DS-UWB与TH-UWB系统在多径信道下的性能分析

Analysis on Performance of DS-UWB and TH-UWB Systems in Multipath Channel

在IEEE.802.15.3a工作组建议的标准UWB室内信道模型下,采用选择性Rake接收机(S-Rake)和部分Rake接收机(P-Rake),系统分析了DS-UWB和TH-UWB系统性能,并进行了仿真。仿真结果表明,在多用户情况下,DS-UWB系统性能优于TH-UWB系统;并且随着帧数的增加,TH-UWB系统的性能将变差,而DS-UWB系统性能随码片数的增加而改善;此外,DS-UWB和TH-UWB系统性能均随S-Rake和P-Rake接收机叉指数的增加而改善,采用S-Rake接收机时的系统性能要优于P-Rake接收机。

This paper analyzes the performance of two kinds of ultra wideband systems,namely Direct Sequence （DS） and Time Hopping （TH）.In the UWB indoor channel model proposed by a study group for IEEE.802.15.3a,the S-Rake and P-Rake are employed in the systems.The simulation results show that the performance of DS-UWB system is better than that of TH-UWB system in multi-user environment.Also,it introduces that the performance in TH-UWB becomes worse with increasing the number of frames,and the performance in DS-UWB becomes better with increase in number of chips.The simulation is done for several numbers of fingers by S-Rake and P-Rake for Direct Sequence and Time hopping.The performances of the two systems become better with increase in number of fingers,and the performances of them become better by S-Rake than by P-Rake.