TH-PPM UWB系统的多址接入性能分析

Multiple-Access Performance Analysis in TH-PPM UWB System

为了使跳时脉冲相位调制超宽带(TH-PPM UWB)系统的多址接入性能尽可能满足系统要求,提高系统容量,首先在标准高斯近似的假设下,给出了TH-PPM UWB系统的多址接入误码率公式,然后分析了影响TH-PPM UWB系统的多址接入性能的各个因素,通过实验仿真验证了调整脉冲形成因子、PPM调制偏移量和每比特内码片数量可以改善系统的多址接入性能,但是这三个因素是受系统条件制约的,实际应用中应该根据系统指标,合理选择参数,才能达到预期的效果。

To ＂make TH - PPM UWB system＇ s multiple - access performance satisfy the requirement of system, and improve the capacity of system,in case of Gauss, the expression of the BER in the multiple - access environment is given first, then the influences of pulse shaping factor, the PPM modulation time shift and the number of code chips for each bit on the multiple - access performance have been analyzed carefully. Finally it is validated that adjusting the pulse shaping factor, changing the PPM modulation time shift and adjusting the number of code chips for each bit can improve the multiple - access performance of TH - PPM UWB system through computer simulation. But the three factors are subject to the conditions of system, so the desired result could only be obtained when the system parameters are chosen reasonable according to the requirement of system.