TO APPEAR IN IEEE TRANSACTIONS ON SIGNAL PROCESSING 1 Dithered Signed - Error CMA : Robust , Computationally E cientBlind Adaptive Equalization

Adaptive blind equalization has gained widespread use in communication systems that operate without training signals. In particular, the Constant Modulus Algorithm (CMA) has become a favorite of practitioners due to its LMS-like complexity and desirable robustness properties. The desire for further reduction in computational complexity has motivated signed-error versions of CMA, which have been found to lack the robustness properties of CMA. This paper presents a simple modi cation of signederror CMA, based on the judicious use of dither, that results in an algorithm with robustness properties closely resembling those of CMA. In this paper, we establish the fundamental transient and steady-state properties of dithered signed-error CMA and compare them to those of CMA.