基于二次差频的多频连续波测距方法研究

多频测距解模糊的实现方式通常有两种:二次差频和参差双频.二次差频测距具有原理简单、接收机和发射机设计相对容易等优点.本文对二次差频测距的基本原理进行了详细推导,并对正确解模糊对信噪比的要求给出了理论分析,最后通过仿真实验验证了该方法的有效性,为多频连续波测距雷达的设计提供了一定的理论依据.

Minimum Mutual Information Blind Equalization of Multi-Input-Multi-Output Fading Channel

Minimum mutual information blind equalizer for multi input multi output fading channel of array antenna system is proposed.Based on method of minimizing of mutual information and approximated generalized Gaussian distribution of equalized output signal,the equalizer changes its coefficients adaptively.This approach and minimum mutual information blind equalization that uses nonlinear transformation are compared.Simulation shows that this approach has much larger constellation distance,faster convergence rate and better BER performance compared with that using nonlinear transformation.