为分析多径环境下脉冲超宽带跳时多址系统的传输性能，通过研究IEEE802.4.53a工作组给出的多 径信道参考模型，提出了一个同时存在符号间干扰、符号内多径干扰和多用户干扰的跳时超宽带系统相干解 调的性能分析模型，分别得到了符号内多径干扰、符号间干扰和多用户干扰的方差，且推导得到了系统的误 比特率计算公式，并用计算机仿真验证了公式的有效性。通过计算相邻多径的平均间隔，论证了符号内脉冲 自身多径的干扰是不可忽略的。在不同的信道环境下，以一定误码率要求作为衡量标准，比较了单用户系统 中仅考虑符号间干扰和同时考虑符号内多径干扰及符号间干扰的用户最高传输速率，并分析了多用户系统 中接入不同用户数时对应的平均传输速率的上限。

To analyze the time- hopping (TH) impulse radio Ultra- Wideband (UWB) transmission performance in the presence of multipath, a model for Bit Error Rate (BER) analysis of UWB systems with coherent demodulation in the presence of inter- symbol interference, intra- symbol multipath interference , and multiple access interference is proposed by studying the statistics of multipath channel models, which is defined by the IEEE 802.15.3a Task Group, and then through calculating the variance of intra- symbol interference, inter- symbol interference and multiuser interference, system BER formulation is obtained and verified in comparison with computer simulations. By analyzing the average multipath interval and comparing BERs with and without intra- symbol interference , the results show that intra- symbol interference should not be neglected. Finally, to satisfy BER requirement, in various channel environments, the maximum transmission data rate is analyzed by both considering and neglecting intra- symbol interference in single user system, and the maximum average transmission data rate is analyzed corresponding to different user numbers in multi- user system .