密集多径信道中直接序列超宽带系统的性能分析

在密集多径信道中,通过研究直接序列超宽带(DS-UWB)的Rake接收机信号模型,分析了多径干扰给接收机性能带来的影响,提出了一种分析接收机巨能的半解析方法.这种方法将高斯分布函数展开成级数形式,省略了对不同数据序列取平均的过程,从而显著降低了性能分析的计算量.仿真结果表明,该方法能有效分析密集多径信道中DS-UWB Rake接收机的性能,分析结果与仿真结果相吻合,并且比用高斯分布近似多径干扰的方法精确.

Performance Analysis for Direct Sequence Ultra-wideband System in Dense Multipath Environment

By studying the signal model of DS-UWB Rake receiver,the impact of multipath interference to the receiver performance was considered and a semi-analytical method was proposed for receiver performance analysis in the dense multipath channel. In the proposed method,the data sequences averaging step is overleapt by expanding the Gaussian distribution function into series,which significantly reduces the computation complexity of performance analysis. Simulation results show that,in dense multipath channel,the proposed method can efficiently analyze the performance of DS-UWB Rake receiver and the results accord with the simulation results and moreover it is more accurate than the method which approximates the multipath interference distribution to Gaussian distribution.