Design and analysis of spectral- and energy-efficient spatial modulation.

Irfan, Mohammad (2024). Design and analysis of spectral- and energy-efficient spatial modulation. Thèse. Québec, Université du Québec, Institut national de la recherche scientifique, Doctorat en télécommunications, 162 p.

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Résumé

3rd generation partnership project (3GPP) has started work on specifications for 5G-Advanced in the form of Release-18. Multi-antenna systems are envisioned as key for enabling various features and use-cases in 5G-Advanced and beyond. However, the existing multiple-input multiple-output (MIMO) systems have significant implementation limitations, including high energy consumption, inter-carrier interference (ICI), and inter-antenna synchronization (IAS) which causes large implementation, operational, and detection complexities. These issues arise due to the simultaneous activation of all transmit antennas for transmission. The aforementioned limitations are even more significant in massive MIMO implementations, which is a key towards realizing the service requirements of 5G-Advanced and beyond. The shortcomings of MIMO systems can be addressed to a good extent by adopting the recently developed concept, widely known as spatial modulation (SM). In contrast to the existing MIMO techniques, SM offers a good trade-off in terms of data-rate, energy efficiency, and complexity, which makes it attractive for many use-cases. This thesis aims at the design and modeling of data-rate and energy efficient SM techniques. This thesis can be broadly divided into two parts based on two major problems of SM. The low data-rate of SM as compared to the conventional spatial multiplexing (SMx) is one major issue. Secondly, reliability or bit error rate (BER) performance of SM is another major issue. The limited data-rate of SM arise due to the result of in-efficient modeling, whereas the reliability issues arise due to the antenna activation mechanism of SM. Specifically, Part 1 of this thesis includes two Chapter 2 and Chapter 3, which focus on data-rate enhancements. Part 2 of this thesis includes Chapter 4 and Chapter 5, which focus on enhancing the reliability performance of SM technique(s). The SM technique is a member of the broader index-modulation (IM) family. IM has found immense applications in various domain, including at the subcarrier level of orthogonal frequency division multiplexing (OFDM), at the symbol-level of a single carrier system, at the antenna level of a MIMO system and at the code level of direct sequence spread spectrum. The data-rate and reliability issues exist in all IM techniques. While the main focus of this thesis is SM, the solutions proposed here for data-rate enhancement in Part 1 and reliability enhancements in Part 2 are equally applicable to all IM techniques and is thoroughly highlighted throughout this thesis. Particularly, in Part I, Chapter 2 first systematically study the reasons behind low data-rate of IM techniques. Then, explicit design guidelines are proposed in order to enhance the data-rate and energy efficiency of IM techniques. Using both simulation results and theoretical analysis, it is shown that the proposed guidelines helps in enhancing the data-rate, energy efficiency and reliability performances of IM techniques. The guidelines proposed in Chapter 2 are extended for SM technique in Chapter 3 to show the superiority of SM technique over the existing MIMO techniques in terms of data-rate, energy efficiency, reliability, and complexity. Then in Part II, Chapter 4 study the problem of optimal antenna activation in SM techniques when channel state information (CSI) is not available at the transmitter of SM. It is shown that equiprobable antenna activation is an optimal strategy when CSI is not available at transmitter of SM. Moreover, a spacetime mapping method for enabling equiprobable antenna activation in SM techniques is developed in Chapter 4. Using simulations and theoretical analysis, it is shown that the proposed method can achieve reliability enhancements in SM techniques. Finally, Chapter 5 studies the antenna activation problem in SM techniques when CSI is available at transmitter of SM. In Chapter 5, it is shown that maximally irregular antenna activation is desirable. A simple method based on similarities among information bits is proposed in Chapter 5 to enable maximally irregular antenna activation. Using both simulation results and theoretical analysis, it is shown that use of the proposed irregular antenna activation in SM techniques can achieve higher reliability enhancements. In a nutshell, the solutions detailed in this thesis addresses two major limitations of SM technique, i.e., data-rate and reliability.

Type de document:	Thèse Thèse
Directeur de mémoire/thèse:	Aïssa, Sonia
Mots-clés libres:	S.O.
Centre:	Centre Énergie Matériaux Télécommunications
Date de dépôt:	28 nov. 2024 19:44
Dernière modification:	28 nov. 2024 19:44
URI:	https://espace.inrs.ca/id/eprint/16199

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