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              <p>In this paper, we introduce projection-based precoding to secure cell-free Massive MIMO systems. We derive three secure precoding based on the zero-forcing (ZF) precoder. The first one cancels the transmit signal in the undesired direction, the second one first secures the legitimate channel before ZF precoding, and the third one minimises the mean square error under secrecy constraints. With a revision of the usual definition of the secrecy rate, the simulation results show total suppression of the signal received by eavesdroppers, significantly improving secrecy without injection of artificial noise.</p>
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              <p>&lt;div&gt;&lt;p&gt;Dans cet article, nous proposons des précodages par projection pour sécuriser les transmissions massivement MIMO pour les communications non-cellulaires. Nous dérivons trois précodages sécurisés basés sur le précodeur zéro-forcing (ZF). Le premier annule le signal transmis dans la direction non-désirée, le second sécurise d'abord le canal légitime avant le précodage ZF, et le troisième, minimise l'érreur quadratique moyenne sous contrainte de sécurité. Avec une révision de la définition usuelle du débit secret (secrecy rate), les résultats de simulations confirment la suppression totale du signal reçu par l'utilisateur illégitime, améliorant significativement la sécurité sans injection de bruit artificiel.&lt;/p&gt;&lt;/div&gt;</p>
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