用LMS算法消除开关噪声对射频接收机的影响

针对DC-DC开关电源在为射频接收机供电时，引入过大的电源纹波噪声干扰问题，提出用LMS算法从基带消除纹波噪声干扰的解决方案。从纹波噪声建模出发，根据ZigBee标准利用Simulink仿真工具，搭建了带电源纹波噪声干扰的射频接收机仿真模型，并利用两级LMS算法调整的自适应滤波器，从基带消除纹波噪声干扰。仿真结果显示，在100 mV以下的纹波电压情况下，带LMS算法噪声消除的射频接收机系统仍能正常工作；超过100 mV后，算法能减小纹波噪声对射频接收机的干扰。

Elimination of the Influence of Switching Noise on RF Receiver by LMS Algorithms

For the application of the RF receiver with DC DC switch power supply, the LMS algorithm is proposed to eliminate the interference from the base band because of too large power ripple noise. Starting from the ripple noise modeling, according to the ZigBee standard, an RF receiver simulation model with ripple noise interference is built using Simulink. The adaptive filter based on the two stage LMS algorithm is used to eliminate the ripple noise from the baseband. The simulation results show that the RF receiver system with LMS algorithm noise elimination can work normally at ripple voltages less than 100 mV, and that the LMS algorithm can reduce the interference of the ripple noise to the RF receiver at voltages greater than 100 mV.