In this paper,it focuses on the interference between the UWB and devices using the Wireless Local Area Network(WLAN) based on IEEE IEEE 802.11a standard.At first,it presents a background for UWB and WLAN systems,and then it provides simulation results of an interferer's impact on the SIR of each system.The results indicate that a UWB interferer has minimal interference to the performance of IEEE 802.11a system in line of sight(LOS) scenarios, and IEEE 802.11a can maintain reliable communication.However,in t...