中文摘要：

研究了基于声表面波器件的啁啾超宽带系统的多址性能，提出一种多载波方式的啁啾超宽带编码方案；在该方法的基础上，针对多载波通信存在的问题，进一步提出具备不同扫频率的啁啾超宽带多址系统，并对两种系统进行了仿真实验．仿真结果表明：两种多址方案均能有效地抵抗多址干扰；多载波方式的啁啾超宽带系统需要设计合理的频率间隔以减少码间干扰；多扫频率的啁啾超宽带系统可以克服高峰均比和严重码间干扰．

英文摘要：

Multi-access capability of the chirp ultra-wideband （UWB） system generated by surface acoustic wave device has been studied and a multi-carder chirp UWB encoding proposal has been put forward to tackle the problems in multi-carrier scheme, multi-access chirp UWB system with various sampling frequency rates has been proposed and simulations have been carried out for the two systems. Simulation results show that the two multi-access schemes perform well in mitigating multi-access interference （MAI）. Multi-carrier chirp UWB system needs a suitable frequency interval to mitigate inter-symbol interference （ISI） while multi-sampling frequeucy rate chirp UWB system can overcome peak-to-average power ratio （PAPR） and serious ISI as well as MAI.