Nonlinear signal processing and its applications to telecommunications
Abstract
This dissertation is primarily concerned with the estimation of nonlinear communication systems that are modeled by Volterra series. The major methods used for estimating the unknown channel parameters can be classified into: training-based and blind. Training-based parameter estimation is in general a nontrivial task because the Volterra operators are not orthogonal. On the other hand, blind channel estimation is in general hard, because the output statistics depend nonlinearly on the parameters. A main consideration of all Volterra parameter estimation methods is over-parametrization. Therefore, there is a strong need to decrease the parameter space by only considering those parameters that actually contribute to the output. First, orthobasis representation and training-based identification through the respective Fourier series are investigated. Next, higher order statistics are used for the blind identification of nonlinear channels. The proposed algorithms for blind nonlinear chann ...
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