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Dissertations / Theses on the topic 'Massives MIMO'

Author: Grafiati

Published: 23 September 2022

Last updated: 31 July 2025

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1

Ladaycia, Abdelhamid. "Annulation d’interférences dans les systèmes MIMO et MIMO massifs (Massive MIMO)." Thesis, Sorbonne Paris Cité, 2019. http://www.theses.fr/2019USPCD037.

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Les systèmes de communications MIMO utilisent des réseaux de capteurs qui peuvent s’étendre à de grandes dimensions (MIMO massifs) et qui sont pressentis comme solution potentielle pour les futurs standards de communications à très hauts débits. Un des problème majeur de ces systèmes est le fort niveau d’interférences dû au grand nombre d’émetteurs simultanés. Dans un tel contexte, les solutions ’classiques’ de conception de pilotes ’orthogonaux’ sont extrêmement coûteuses en débit utile permettant ainsi aux solutions d’identification de canal dites ’aveugles’ou ’semi-aveugles’ de revenir au-d

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2

Karlsson, Marcus. "Aspects of Massive MIMO." Licentiate thesis, Linköpings universitet, Kommunikationssystem, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-132718.

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Next generation cellular wireless technology faces tough demands: increasing the throughput and reliability without consuming more resources, be it spectrum or energy. Massive mimo (Multiple-Input Multiple-Output) has proven, both in theory and practice, that it is up for the challenge. Massive mimo can offer uniformly good service to many users using low-end hardware, simultaneously, without increasing the radiated power compared to contemporary system. In Massive mimo, the base stations are equipped with hundreds of antennas. This abundance of antennas brings many new, interesting aspects co

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3

Becirovic, Ema. "On Massive MIMO for Massive Machine-Type Communications." Licentiate thesis, Linköpings universitet, Kommunikationssystem, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-162586.

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To cover all the needs and requirements of mobile networks in the future, the predicted usage of the mobile networks has been split into three use-cases: enhanced mobile broadband, ultra-reliable low-latency communication, and massive machine-type communication. In this thesis we focus on the massive machine-type communication use-case which is intended to facilitate the ever increasing number of smart devices and sensors. In the massive machine-type communication use-case, the main challenges are to accommodate a huge number of devices while keeping the battery lives of the devices long, and

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4

Wannas, Hussain. "Full Duplex Multiuser MIMO with Massive Arrays." Thesis, Linköpings universitet, Institutionen för systemteknik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-105268.

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Half-Duplex Multiuser Multiple-Input Multiple-Output (HD MU-MIMO) systemscurrently employed in communication systems are not experiencing the selfinterference(SI) problem but they are not optimal in terms of efficiency and interms of resources used (time and frequency resources). Ignoring the effect of largescalefading, we start by explaining the uplink (UL) and downlink (DL) parts ofthe MU-MIMO system and how the sum-rate is calculated. We also introduce thethree linear receivers/precoders, Maximum-Ratio Combining (MRC)/Maximum-Ratio Transmission (MRT), Zero-Forcing (ZF), and Minimum Mean-Squ

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5

Alnajjar, Khawla. "Receiver Design for Massive MIMO." Thesis, University of Canterbury. Electrical and Computer Engineering, 2015. http://hdl.handle.net/10092/10517.

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Massive multiple-input-multiple-output (MM) is becoming a promising candidate for wireless communications. The idea behind MM is to use a very large number of antennas to increase throughput and energy efficiency by one or more orders of magnitude. In order to make MM feasible, many challenges remain. In the uplink a fundamental question is whether to deploy single massive arrays or to build a virtual array using cooperative base stations. Also, in such large arrays the signal processing involved in receiver combining is non-trivial. Therefore, low complexity receiver designs and deployment sc

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6

Ajayi, Idowu Iseoluwa. "Enhanced Physical Layer Security through Frequency and Spatial Diversity." Electronic Thesis or Diss., Sorbonne université, 2023. http://www.theses.fr/2023SORUS227.

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La sécurité de la couche physique (PLS) est un paradigme émergent qui se concentre sur l'utilisation des propriétés de la communication sans fil, telles que le bruit, l'évanouissement, la dispersion, l'interférence, la diversité, etc. pour assurer la sécurité entre les utilisateurs légitimes en présence d'un espion. Comme le PLS utilise des techniques de traitement du signal et de codage, il intervient au niveau de la couche physique et peut donc garantir le secret quelle que soit la puissance de calcul de l'espion. Cela en fait une approche intéressante pour compléter la cryptographie traditi

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7

Negrão, João Lucas. "Efficient detection : from conventional Mimo to massive Mimo communication systems." Universidade Estadual de Londrina. Centro de Tecnologia e Urbanismo. Programa de Pós-Graduação em Engenharia Elétrica, 2018. http://www.bibliotecadigital.uel.br/document/?code=vtls000218370.

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Ao longo deste trabalho, problemas relacionados aos sistemas de comunicação equipados com múltiplas antenas no transmissor e receptor (MIMO - Multiple- Input Multiple-Output) são analisados sob o ponto de vista de detecção clássica, da otimização não-linear, bem como da pré-codificação linear, desde MIMO convencional (algumas antenas no Tx e Rx) até sistemas MIMO de larga-escala (massivo). Inicialmente, a eficiência de detecção de vários detectores MIMO foi analisada sob a prerrogativa de canais altamente correlacionados, situação em que sistemas MIMO apresentam elevada perda de desempenho, al

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8

ORTEGA, ALVARO JAVIER. "SIGNAL DETECTION IN MASSIVE MIMO SYSTEMS." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2015. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=26176@1.

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PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO<br>CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO<br>FUNDAÇÃO DE APOIO À PESQUISA DO ESTADO DO RIO DE JANEIRO<br>Este trabalho de dissertação de mestrado apresenta uma comparação de algumas das técnicas de detecção de sinais mais promissoras para a viabilização de sistemas MIMO de grande porte em termos de desempenho, taxa de erro de bit e complexidade, número médio de flops requeridos por vetor de símbolos recebido. Com este objetivo foram também consideradas as técnicas de detecção clássicas, visando assim ressaltar o desempen

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9

Payami, Sohail. "Hybrid beamforming for massive MIMO systems." Thesis, University of Surrey, 2017. http://epubs.surrey.ac.uk/842311/.

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Massive multiple-input multiple-output (MIMO) technology is considered as one of the enabling technologies to scale up the data rates for the future communication systems. Traditional MIMO systems employ digital beamforming where each antenna element is equipped with one radio frequency (RF) chain. When the number of the antennas are scaled up, the cost and power consumption of massive MIMO systems also increase significantly. Recently, hybrid analog-and-digital beamformers have attracted a lot of attention as a cost effective approach to benefit from the advantages of massive MIMO. In hybrid

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10

Ngo, Hien Quoc. "Massive MIMO: Fundamentals and System Designs." Doctoral thesis, Linköpings universitet, Kommunikationssystem, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-112780.

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The last ten years have seen a massive growth in the number of connected wireless devices. Billions of devices are connected and managed by wireless networks. At the same time, each device needs a high throughput to support applications such as voice, real-time video, movies, and games. Demands for wireless throughput and the number of wireless devices will always increase. In addition, there is a growing concern about energy consumption of wireless communication systems. Thus, future wireless systems have to satisfy three main requirements: i) having a high throughput; ii) simultaneously serv

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11

Yao, Xuefeng. "Performance analysis of massive MIMO networks." Thesis, The University of Sydney, 2018. http://hdl.handle.net/2123/18847.

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Mobile data tra_c is predicted to grow 1000x from now until 2030 [1, 2], and dense small cell networks (SCNs) and massive multiple input multiple output (mMIMO) are considered the major pilar technologies to meet this ever-increasing capacity demand in the years to come. Dense SCNs which is comprised of picocells, femtocells, metrocells, etc are considered to be one of the main approaches to signi_cantly increase the network capacity and meet the capacity demand in 5G network. Indeed, the orthogonal deployment of SCNs with existing macrocells has already been applied as one solution in 4thgene

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12

Mursia, Placido. "Multi-antenna methods for scalable beyond-5G access networks." Electronic Thesis or Diss., Sorbonne université, 2021. http://www.theses.fr/2021SORUS532.

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L’augmentation exponentielle des équipements d’utilisateurs sans fil (UEs) et des services des réseaux associés aux déploiements actuels de cinquième génération (5G) pose plusieurs défis de conception sans précédent qui doivent être résolus avec l’avènement des futurs réseaux au-delà de la 5G. Plus précisément, la demande croissante de débits de données élevés ainsi que la nécessité de desservir un grand nombre d’appareils hétérogènes, allant des téléphones mobiles classiques aux objets connectés formant l’internet des objets (IoT), motivent l’étude de nouveaux schémas de traitement et de tran

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13

Sörman, Simon. "System Information Distribution in Massive MIMO Systems." Thesis, Linköpings universitet, Kommunikationssystem, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-129294.

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The 5th generation mobile telecommunication system (5G) is currently being specified and developed, with large expectations on throughput and efficiency. While 4G and more specifically LTE might constitute a basis of the design of the network, there are some parts that should be improved. One thing to improve is the static signalling that occurs very frequently in a 4G network, of which system information such as synchronization signals, detection of network frequencies, operators, configurations etc. is a part. It has been shown that the static signalling requires both much energy and time-fr

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14

Zhu, Jun. "Physical layer security in massive MIMO systems." Thesis, University of British Columbia, 2016. http://hdl.handle.net/2429/58281.

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Massive multiple-input multiple-output (MIMO) is one of the key technologies for the emerging fifth generation (5G) wireless networks, and has the potential to tremendously improve spectral and energy efficiency with low-cost implementations. While massive MIMO systems have drawn great attention from both academia and industry, few efforts have been made on how the richness of the spatial dimensions offered by massive MIMO affects wireless security. As security is crucial in all wireless systems due to the broadcast nature of the wireless medium, in this thesis, we study how massive MIMO techn

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15

Hburi, Ismail Sh Baqer. "Asymptotic performance of multiuser massive MIMO systems." Thesis, Brunel University, 2017. http://bura.brunel.ac.uk/handle/2438/15790.

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This thesis addresses and identifies outstanding challenges associated with the Multi user massive Multiple-Input Multiple-Output (MU massive MIMO) transmission, whereby various system scenarios have been considered to tackle these challenges. First, for a single cell scenario, the uplink effective capacity under statistical exponent constraints, the asymptotic error and outage probabilities in a multi user massive MIMO system are provided. The proposed approach establishes closed form expressions for the aforementioned metrics under both perfect and imperfect channel state information (CSI) s

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16

Husbands, Ryan R. "Transmit antenna selection for multiuser massive MIMO." Thesis, University of Kent, 2018. https://kar.kent.ac.uk/69467/.

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In massive multiple input multiple output (MIMO) systems, major challenges are present due to the large number of active antennas and radio frequency (RF) chains,suchasincreasedpowerconsumptionandcomputationcomplexity. Transmitantennaselection(TAS)isbeinginvestigatedasasolutiontotacklethesechallenges. In this thesis, a dynamic transmit antenna selection technique is proposed whichcanmaximizethesumrateofamultiuser(MU)-MIMOcommunicationsystem. In order to satisfy the objective, the number of transmit antennas required is determined by remodeling it as a binary Knapsack Problem (KP) and then exte

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17

Parida, Priyabrata. "Stochastic Geometry Perspective of Massive MIMO Systems." Diss., Virginia Tech, 2021. http://hdl.handle.net/10919/105089.

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Owing to its ability to improve both spectral and energy efficiency of wireless networks, massive multiple-input multiple-output (mMIMO) has become one of the key enablers of the fifth-generation (5G) and beyond communication systems. For successful integration of this promising physical layer technique in the upcoming cellular standards, it is essential to have a comprehensive understanding of its network-level performance. Over the last decade, stochastic geometry has been instrumental in obtaining useful system design insights of wireless networks through accurate and tractable theoretical

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18

Khani, Shirkoohi Mehrdad. "Adaptive Neural Signal Detection for Massive MIMO." Thesis, Massachusetts Institute of Technology, 2019. https://hdl.handle.net/1721.1/122549.

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Thesis: S.M. in Computer Science and Engineering, Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2019<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 55-58).<br>Massive Multiple-Input Multiple-Output (MIMO) is a key enabler for fifth generation (5G) cellular communication systems. Massive MIMO gives rise to challenging signal detection problems for which traditional detectors are either impractical or suffer from performance limitations. Recent work has proposed several learning approaches to MIMO detecti

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19

Ghazanfari, Amin. "Power Control for Multi-Cell Massive MIMO." Licentiate thesis, Linköpings universitet, Kommunikationssystem, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-160782.

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The cellular network operators have witnessed significant growth in data traffic in the past few decades. This growth occurs due to the increases in the number of connected mobile devices, and further, the emerging mobile applications developed for rendering video-based on-demand services. As the frequency bandwidth for cellular communication is limited, significant effort was dedicated to improve the utilization of the available spectrum and increase the system performance via new technologies. For example, 3G and 4G networks were designed to facilitate high data traffic in cellular networks

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20

Guo, Jiabing. "Design and implementation of LTE-A and 5G kernel algorithms on SIMD vector processor." Thesis, KTH, Radio Systems Laboratory (RS Lab), 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-159474.

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With the wide spread of wireless technology, the time for 4G has arrived, and 5G will appear not so far in the future. However, no matter whether it is 4G or 5G, low latency is a mandatory requirement for baseband processing at base stations for modern cellular standards. In particular, in a future 5G wireless system, with massive MIMO and ultra-dense cells, the demand for low round trip latency between the mobile device and the base station requires a baseband processing delay of 1 ms. This is 10 percentage of today’s LTE-A round trip latency, while at the same time massive MIMO requires larg

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21

Khojastehnia, Mahdi. "Massive MIMO Channels Under the Joint Power Constraints." Thesis, Université d'Ottawa / University of Ottawa, 2019. http://hdl.handle.net/10393/39992.

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Massive MIMO has been recognized as a key technology for 5G systems due to its high spectral efficiency. The capacity and optimal signaling for a MIMO channel under the total power constraint (TPC) are well-known and can be obtained by the water-filling (WF) procedure. However, much less is known about optimal signaling under the per-antenna power constraint constraint (PAC) or under the joint power constraints (TPC+PAC). In this thesis, we consider a massive MIMO Gaussian channel under favorable propagation (FP) and obtain the optimal transmit covariance under the joint constraints. The effec

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22

Peken, Ture, Ravi Tandon, and Tamal Bose. "ELASTIC NET FOR CHANNEL ESTIMATION IN MASSIVE MIMO." International Foundation for Telemetering, 2017. http://hdl.handle.net/10150/626998.

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Next generation wireless systems will support higher data rates, improved spectral eﬃciency, and less latency. Massive multiple-input multiple-output (MIMO) is proposed to satisfy these demands. In massive MIMO, many beneﬁts come from employing hundreds of antennas at the base station (BS) and serving dozens of user terminals (UTs) per cell. As the number of antennas increases at the BS, the channel becomes sparse. By exploiting sparse channel in massive MIMO, compressive sensing (CS) methods can be implemented to estimate the channel. In CS methods, the length of pilot sequences can be shorte

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23

Huang, Qinhui. "Lattice network coding in distributed massive MIMO systems." Thesis, University of York, 2017. http://etheses.whiterose.ac.uk/18826/.

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In this thesis, the uplink of distributed massive MIMO where a large number of distributed access point antennas simultaneously serve a relatively smaller number of users is considered. Lattice network coding (LNC), which comprises compute and forward (C&F) and integer forcing (IF), is employed to avoid the potentially enormous backhaul load. Firstly, novel algorithms for coefficient selection in C&F are proposed. For the first time, we propose a low polynomial complexity algorithm to find the optimal solution for the complex valued case. Then we propose a sub-optimal simple linear search algo

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24

Yammine, George [Verfasser]. "Noncoherent detection in massive MIMO systems / George Yammine." Ulm : Universität Ulm, 2021. http://d-nb.info/1227450699/34.

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25

Pitarokoilis, Antonios. "Phase Noise and Wideband Transmission in Massive MIMO." Doctoral thesis, Linköpings universitet, Kommunikationssystem, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-127399.

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In the last decades the world has experienced a massive growth in the demand for wireless services. The recent popularity of hand-held devices with data exchange capabilities over wireless networks, such as smartphones and tablets, increased the wireless data traffic even further. This trend is not expected to cease in the foreseeable future. In fact, it is expected to accelerate as everyday apparatus unrelated with data communications, such as vehicles or household devices, are foreseen to be equipped with wireless communication capabilities. Further, the next generation wireless networks sho

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Chataut, Robin. "Optimization of Massive MIMO Systems for 5G Networks." Thesis, University of North Texas, 2020. https://digital.library.unt.edu/ark:/67531/metadc1707262/.

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In the first part of the dissertation, we provide an extensive overview of sub-6 GHz wireless access technology known as massive multiple-input multiple-output (MIMO) systems, highlighting its benefits, deployment challenges, and the key enabling technologies envisaged for 5G networks. We investigate the fundamental issues that degrade the performance of massive MIMO systems such as pilot contamination, precoding, user scheduling, and signal detection. In the second part, we optimize the performance of the massive MIMO system by proposing several algorithms, system designs, and hardware archit

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Interdonato, Giovanni. "Signal Processing Aspects of Cell-Free Massive MIMO." Licentiate thesis, Linköpings universitet, Kommunikationssystem, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-151026.

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The fifth generation of mobile communication systems (5G) promises unprecedented levels of connectivity and quality of service (QoS) to satisfy the incessant growth in the number of mobile smart devices and the huge increase in data demand. One of the primary ways 5G network technology will be accomplished is through network densification, namely increasing the number of antennas per site and deploying smaller and smaller cells. Massive MIMO, where MIMO stands for multiple-input multiple-output, is widely expected to be a key enabler of 5G. This technology leverages an aggressive spatial multi

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Wickrama, Arachchi C. (Chamalee). "Optimization techniques for cell-free massive MIMO system." Master's thesis, University of Oulu, 2019. http://jultika.oulu.fi/Record/nbnfioulu-201909072849.

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Abstract. The problem of max-min signal-to-interference plus noise ratio (SINR) for uplink transmission of cell-free massive multiple-input multiple-output (MIMO) system is considered. We assume that the system is employed with local minimum mean square error (L-MMSE) detection. The objective is to preserve user fairness by solving max-min rate optimization problem, by optimizing transmit power of each user equipment (UE) and weighting coefficients at central processing unit (CPU), subject to a transmit power constraint at each UE. This problem is not jointly convex. Hence, we decompose origin

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Fu, Wenjun. "From the conventional MIMO to massive MIMO systems : performance analysis and energy efficiency optimization." Thesis, University of Edinburgh, 2017. http://hdl.handle.net/1842/25672.

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The main topic of this thesis is based on multiple-input multiple-output (MIMO) wireless communications, which is a novel technology that has attracted great interest in the last twenty years. Conventional MIMO systems using up to eight antennas play a vital role in the urban cellular network, where the deployment of multiple antennas have significantly enhanced the throughput without taking extra spectrum or power resources. The massive MIMO systems “scales” up the benefits that offered by the conventional MIMO systems. Using sixty four or more antennas at the BS not only improves the spectru

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Pakdeejit, Eakkamol. "Linear Precoding Performance of Massive MU-MIMO downlink System." Thesis, Linköpings universitet, Kommunikationssystem, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-94225.

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Nowadays, multiuser Multiple-In Multiple-Out systems (MU-MIMO) are used in a new generation wireless technologies. Due to that wireless technology improvement is ongoing, the numbers of users and applications increase rapidly. Then, wireless communications need the high data rate and link reliability at the same time. Therefore, MU-MIMO improvements have to consider 1) providing the high data rate and link reliability, 2) support all users in the same time and frequency resource, and 3) using low power consumption. In practice, the interuser interference has a strong impact when more users acc

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Xu, Zitong. "M-MIMO Map Based Positioning in Wireless Networks." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-291444.

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The next generation 5G systems has attracted more and more attention to the rapid development of information and communication technology (ICT). Positioning is an important research area in 5G mobile networks, especially in M-MIMO wireless networks. Because the base station needs to have a knowledge of the position of the user equipment, which can direct the signal to the user equipment while reducing interference and hence improve the user throughput. But the problem is that it is difficult to determine position when users are in NLOS scenarios. In the master thesis, we conclude the existing

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Tabikh, Wassim. "Massive MIMO in 5G networks for intercell interference cancellation and capacity boost." Thesis, Paris, ENST, 2018. http://www.theses.fr/2018ENST0012/document.

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L’évolution des communications sans fil doit répondre à la croissance exponentielle de la consommation de données. On prévoit une augmentation du débit allant jusqu’à 1000 d’ici 2020. Cependant, pour atteindre ce but, plusieurs ingrédients sont essentiels. La limitation majeure des systèmes sans fil est l’interférence à cause de la réutilisation des fréquences. C'est un problème qui existait depuis toujours et notamment à partir de la 3G. On croit que ce problème sera notamment plus grave dans la 5G, et cela à cause de la densification prévue des réseaux. L’utilisation de l’OFDM en 4G a mené à

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Gülgün, Ziya. "Physical Layer Security Issues in Massive MIMO and GNSS." Licentiate thesis, Linköpings universitet, Kommunikationssystem, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-172558.

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Wireless communication technology has evolved rapidly during the last 20 years. Nowadays, there are huge networks providing communication infrastructures to not only people but also to machines, such as unmanned air and ground vehicles, cars, household appliances and so on. There is no doubt that new wireless communication technologies must be developed, that support the data traffic in these emerging, large networks. While developing these technologies, it is also important to investigate the vulnerability of these technologies to different malicious attacks. In particular, spoofing and jammi

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Wu, Shangbin. "Massive MIMO channel modelling for 5G wireless communication systems." Thesis, Heriot-Watt University, 2015. http://hdl.handle.net/10399/2889.

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Massive Multiple-Input Multiple-Output (MIMO) wireless communication systems, equipped with tens or even hundreds of antennas, emerge as a promising technology for the Fifth Generation (5G) wireless communication networks. To design and evaluate the performance of massive MIMO wireless communication systems, it is essential to develop accurate, flexible, and efficient channel models which fully reflect the characteristics of massive MIMO channels. In this thesis, four massive MIMO channel models have been proposed. First, a novel non-stationary wideband multi-confocal ellipse Two-Dimensional (

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Alluhaibi, Osama. "Hybrid precoding algorithms for millimeter-wave massive MIMO systems." Thesis, University of Kent, 2018. https://kar.kent.ac.uk/67007/.

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The large available spectrum efficiency and wider bandwidth at millimeter wave (mm-Wave) frequencies can enable the gigabit-per-second data rates needed for next generation wireless systems. To compensate for the high propagation loss at mm-Wave bands, multiple-input multiple-output (MIMO) with a large number of antennas are usually employed to enable beamforming. Therefore, a combination of the large number of antennas which can be called massive MIMO technology with mm-Wave bands are considered as one solution for substantially increasing the data rate for future wireless communication syste

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Gaddam, Sharath Chandra Reddy. "ACHIEVABLE RATE ANALYSIS OF NOMA-AIDED MASSIVE MIMO SYSTEMS." OpenSIUC, 2019. https://opensiuc.lib.siu.edu/theses/2569.

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The non-orthogonal multiple access (NOMA) and massive multiple-input multiple-output (MIMO) technologies have become integral parts of the emerging fifth-generation (5G) wireless standard. This thesis focuses on investigating the potential of integrating NOMA with massive MIMO to enable massive connectivity with high spectral efficiency and low end-to-end latency for the next generation wireless systems.

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Mollén, Christopher. "On Massive MIMO Base Stations with Low-End Hardware." Licentiate thesis, Linköpings universitet, Kommunikationssystem, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-130516.

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Massive MIMO (Multiple-Input Multiple-Output) base stations have proven, both in theory and in practice, to possess many of the qualities that future wireless communication systems will require. They can provide equally high data rates throughout their coverage area and can concurrently serve multiple low-end handsets without requiring wider spectrum, denser base station deployment or significantly more power than current base stations. The main challenge of massive MIMO is the immense hardware complexity and cost of the base station—each element in the large antenna array needs to be indivi

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Ktari, Mohamed Aymen. "Machine Learning for beam Alignment in mmWave massive MIMO." Electronic Thesis or Diss., Institut polytechnique de Paris, 2023. http://www.theses.fr/2023IPPAT047.

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La demande croissante en efficacité spectrale, stimulée par les exigences strictes des réseaux 5G, a accéléré le développement de la technologie MIMO en ondes millimétriques, offrant des améliorations architecturales significatives grâce à des techniques de précodage avancées. Cette technologie présente des gains substantiels en termes d'efficacité spectrale et énergétique par rapport aux systèmes MIMO traditionnels. Cependant, le potentiel transformateur du MIMO en mmWave est entravé par les réalités complexes des environnements urbains réels et les propriétés physiques complexes inhérentes a

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Al, Hajj Maarouf. "Radio frequency exposure analysis in 5G massive MIMO systems." Electronic Thesis or Diss., Institut polytechnique de Paris, 2022. http://www.theses.fr/2022IPPAT003.

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Cette thèse présente des mesures in-situ d'une antenne massive MIMO et analyse les différents paramètres pertinents pour l'estimation de l'exposition aux CEM dans un réseau 5G. De multiples méthodes sont présentées et discutées pour estimer la puissance reçue dans le réseau tout en se concentrant sur les avantages et les inconvénients de chacune d'elles.Cette thèse propose également une nouvelle méthode analytique pour étudier l'exposition moyenne, représentée par la puissance totale reçue, dans un réseau 5G massive MIMO dans la bande mmWave. En utilisant la géométrie stochastique, une équatio

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Gholamipourfard, Roya. "Cell-Free massive MIMO receiver design and channel estimation." Electronic Thesis or Diss., Sorbonne université, 2021. http://www.theses.fr/2021SORUS285.

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Les systèmes sans fil de la prochaine génération doivent répondre à la demande croissante de débits de données de plus en plus élevés à des prix très compétitifs et être capables de s'adapter efficacement à une vaste gamme dynamique de services, d'applications et de types de dispositifs attendus dans un avenir proche. Les systèmes sans fil ultra-denses envisagent des UD-DAS basés sur des antennes distribuées à distance. Toutefois, ni les systèmes d'antennes distribuées ni la technologie MIMO massive ne permettront de répondre aux demandes de débit de données croissantes de la prochaine générat

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Alkhaled, Makram Hashim Mahmood. "Performance enhancement of massive MIMO systems under channel correlation and pilot contamination." Thesis, University of Manchester, 2018. https://www.research.manchester.ac.uk/portal/en/theses/performance-enhancement-of-massive-mimo-systems-under-channel-correlation-and-pilot-contamination(05802cd8-8265-40a0-a9b6-9fe8ab5cfde2).html.

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The past decade has seen an enormous increase in the number of connected wireless devices, and currently there are billions of devices that are connected and managed by wireless networks. At the same time, the applications that are running on these devices have also developed significantly and became more data rate insatiable. As the number of wireless devices and the demand for a high data rate will always increase, in addition to the growing concern about the energy consumption of wireless communication systems, the future wireless communication systems will have to meet three main requireme

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Bertilsson, Erik. "A Scalable Architecture for Massive MIMO Base Stations Using Distributed Processing." Thesis, Linköpings universitet, Datorteknik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-133998.

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Massive MIMO is an emerging technology for future wireless systems that has received much attention from both academia and industry recently. The most prominent feature of Massive MIMO is that the base station is equiped with a large number of antennas. It is therefore important to create scalable architectures to enable simple deployment in different configurations. In this thesis, a distributed architecture for performing the baseband processing in a massive OFDM MU-MIMO system is proposed and analyzed. The proposed architecture is based on connecting several identical nodes in a K-ary tree.

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Зоря, Віталій Олегович. "Технологія 5G для пристроїв IoT". Магістерська робота, Хмельницький національний університет, 2021. http://elar.khnu.km.ua/jspui/handle/123456789/11019.

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В дипломній роботі проаналізовано мережу 5G з точки зору проектування в умовах багатоповерхової забудови із застосуванням технології MIMO і хвиль сантиметрового і міліметрового діапазонів. Проведено аналіз особливостей проектування і будівництва мереж зв'язку в умовах щільної багатоповерхової забудови з врахуванням високої щільність забудови. Застосовано програмні засоби моделювання для моделювання прототипу мережі п'ятого покоління з використанням технологій SISO, MIMO 4x4 і Massive MIMO на частотах 3,55 і 30 ГГц.

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Vara, Prasad Koppisetti Naga Raghavendra Surya. "Massive MIMO for 5G wireless networks : an energy efficiency perspective." Thesis, University of British Columbia, 2015. http://hdl.handle.net/2429/56553.

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As we progress towards the fifth generation (5G) of wireless networks, the bit-per-joule energy efficiency (EE) metric becomes an important design criterion because it allows for operation at practically affordable energy consumption levels. In this regard, one of the key technology enablers for 5G is the recently proposed massive multiple-input multiple-output (MIMO) technology, which is a special case of multiuser MIMO with an excess of base station (BS) antennas. However, techniques for extracting large EE gains from massive MIMO (MM) networks have not been actively investigated so far. We

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Zhang, Siming. "LTE-advanced and massive MIMO evaluation in realistic urban environments." Thesis, University of Bristol, 2016. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.702909.

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Kurras, Martin [Verfasser], and Gerhard [Akademischer Betreuer] Bauch. "Massive MIMO in cellular networks / Martin Kurras ; Betreuer: Gerhard Bauch." Hamburg : Universitätsbibliothek der Technischen Universität Hamburg-Harburg, 2020. http://d-nb.info/1206999152/34.

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Mi, De. "Massive MIMO with imperfect channel state information and practical limitations." Thesis, University of Surrey, 2017. http://epubs.surrey.ac.uk/841236/.

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Multi-user (MU) massive multiple-input-multiple-output (MIMO) is one of the promising technologies for the 5th Generation of wireless communication systems. However, as an emerging technology, various technical challenges that hinder practical use of massive MIMO need to be addressed, e.g., imperfections on channel estimation and channel reciprocity. The overall objective of the proposed research is to investigate some of the key practical challenges of implementation of the massive MIMO system and propose effective solutions for those problems. First, in order to realise promised benefits of

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Al-Askery, Ali Jaber Abdulwahab. "Reduced complexity detection for massive MIMO-OFDM wireless communication systems." Thesis, University of Newcastle upon Tyne, 2017. http://hdl.handle.net/10443/3880.

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The aim of this thesis is to analyze the uplink massive multiple-input multipleoutput with orthogonal frequency-division multiplexing (MIMO-OFDM) communication systems and to design a receiver that has improved performance with reduced complexity. First, a novel receiver is proposed for coded massive MIMO-OFDM systems utilizing log-likelihood ratios (LLRs) derived from complex ratio distributions to model the approximate effective noise (AEN) probability density function (PDF) at the output of a zero-forcing equalizer (ZFE). These LLRs are subsequently used to improve the performance of the de

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Cabral, Lorenzo Jose Barbosa. "Massive MIMO." Master's thesis, 2017. http://hdl.handle.net/10071/14821.

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Com a chegada da quinta geração de comunicações móveis (5G) espera-se que os sistemas de comunicação sem fios possam oferecer novos e melhores serviços com ritmos de transmissão elevadíssimos. O aumento significativo do bit rate que se prevê com o incremento dos utilizadores e dos dispositivos a ligar a rede, a entrada da IoT e outas tecnologias, isto sem perder de vista as inúmeras dificuldades da elevada dispersão associada à propagação multipercurso dos sinais, as elevadas taxas de eficiência e potência exigidas e a grande capacidade e flexibilidade esperadas nos novos sistemas, são fa

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Ferreira, Afonso Mendes. "Massive MIMO transmission techniques." Master's thesis, 2016. http://hdl.handle.net/10362/20365.

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Next generation of mobile communication systems must support astounding data traffic increases, higher data rates and lower latency, among other requirements. These requirements should be met while assuring energy efficiency for mobile devices and base stations. Several technologies are being proposed for 5G, but a consensus begins to emerge. Most likely, the future core 5G technologies will include massive MIMO (Multiple Input Multiple Output) and beamforming schemes operating in the millimeter wave spectrum. As soon as the millimeter wave propagation difficulties are overcome, the full pote

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