基于降维原理的全双工射频域快速自干扰抑制算法研究

摘要

In a full-duplex transceiver,to calculate the variable attenuator and phase shifter parameters of the self-interference (SI) cancellation structure at the radio frequency (RF) domain was not a convex quadratic conic programming problem,which led to a slow convergence speed.To solve the problem,a quick SI cancellation algorithm based on dimension reduction was proposed.It transformed the estimation of the above two variables into that of the cross correlation of the received SI and the SI reference signals,to reduce the search dimension and iteration numbers of the optimization problem and improve the convergence speed of the SI cancellation at the RF domain.By analysis and simulation,compared to the existing adaptive SI cancellation algorithms at the RF domain,the proposed algorithm obtains the optimal values of the variable attenuator and phase shifter by two iterations,and then significantly improves the convergence speed of the SI cancellation at the RF domain.%针对同时同频全双工收发信机的射频域自干扰抑制,由于自干扰抑制结构中可调衰减器、移相器最优值的二维求解不是二次型结构的优化问题,导致射频域自干扰抑制收敛速度缓慢.针对这一问题,提出基于降维原理的射频域快速自干扰抑制算法,通过将上述二维求解转化为接收自干扰信号与自干扰参考信号互相关的一维求解,降低了优化问题的搜索维度和迭代次数,提高了射频域自干扰抑制的收敛速度.分析与仿真表明,与现有的全双工射频域自适应干扰抑制算法相比,所提算法只需2次迭代即可确定衰减器、移相器的最优值,显著提高了自干扰抑制的收敛速度.