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Low-Complexity Soft Detection of QAM demapper for a MIMO System

Ali Haroun 1 Charbel Abdel Nour 2, 3 Matthieu Arzel 2, 3 Christophe Jego 1
Lab-STICC - Laboratoire des sciences et techniques de l'information, de la communication et de la connaissance
Abstract : MIMO systems exploit multi-path propagation to improve throughput and performance of digital communication systems. However, at the receiver side, the computation of Euclidean distances requires prohibitive computational complexity particularly when combined with a high-order constellation. Conventionally, it is necessary to calculate all the Euclidean distances to find the maximum likelihood solution. In this letter, we propose a novel approach based on the principle of conditioned detection combined with lattice-reduction techniques to estimate the closest point to the received symbol without the computation of all the Euclidean distances. Thanks to this approach, a reduction up to 95% of the required number of multiplications is achieved without any degradation in terms of performance by comparison with a conventional BP technique.
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Ali Haroun, Charbel Abdel Nour, Matthieu Arzel, Christophe Jego. Low-Complexity Soft Detection of QAM demapper for a MIMO System. IEEE Communications Letters, Institute of Electrical and Electronics Engineers, 2016, 20 (4), pp.732 - 735. ⟨10.1109/LCOMM.2016.2525722⟩. ⟨hal-01453396⟩



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