CAJ | 학술논문

针对直接序列扩频通信系统中的时变单音干扰，提出了一种频域干扰估计时域对消的新方法。在系统中，将干扰信道建模为时变衰落信道。该算法首先在频域对时变单音干扰信号参数进行估计，然后对时变单音干扰进行重构和对消，推导了理论误码率公式。理论分析和仿真结果表明，该算法性能由干扰功率和多普勒频移等因素决定。在频率选择性衰落信道下，当信噪比为20dB，扩频增益为16，干扰信道多普勒频移为100Hz时，该算法可以抑制20dB（干信比）的单音干扰。
침대직접서렬확빈통신계통중적시변단음간우，제출료일충빈역간우고계시역대소적신방법。재계통중，장간우신도건모위시변쇠락신도。해산법수선재빈역대시변단음간우신호삼수진행고계，연후대시변단음간우진행중구화대소，추도료이론오마솔공식。이론분석화방진결과표명，해산법성능유간우공솔화다보륵빈이등인소결정。재빈솔선택성쇠락신도하，당신조비위20dB，확빈증익위16，간우신도다보륵빈이위100Hz시，해산법가이억제20dB（간신비）적단음간우。
In this paper,a frequency domain interference estimation and time domain cancellation method is proposed to suppress the time-varying single tone jamming (STJ)in direct sequence spread spectrum (DSSS)system.The interference channel is modeled as a time-varying fading channel in the system.In this method,the parameters of time-varying STJ are estimated in frequency domain,and then it is reconstructed and subtracted from the raw data.Furthermore,the BER ex-pression is analyzed to assess the performance of the proposed method.Simulation results demonstrate the effectiveness of the method in mitigating time-varying STJ and approaching the interference-free performance limit over practical ranges of STJ power levels and mobility levels.In the frequency selective fading channel,when signal-to-noise ratio (SNR)is 20 dB,the spreading gain is 16,Doppler shift of the interference channel is 100 Hz,jamming-to-signal power ratio (JSR)is less than 20 dB,the STJ can be suppressed by the proposed method.