码片占空因子对DS-UWB系统的影响  

Impact of Chip Duty Factor on DS-UWB System

作　　者：朱一欢[1] 颜彪[1] 王海洋[1] 张慧[1] 刘敏[1] 

机构地区：[1]扬州大学信息工程学院,江苏扬州225009

出　　处：《无线电通信技术》2008年第6期1-3,共3页Radio Communications Technology

基　　金：江苏省高校自然科学基础研究项目(07KJD510247)

摘　　要：由于超宽带系统与窄带系统频谱重叠,窄带信号不可避免会干扰超宽带系统,严重影响其性能。信道模型采用IEEE 802.15.3a工作组建议的标准UWB室内信道模型,并使用最大比例合并Rake接收机,系统地研究了在不同窄带信号干扰情况下,可变的码片占空因子对直接序列超宽带(DS-UWB)系统的性能影响,并进行了仿真。仿真结果表明,使用低的码片占空因子得到的超宽带信号,能有效抵抗窄带干扰和多径衰落,较大提高UWB系统误比特性能。As the frequency spectrum of UWB system is overlapped with that of narrowband system, the UWB system will be interfered inevitably by narrowband signal and its performance will be affected badly. The UWB indoor channel model proposed by IEEE 802.15.3a study group is used in this UWB system, and the MRC-Rake is employed in the system. The impact of chip duty factor （DF） on direct sequence ultra wideband （DS-UWB） system in the presence of different narrowband interference is investigated in this paper. And then the simulation is carried out. The simulation results show that the narrowband interference-and multipath fading can be reduced effectively by employing DS-UWB signals got by using low DF,and the bit error rate performance of UWB system is improved significantly.

关 键 词：码片占空因子 窄带干扰 直扩超宽带 超宽带信道模型 

分 类 号：TN911.4[电子电信—通信与信息系统]