Proceedings of 2009 International Workshop on Information Security and Application (IWISA 2009) Qingdao, China, November 2122, 2009 Editors: Feng Gao and Xijun Zhu AP Catalog Number: APPROCCS09CN004 ISBN: 9789525726060 Page(s): 8689 

Frequency Domain Constant Modulus Algorithm Based on Fractionally Spaced Blind Equalizer Yecai Guo, Chao Yang, and Rengang Lin 
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Abstract 

Aiming at the disadvantages of large mean square error(MSE) and slow convergence rate of Constant Modulus Algorithm(CMA), a frequency domain constant modulus algorithm based on fractionally spaced blind equalizer(FSFCMA) is proposed. In this proposed algorithm, fractionally spaced blind equalizer is used to avoid the spectrum aliasing caused by the subsampling and decrease the MSE effectively, and FFT technique and overlapping retention algorithm is employed for realizing the frequency domain constant modulus algorithm to improve the convergence performance of equalizer and to reduce the computational complexity greatly. The FSFCMA has smaller MSE and faster convergence rate comparison with the constant modulus algorithm in time domain(TCMA) and constant modulus algorithm in time domain based on fractionally spaced blind equalizer(FSTCMA). The good performance was simulated using underwater acoustic channel. 

Index Terms 

constant modulus algorithm; fractionally spaced equalizer; FFT overlapping retention algorithm 

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