基于OFDM的CUWB系统抗窄带干扰  

The narrowband interference resistance of the OFDM-based CUWB system

作　　者：席志红[1] 葛心鹏[1] 

机构地区：[1]哈尔滨工程大学信息与通信工程学院,黑龙江哈尔滨150001

出　　处：《应用科技》2010年第11期22-25,共4页Applied Science and Technology

摘　　要：为解决超宽带信号与窄带信号之间的干扰问题,将认知无线电技术和OFDM(orthogonal frequency divi-sion multiplexing)调制技术有效地融合到超宽带发射系统中.通过对信道环境进行检测后,把检测信息反馈给发射机,通过发射机前端的自适应调节装置对相应的子载波进行关闭并在此基础上加入陷波滤波器,使得被改变的频谱处能达到足够大的衰减,以便能避开窄带信号的干扰,同时保证被衰减的频谱带宽在一定范围内,不影响原有信号的通信,实现更好的通信效果.To solve the interference between the UWB signal （uhra-wideband signal） and narrowband signal, the technologies of CR （cognitive radio） and OFDM （Orthogonal Frequency Division Multiplexing） modulation were effectively applied to the uhra-wideband launch system. After the testing of channel environment by the CR technology, the system fed back the testing information to the transmitter, shut off corresponding sub-cartier by the adaptive adjusting device in front of the transmitter and on the basis of this, added a notch filter to make the change of spectrum achieve attenuation large enough so as to avoid the narrowband interference, and in the meantime, kept the bandwidth of attenuated spectrum in a certain range and did not affect the original signal communication, so as to realize better communication effect.

关 键 词：超宽带 认知无线电 OFDM 窄带干扰 关闭子载波 陷波滤波器 

分 类 号：TN92[电子电信—通信与信息系统]