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It is a method of adaptive multi-modulus equalization for an equalizer. A cost from a cost function is calculated according to a Constant Modulus Algorithm (CMA). Equalizer coefficients are updated according to the cost, and modulus of each region is determined for a Multi-Modulus Algorithm (MMA). The equalizer is switched to use the MMA when the cost reaches a first threshold. The MMA comprises several stages determined by thresholds, and the number of regions increases in every stage. The cost is calculated according to the MMA and modulus of each region. The equalizer coefficients are updated according to the cost, and modulus of each region is determined for the subsequent stage of the MMA.
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