Computationally efficient blind equalization based on digital watermarking

A blind equalization method based on digital watermarking is presented. A chunk of data is selected from the data to be transmitted. This chunk of data is hidden in the entire data using digital watermarking. For watermarking, DS-CDMA based spread spectrum watermarking scheme is used. On receiving side, watermark is extracted from the watermarked data. With the help of received chunk of data and the extracted watermark, which is actually extracted version of the selected chunk of data, the channel is equalized by using Normalized LMS algorithm. In this method, neither receiver requires to know the training sequence in advance nor the sender requires to send training sequence. Proposed algorithm can simultaneously be used for usual watermarking applications and blind equalization.