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中文摘要：
针对单个超宽带设备导致的影响，利用物理层模型的于扰分析方法分析了5种不同超宽带系统对窄带码分多址系统的干扰．依据各个系统的物理特性，分别建立了多个系统的物理层模型．根据窄带码分多址系统的通信要求，通过实验仿真，得出了窄带码分多址系统工作频段（870-885MHz）的超宽带系统功率限制参考值是一63dBm／MHz，并在此基础上分析了多个超宽带设备同时存在时对窄带码分多址系统的干扰．这个结论可以为解决超宽带系统与窄带码分多址系统的共存提供一种解决方案．
英文摘要：
For the effect caused by single ultra-wideband （UWB）, a method based on physical layer model was used to analyze the potential interference for narrowband code division multiple access （N-CDMA） system. Depending on the physical characteristics of five different UWB systems and N-CDMA, the physical layer models of these systems were built. Based on the communication requirement of N-CDMA system, as well as on the simulation, the reference value of power limit for UWB was obtained. The result is no more than -63 dl3m/MHz in 870-885 MHz,and accordingly, the interference of many UWI3 devices on N-CDMA system also was analyzed. The conclusion may provide a solution to the coexistence between UWI5 and N-CDMA system.
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