Narrowband interference suppression in TR-UWB system based on cognitive radio theory  

基于认知无线电的传输参考超宽带系统窄带干扰抑制技术(英文)

作　　者：赵华[1] 殷奎喜[1] 邵建华[1] 

机构地区：[1]南京师范大学物理科学与技术学院,南京210046

出　　处：《Journal of Southeast University(English Edition)》2012年第3期272-275,共4页东南大学学报（英文版）

基　　金：The National Research and Development Program of China(863 Program)(No.2007AA12Z238);the Natural Science Foundation of Jiangsu Higher Education Institutions of China(No. 12KJD510008)

摘　　要：A cognitive radio transmitted reference ultra-wideband（CR-TR-UWB） system is proposed to improve the performance of TR-UWB systems with narrowband interference（NBI） from primary users（PU）.The transmitter of the CR-TR-UWB system detects the band of PU,and then sends prolate spheroidal wave functions（PSWF） pulses with the same limited band as PU＇s to reduce interference with PU.The receiver uses a notch filter before autocorrelation to eliminate NBI from PU.The simulation results show that the bit error rate（BER） performance of the CR-TR-UWB system is close to that of TR-UWB systems without NBI when the system is interfered by single or double NBIs with a signal to interference ratio（SIR） of 0 dB,and if the signal to noise ratio（SNR） is 10 dB and the SIR varies from-20 to 10 dB,BER performance varies no more than an order of magnitude.The system has excellent resistance to NBI,strong robustness BER performance at different SNRs,and smaller interference with the same frequency band PU.为了改善主用户窄带干扰下的传输参考超宽带系统的性能,提出了一种认知传输参考超宽带系统.认知传输参考超宽带系统的发射机在检测主用户工作的频段后,采用在该频段陷波的椭球波发射脉冲以降低对主用户的干扰;接收机在相关接收处理前采用陷波滤波来降低主用户带来的窄带干扰.仿真结果表明:该系统在信干比为0dB的单个或2个窄带干扰影响下,误码性能接近于无窄带干扰下的系统性能;在信噪比为10dB且信干比在-20～10dB范围内变化时,误码性能变化不超过一个数量级.该系统具有极佳的抗窄带干扰能力,误码性能在不同信噪比下具有很强的健壮性,具有对同频段主用户更小的干扰.

关 键 词：transmitted reference ultra-wideband（TR-UWB） cognitive radio narrowband interference prolate spheroidal wave function（PSWF） coexistence communication 

分 类 号：TN92[电子电信—通信与信息系统]