An Optimized Combination of Frequency Domain Adaptive Equalizers

Abstract:

In order to overcome the defects of the high computational loads and selecting the threshold of mean square error (MSE) for time domain decision-directed constant modulus blind equalization algorithm (DD+CMA), a frequency domain parallel decision multi-modulus blind equalization algorithm based on frequency domain MMA(FMMA) and frequency domain LMS (FLMS) algorithm is proposed. The proposed algorithm is composed of the FMMA and FLMS, and the FMMA and FLMS run automatically in soft switching parallel manner. In running process, it is not necessary to selecting the threshold of the MSE. Moreover, the computational loads can be reduced by circular convolution in the frequency domain signals instead of linear one of the time domain signals. Simulation results show that performance of the proposed algorithm outperforms the FLMS and the FMMA algorithm.

• Periodical: Applied Mechanics and Materials (Volumes 548-549)
• Pages: 766-770
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.548-549.766
• Online since: April 2014
• Authors: Ke Cheng Leng, Cheng Bie, Xi Gong, Ran Xu, Ye Cai Guo*
• Keywords: Frequency Domain Blind, Parallel Running Manner, Soft Switching, Threshold

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