virtue of CPPM UWB system. In the same signal to noise ratio （SNR） , compared with CPPM UWB system, CTH - PAM UWB system has lower BER. In the same BER, it can save 3 dB SNR.