中文摘要：

针对异步跳时脉冲无线电超宽带（impulse radio ultrawide band，IR-UWB）多用户系统中存在多用户干扰，分别推导了当多用户干扰相对于输出噪声能以高概率忽略不计时密集网络和扩展网络所需的IR-UWB信号渐近带宽．理论研究表明所得到的IR-UWB信号渐近带宽与网络内的用户数成正比，而且密集网络所需的IR-UWB信号的渐近带宽远大于扩展网络的．当IR-UWB信号带宽满足理论渐近带宽时，多用户系统的差错概率就简化为单用户系统的差错概率．

英文摘要：

Multi-user interference occurs in an asynchronous time hopping impulse radio ultra-wide band （IR-UWB） multi- user system, therefore the asymptotic bandwidths of IR-UWB signal of dense network and extended network are derived respectively when the multi-user interference can be negligible with respect to output noise with high probability. The theoretic study results indicate that the obtained asymptotic bandwidth of IR-UWB signal is in direct proportion to the numbers of user. The asymptotic bandwidth of IR-UWB signal required by the dense network is much more than that by extended network. As the bandwidth of IR-UWB signal satisfies the obtained theoretic asymptotic bandwidth, the probability of error of the multi-user system is simplified to that of the single user system.