该文针对单路延迟对消系统不能有效解决多径信道的超短波无线电台共址干扰消除问题,给出了等间隔多路延迟正交合成的射频干扰对消方案,进而提出了新的衰减系数求解方法.在设定时间延迟范围和参考信号路数基础上,该方法通过迭代加权实时有效估计多路参考信号的相关矩阵,接收信号与参考信号的相关向量,进而求解维纳霍夫方程得到各路衰减系数,有效抑制多径信道的自干扰,克服了已有方法需同时调节幅度和相位,以及相关向量和相关矩阵估计精度低的不足.另外,理论分析了衰减系数的求解过程,并推导了自干扰对消比的闭合表达式.分析和仿真结果表明,该方法在一定延迟误差情况下,可获得90 dB以上的对消比,比已有方法提高了约9 dB,有效解决了多径信道的射频干扰对消问题.%The one delay tap cancellation system is weakly to suppress the co-site interference between the Very High Frequency (VHF) radios in multipath channel.To overcome this obstacle,a Radio Frequency (RF) interference cancellation scheme based on the multi-tap delay and orthogonal combination is presented,as well as a new solving attenuation coefficients method.Considering the fixed delay scale and the number of taps,this method accurately estimates the reference signal autocorrelation matrix and the cross-correlation vector between reference signals and received signal on the basis of instantaneous and iterative weighted averaging.The attenuation coefficients are achieved by solving Wiener-Hopf equation via the estimated autocorrelation matrix and cross-correlation vector.Compared with the existing approaches,this method does not need to adjust and control the amplitudes as well as the phases of reference signals simultaneously,and it improves the accuracy of estimating cross-correlation vector and autocorrelation matrix.In addition,the closed-form expression of self-interference cancellation ratio is derived through theoretically analyzing the attenuation coefficients solution.The analysis and simulation results show that the proposed method could obtain self-interference cancellation ratio of more than 90 dB,which is about 9 dB higher than the existing method.This study is significant for eliminating RF self-interference in multipath channel.
展开▼
