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中文摘要：
针对超宽带系统中现有的技术及硬件水平难于实现理想的功率控制，使系统的误码性能下降的问题，提出一种非理想功率控制下超宽带系统的多用户模型，得到系统的平均误码率，并同理想功率控制系统之间的平均误码性能进行了比较．结果表明：随着信道衰减系数、用户数和数据传输速率的增加，两者之间的差距逐渐变大．在各种参数条件下，用户传输速率的上限都随着系统用户数的增大而减小，而且减小的速率越来越慢．
英文摘要：
In ultra-wideband （UWB） system, it is difficult to realize the ideal power control by using existing hardwires, which degrades the performance of UWB systems . Thus a model for the analysis on the performance of UWB system under imperfect power control is proposed, and the average bit error rate （BER） of the UWB systems is obtained. Moreover, the average BER under imperfect and perfect power control is compared. Results show that the difference between these two systems concerning the average of probability error increases with the increase of the transmission attenuation, the number of users as well as the transmission data rate. For each system parameter, the upper bound of transmission data rate decreases with the increasing number of users, and the decreasing rate gets lower and lower.
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