误差反馈的正交小波均衡器结构与算法研究

在基于离散正交小波变换的基础上，结合传统的判决反馈自适应均衡算法，提出一种基于误差反馈的离散正交小波判决反馈均衡器结构和算法。对前馈滤波器用一组规范正交小波及其对应的系数来表示，后馈滤波器包含了误差反馈和判决反馈。并在此基础上，给出了自适应均衡算法。谊算法的优点是将离散正交小波变换和误差反馈相结合，利用小波变换的去相关能力在小波域中通过归一化的最小均方误差算法来提高收敛速度，利用误差反馈来减小误差信号之间的自相关性，以获得更小的均方误差（MSE）和误码率。

Qrthogonal Wavelet Equalizer Using Error Feedback: Structure and Algorithm

The structure and algorithm of a discrete orthogonal wavelet decision feedback equalizer using error feeaoack were proposed. The feedforward filter was represented by a set of orthogonal wavelets and the corresponding coefficients. The feedback filter includes error feedback and decision feedback. In addition, the adaptation algorithm was also given. Since discrete orthogonal wavelet transform has a better decorrelation perfermance and is easily combined with error feedback. The convergence speed of the adaptation algorithm was improved by normalized least mean square algorithm in wavelet domain. Error feedback is capable of converging to a lower value of mean square error by reducing auto-correlation of error signal.