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Abstract
This paper presents an efficient Semi-Blind (SB) approach for demixing multi-user mixtures, in a Multiple-Input Multiple-Output Orthogonal Frequency Division Multiplexing (MIMO-OFDM) communications system. A weighted hybrid cost function is introduced based upon the Multi-Modulus (MM) criterion, applied to unknown data, and the Least Squares (LS) criterion for pilot symbols. A separation procedure is put forward based on a block gradient descent approach, in which the step size is algebraically computed at each iteration and for each user. Besides a reduced computational complexity and an accelerated convergence, simulation results show that the proposed approach allows to mitigate the inherent ambiguity of fully-blind methods, and to withstand to the pilot contamination problem in massive MIMO systems.
Keywords
Semi-blind source separation; Multi-modulus; MIMO-OFDM; Least squares; Least fourth
Speaker
Ouahbi Rekik
Universit?Paris 13 Sorbonne Paris Cit?& L2TI, Institut Galil閑, France
Submission Author
Ouahbi RekikUniversit?Paris 13 Sorbonne Paris Cit?& L2TI, Institut Galil閑, France
Karim Abed-MeraimUniversity of Orleans & PRISME Lab., France
Anissa MokraouiUniversit?Paris 13, Sorbone Paris Cit?& Institut Galil閑, L2TI, France
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