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Dithered signed-error CMA: robust, computationally efficient blind adaptive equalization

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2 Author(s)
Schniter, P. ; Sch. of Electr. Eng., Cornell Univ., Ithaca, NY, USA ; Johnson, C.R.

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 modification of signed-error CMA, based on the judicious use of dither, that results in an algorithm with robustness properties closely resembling those of CMA. We establish the fundamental transient and steady-state properties of dithered signed-error CMA and compare them with those of CMA

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Signal Processing, IEEE Transactions on  (Volume:47 ,  Issue: 6 )