Capacity and information rates for multiple antenna wireless systems with multi-dimensional modulation
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Multiple-Input Multiple-Output (MIMO) systems have shown a great potential for increasing the data transmission rates in wireless communications. These systems are characterized by a high design flexibility which allows a wide variety of efficient signaling techniques and resource allocation methods. In this thesis, we consider the capacity and transmission rates for MIMO systems using various multi-dimensional space-time modulation formats. The latters refer to various allocations of orthogonal signal dimensions (or modulating waveforms) to transmit antennas. For a single-user system with a fixed transmit power, we investigate the most efficient allocations of power and signal dimensions to transmit antennas so that transmission rates can be maximized under different cases of channel state information at the transmitter (CSIT). In many situations, we show that using all the signal dimensions on all the transmit antennas yields the largest rates. An analysis of the capacity and transmission rates is also provided at low and high SNR, where the effect of the spatial channel parameters is pointed out. For a broadcast system, we consider the power and signal dimensions allocations not only for transmit antennas, but also among users. [...]%%%%Les systemes a entree multiple et sortie multiple permettent d’augmenter le debit de transmission de donnees dans les reseaux de communication sans fil. Ces systemes sont caracterises par une grande flexibilite de conception, ce qui leur permet d’accommoder une grande variete de techniques de signalisation et d’attribution de ressources. Dans cette these, nous considerons la capacite et les debits de transmission possibles pour les systemes a entree multiple et sortie multiple utilisant une variete de formats de modulation espacetemps multidimensionnelle. Ces formats correspondent a differentes manieres d’ attribuer les dimensions orthogonales du signal aux antennes de transmission. Pour un systeme ayant un seul usager et moyennant une puissance de transmission fixe, nous examinons comment attribuer la puissance et les dimensions du signal aux antennes de transmission, de maniere a maximiser les debits de transmission en tenant compte de 1’information sur l’etat du canal dont dispose le transmetteur. Dans plusieurs situations, nous demontrons qu’utiliser toutes les dimensions du signal sur chaque antenne de transmission permet d’atteindre de plus hauts debits de transmission. [...]