Blind Equalization Using the Constant ModulusCriterion : A
نویسندگان
چکیده
This paper provides a tutorial introduction to the constant modulus (CM) criterion for blind fractionally-spaced equalizer (FSE) design via a (stochastic) gradient descent algorithm such as the Constant Mod-ulus Algorithm. The topical divisions utilized in this tutorial can be used to help catalog the emerging literature on the CM criterion and on the behavior of (stochastic) gradient descent algorithms used to minimize it.
منابع مشابه
On the Blind Equalization of Continuous Phase Modulated Signals Using a Constant Modulus Criterion
The use of a constant modulus (CM) criterion to achieve blind equalization of Continuous Phase Modulated signals is investigated in this paper. A characterization of the solutions is provided. It is shown that the constant modulus criterion may be, theoretically, unsuccessful because of the existence of undesired solutions.
متن کاملBlind equalization of constant modulus signals via restricted convex optimization
In this paper, we formulate the blind equalization of Constant Modulus (CM) signals as a convex optimization problem. This is done by performing an algebraic transformation on the direct formulation of the equalization problem and then restricting the set of design variables to a subset of the original feasible set. In particular, we express the blind equalization problem as a linear objective ...
متن کاملBlind equalization of constant modulus signals via support vector regression
In this paper the problem of blind equalization of constant modulus (CM) signals is formulated within the support vector (SV) regression framework. The quadratic inequalities derived from the CM property are transformed into linear ones, thus yielding a quadratic programming (QP) problem. Then an iterative reweighted procedure is proposed to blindly restore the CM property. The technique can be...
متن کاملA Novel Variable Step Size Adjustment Method Based on Autocorrelation of Error Signal for the Constant Modulus Blind Equalization Algorithm
Blind equalization is a technique for adaptive equalization of a communication channel without the use of training sequence. Although the constant modulus algorithm (CMA) is one of the most popular adaptive blind equalization algorithms, because of using fixed step size it suffers from slow convergence rate. A novel enhanced variable step size CMA algorithm (VSS-CMA) based on autocorrelation of...
متن کاملFractionally spaced blind equalization with low-complexity concurrent constant modulus algorithm and soft decision-directed scheme
The paper proposes a low-complexity concurrent constant modulus algorithm (CMA) and soft decisiondirected (SDD) scheme for fractionally spaced blind equalization of high-order quadrature amplitude modulation channels. We compare our proposed blind equalizer with the recently introduced state-of-art concurrent CMA and decision-directed (DD) scheme. The proposed CMA+SDD blind equalizer is shown t...
متن کامل