跳时超宽带（TH-UWB）多址系统性能的研究

针对多用户跳时超宽带（TH-UWB）系统建立了数学模型，其目的在于研究多址干扰对（TH-UWB）系统各 方面性能的影响。利用多址干扰服从高斯分布的特性，分析了多址系统的误码率性能，得到了系统数据速率及上 界的解析数学表达式，并将误码率理论值与实验数据进行了比较。仿真结果表明，误码率理论值与实验值一致。 此外，还分析了在不同的室内密集信道下功率控制对系统数据速率的影响，结果表明，非精确的功率控制将导致系 统的误码率及数据速率的下降，且可视距信道中的性能好于非可视距信道中的系统性能。

Study on performance of TH-UWB multi-access system

Mathematical model is constructed for the multi-user TH-UWB system, aiming to analyze the effects of multiple access interference (MAI) on the performance of such a system. BER performance is derived according to the theory that MAI is Gaussian with a large number of users. Besides, the upper bound is given using mathematical expression. Simulation results show that the theoretical BER formula corresponds well with the experimental ones. The effect of power control on the system under different ultra wideband (UWB) channel is also studied through simulation, showing that imperfect power control will lead to the decrease in system data rate, and that performance in line of sight (LOS) channel often outdoes that in the NLOS channels.