Comparison of hybrid adaptive blind equalizers for QAM signals
Abdenour Labed, Adel Belouchrani, Abdeldjalil Aïssa El Bey, Thierry Chonavel · Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE · 2009
This paper compares different hybrid blind equalization algorithms used for QAM signals. In hybrid equalizers, a penalty term, with zeros at constellation points coordinates, called constellation matching error (CME) is added to the criterion of one of the standard algorithms, such as the constant modulus algorithm (CMA), the multimodulus algorithm (MMA) or the recently proposed extended constant modulus algorithm (ECMA). Among the CMEs, to be considered, we have recently introduced a new one which is the product of l1-norm of the deviations of equalizer output from the constellation points. The hybrid algorithms, obtained by combining different CMEs with the CMA or the ECMA are compared through simulations on 16-QAM, 64-QAM and 256-QAM signals transmitted over different channels.