自适应干扰对消系统中的积分控制与低通控制

摘要

The time-domain characteristics of weights and errors in analog adaptive interference cancellation system with integral control and low-pass control are analyzed. Under low-pass control, which is different with integral control, the residual error is not zero. But the convergence speed of low-pass control is faster than that of integral control. The analysis of neglecting high frequency can not reflect the different damp characteristics and the calculations are approximate. Adjusting the time constant of low-pass filter instead of increasing the gain out of the low-pass filter can improve the interference cancellation ratio and maintain the 3dB bandwidth.%分析了模拟自适应干扰对消系统在积分控制和低通控制下，系统的权值和误差的时域特性。低通控制和积分控制不同，存在剩余误差，但收敛速度略快于积分控制。忽略高频项的分析不能反映系统的不同阻尼特性，计算结果也是近似的。通过调整低通时间常数而不是提高低通外的增益，可保证系统3dB带宽不变而提高干扰对消比。