Pulse or digital communications – Equalizers – Automatic
Reexamination Certificate
2005-06-07
2005-06-07
Ghebretinsae, Temesghen (Department: 2637)
Pulse or digital communications
Equalizers
Automatic
C708S323000
Reexamination Certificate
active
06904087
ABSTRACT:
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. The equalizer is switched to the subsequent stage of the MMA when the MMA cost function output reaches the threshold corresponding to the current stage. The steps are repeated until the cost reaches a preset value. Then, the number of regions and equalizer coefficients are fixed to equalize the input signal.
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Ghebretinsae Temesghen
Rabin & Berdo P.C.
Via Technologies Inc.
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