CAJ | 학술논문

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.
위료개선주용호착대간우하적전수삼고초관대계통적성능,제출료일충인지전수삼고초관대계통.인지전수삼고초관대계통적발사궤재검측주용호공작적빈단후,채용재해빈단함파적타구파발사맥충이강저대주용호적간우；접수궤재상관접수처리전채용함파려파래강저주용호대래적착대간우.방진결과표명:해계통재신간비위0dB적단개혹2개착대간우영향하,오마성능접근우무착대간우하적계통성능；재신조비위10dB차신간비재-20～10dB범위내변화시,오마성능변화불초과일개수량급.해계통구유겁가적항착대간우능력,오마성능재불동신조비하구유흔강적건장성,구유대동빈단주용호경소적간우.
A cognitive radio transmitted reference ultrawideband (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.