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Normalized sliding window constant modulus and decision-directed algorithms: a link between blind equalization and classical adaptive filtering

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2 Author(s)
Papadias, C.B. ; Inf. Syst. Lab., Stanford Univ., CA, USA ; Slock, D.T.M.

By minimizing a deterministic criterion of the constant modulus (CM) type or of the decision-directed (DD) type, we derive normalized stochastic gradient algorithms for blind linear equalization (BE) of QAM systems. These algorithms allow us to formulate CM and DD separation principles, which help obtain a whole family of CM or DD BE algorithms from classical adaptive filtering algorithms. We focus on the algorithms obtained by using the affine projection adaptive filtering algorithm (APA). Their increased convergence speed and ability to escape from local minima of their cost function make these algorithms very promising for BE applications

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Signal Processing, IEEE Transactions on  (Volume:45 ,  Issue: 1 )