中文摘要：

为了提高超宽带系统的传输效率,结合并行组合扩频技术与超宽带技术的优势,建立并行组合扩频超宽带通信系统模型.在此基础上,给出该系统在高斯白噪声背景下,采用M-PPM调制时的平均误比特率公式.并通过MATLAB仿真,验证了并行组合扩频超宽带通信系统的抗噪性能优于传统的超宽带系统.同时,并行组合扩频超宽带信号具有时域、频域二维隐蔽能力,增加了系统通信的安全性.

英文摘要：

In order to improve the efficiency of ultra-wideband systems（UWB）,the model of a newly proposed UWB communication system based on a parallel combinatory spread spectrum（PCSS-UWB） was given in this study;moreover,the bit error rate（BER） formula of the newly proposed system was derived by multiple pulse position modulation（M-PPM）,under the background of additive white Gaussian noise（AWGN）.According to the simulation,the proposed system performs better than the traditional UWB system.The proposed system also increases security since its signal is hard-detected both in time and frequency domains.