Decision Feedback Blind Equalization Algorithm Based on Orthogonal Wavelet Packet Transform
Chao Yang · Jisuanji fangzhen · 2010
For overcoming effect of the underwater acoustic channel on communication quality, orthogonal Wavelet Packet Transform based Decision Feedback blind Equalization algorithm (WPT-DFE) was proposed, on the basis of analyzing orthogonal wavelet packet transform theory and the feature of decision feedback blind equalization algorithm. In this proposed WPT-DFE algorithm, correlativity of signals is lowed by orthogonal wavelet packet transform and iterative formula of forwardback weight vectors is modified by using orthogonal wavelet packet transform. The proposed WPT-DFE algorithm outperforms orthogonal Wavelet Transform based Decision Feedback blind Equalization algorithm (WT-DFE) and traditional Decision Feedback blind Equalization algorithm based on Constant Modulus Algorithm (CMA-DFE) in convergent rate, tracking performance, and Mean Square Error (MSE). The efficiency of the proposed WPT-DFE algorithm is proved by computer simulation with underwater acoustic channels.