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Dissertations / Theses on the topic '5G Cellular systems'

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1

Guidolin, Francesco. "Efficient Spectrum Management as an Enabler Towards 5G Cellular Systems." Doctoral thesis, Università degli studi di Padova, 2015. http://hdl.handle.net/11577/3423934.

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Advanced spectrum sharing and resource management techniques are needed in future wireless cellular networks to ensure high data rates to the end users. New system architec- tures will be required, taking into account aspects such as like spectrum resources availabil- ity, deployment and operational costs, as well as power consumption. Thus, it becomes key for the development of the fifth generation of cellular networks (5G) to pursue an efficient exploitation of the wireless medium, in the sense of both using advanced physical (PHY) layer techniques, and also seeking coordination among operat
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Olsson, Joel, and Junior Asante. "5G Simulation Framework." Thesis, Linköpings universitet, Kommunikationssystem, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-149484.

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From the first generation, 1G, to the fourth generation, 4G, the development and technological advancements in telecommunications network systems have been remarkable. Faster and better connections have opened up for new markets, ideas and possibilities, to that extent that there now is a demand that surpasses the supply. Despite all these advancements made in the mobile communications field most of the concept of how the technology works and its infrastructure has remained the same. This however, is about to change with the introduction of the fifth generation (5G) mobile communication. With
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Iscar, Vergara Jorge. "Channel and Noise Variance Estimation for Future 5G Cellular Networks." FIU Digital Commons, 2016. http://digitalcommons.fiu.edu/etd/3026.

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Future fifth generation (5G) cellular networks have to cope with the expected ten-fold increase in mobile data traffic between 2015 and 2021. To achieve this goal, new technologies are being considered, including massive multiple-input multiple-output (MIMO) systems and millimeter-wave (mmWave) communications. Massive MIMO involves the use of large antenna array sizes at the base station, while mmWave communications employ frequencies between 30 and 300 GHz. In this thesis we study the impact of these technologies on the performance of channel estimators. Our results show that the characterist
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4

Bernabè, Matteo. "Machine learning based traffic analysis and forecast for 5G Systems." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021.

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Mobile traffic forecasting is a relatively new research area, which is becoming of fundamental importance for next-generation networks. Proactively knowing the user demand allows the system to allocate resources and apply energy-saving decisions properly. Classical models are limited by the stationary assumption of time sequences and fail to take correlations into account. This work presents results on cellular network traffic analysis and prediction, providing a novel, robust, and precise machine learning model to efficiently and dynamically manage network resources in 5G systems.
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5

Tello, Oquendo Luis Patricio. "Design and Performance Analysis of Access Control Mechanisms for Massive Machine-to-Machine Communications in Wireless Cellular Networks." Doctoral thesis, Universitat Politècnica de València, 2018. http://hdl.handle.net/10251/107946.

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En la actualidad, la Internet de las Cosas (Internet of Things, IoT) es una tecnología esencial para la próxima generación de sistemas inalámbricos. La conectividad es la base de IoT, y el tipo de acceso requerido dependerá de la naturaleza de la aplicación. Uno de los principales facilitadores del entorno IoT es la comunicación machine-to-machine (M2M) y, en particular, su enorme potencial para ofrecer conectividad ubicua entre dispositivos inteligentes. Las redes celulares son la elección natural para las aplicaciones emergentes de IoT y M2M. Un desafío importante en las redes celulares es c
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Leoni, Elia. "Initial Access Techniques for 5G systems." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019. http://amslaurea.unibo.it/17708/.

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Nei prossimi anni è previsto un aumento del traffico dati, e la quinta generazione cellulare 5G dovrà fare affidamento su nuove tecnologie, come le onde millimetriche e il massive-MIMO, per soddisfare tale richiesta. Lo spettro di frequenze sotto i 6 GHz risulta infatti sovra-utilizzato, e le frequenze relative alle onde millimetriche promettono di garantire alte velocità di trasmissione dei dati, grazie alla grande disponibilità di banda, specialmente attorno ai 60 GHz. Nonostante questo aspetto favorevole, si ha però un elevato path loss e la difficoltà nel penetrare gli ostacoli. Per ovviar
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7

Mašek, Pavel. "Heterogenní propojení mobilních zařízení v bezdrátových systémech 5. generace." Doctoral thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2017. http://www.nusl.cz/ntk/nusl-358407.

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Předkládaná disertační práce je zaměřena na "heterogenní propojení mobilních zařízení v bezdrátových systémech 5. generace". Navzdory nepochybnému pokroku v rámci navržených komunikačních řešení postrádají mobilní sítě nastupující generace dostatečnou šířku pásma a to hlavně kvůli neefektivnímu využívání rádiového spektra. Tato situace tedy v současné době představuje řadu otázek v oblasti výzkumu. Hlavním cílem této disertační práce je proto návrh nových komunikačních mechanismů pro komunikaci mezi zařízeními v bezprostřední blízkosti s asistencí mobilní sítě a dále pak návrh a implementace a
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8

Leyva, Mayorga Israel. "On reliable and energy efficient massive wireless communications: the road to 5G." Doctoral thesis, Universitat Politècnica de València, 2019. http://hdl.handle.net/10251/115484.

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La quinta generación de redes móviles (5G) se encuentra a la vuelta de la esquina. Se espera provea de beneficios extraordinarios a la población y que resuelva la mayoría de los problemas de las redes 4G actuales. El éxito de 5G, cuya primera fase de estandarización ha sido completada, depende de tres pilares: comunicaciones tipo-máquina masivas, banda ancha móvil mejorada y comunicaciones ultra fiables y de baja latencia (mMTC, eMBB y URLLC, respectivamente). En esta tesis nos enfocamos en el primer pilar de 5G, mMTC, pero también proveemos una solución para lograr eMBB en escenarios de distr
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9

LIN, GUAN-YU, and 林冠宇. "Random Access Performance of Two-layer 5G Cellular Systems." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/22784347945454586411.

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碩士<br>國立中正大學<br>通訊工程研究所<br>104<br>Two-layer cell architecture has been proposed as a candidate for future 5G systems, where the system constitutes of macro cells and small cells. Macro cells use the existing 4G system while small cell use 5G technology to provide higher high data rate and system capacity. A user first camps 4G systems through contention-based random access mechanism, and when very high data rate is needed it is handed over to 5G systems via contention-free random access. Whether the current 4G random access design is able to cope with the very large number of users anticipated
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10

Hung, Ming-Chien, and 洪銘謙. "A Study on Pilot Contamination Suppression Methods for 5G Cellular Mobile Radio Communication Systems." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/28q7h9.

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碩士<br>國立交通大學<br>電信工程研究所<br>103<br>In this thesis, we propose two kinds of iterative channel estimation method to suppress the pilot contamination phenomenon in 5G cellular mobile radio communication systems. Due to pilot sequence reuse in different cells, the estimated channel would be contaminated by neighboring cells which use the same pilot. To solve the pilot contamination problems caused by pilot sequence reuse, we first use estimated data sequence as a pilot signal to execute iterative channel estimation. Secondly, as the pilot and data sequences are transmitted in a combined manner, our
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11

Hung, Yi-Ting, and 洪翊庭. "Computer Simulation and Capacity Comparison on 5G Massive Antenna MDMA and SDMA Cellular Systems." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/prac2v.

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碩士<br>國立交通大學<br>電信工程研究所<br>108<br>With the development of the wireless communication technology, the fifth generation(5G) mobile communication standards will be formally released by 2020 and applied to commerce. People from all walks of life dedicate to developing 5G communication system to meet the higher demand of transmission, and space division multiple access (SDMA) is regarded as a key technology. In response to 5G communication system, our lab researches on a possible technique known as the massive antenna multipath division multiple access (MDMA) cellular system. In this thesis, we com
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12

Vineeth, Kumar V. "Reduced Feedback Schemes in 4g/5g Ofdm Systems: Modeling, Performance Analysis and Redesign." Thesis, 2020. https://etd.iisc.ac.in/handle/2005/4376.

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Reduced feedback schemes are a crucial component of orthogonal frequency division multiplexing-based 4G and 5G cellular systems that use downlink scheduling, adaptive modulation and coding, and multiple-input-multiple-output (MIMO). In these systems, the system bandwidth is divided into several subbands. The reduced feedback schemes ensure that the overhead of feeding back the subband-level channel state information from the users to the base station (BS) does not overwhelm the limited-bandwidth uplink feedback channel. Differential feedback is a key component of the reduced feedback sc
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13

Li, Yue. "Machine-type-communication in 5G cellular system." Thesis, 2018. https://dspace.library.uvic.ca//handle/1828/9966.

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The rapid development of Machine-Type-Communication (MTC) has brought big challenges to cellular networks such as super-dense devices and high-shadowing channels which may substantially decrease the spectrum efficiency and increase devices' power consumption. It is pressing to improve the transmission efficiency for MTC due to the limited wireless spectrum. Lower efficiency may also lead to longer transmission time and more energy consumption which conflict with MTC's requirement of lower power consumption. In order to address the above issues, we propose to apply Network Coding (NC) and D
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14

Tang, Zhi-Wen, and 湯志文. "A Study of Power Control Methods for the Proposed 5G Cellular System." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/92959715730899600763.

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碩士<br>國立交通大學<br>電信工程研究所<br>104<br>In the proposed 5G cellular system [1], all users use the same frequency band to transmit data; like CDMA systems, any excessive transmit power will increase the overall interference. Without power control mechanisms, better link quality and system capacity cannot be achieved in the proposed 5G cellular system. We adopt open-loop power control in uplink transmission for combating near-far problem so that equal signal power from the mobiles can be received by the same BS. The performance of uplink power control is evaluated by power control error. Power control
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15

Huang, Yen-Chieh, and 黃彥傑. "A Study on the Capacity of the 5G Massive Antenna MDMA Cellular System under Different Cellular Structures." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/d5ccdm.

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碩士<br>國立交通大學<br>電信工程研究所<br>106<br>Through the advance of communication technology, the time of 5G mobile communication is arrived. A possible technique for 5G cellular system is called the TDD massive antenna multipath division multiple access (MDMA) system. In this thesis, we simulate this system under different cellular structures, and evaluate the capacity of uplink(UL) and downlink(DL) systems. In uplink, base station(BS) uses pilot signals sent by mobile stations (MS) to estimate channel and use Parallel-Interference-Cancellation(PIC) and Kalman filter to suppress interference. At last, w
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16

Chang, Chi-Po, and 張期博. "A Study on Soft Handoff for Improving SIR Performance in 5G Cellular System." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/35915141589873904019.

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碩士<br>國立交通大學<br>電信工程研究所<br>104<br>In next ten years, existing mobile communication standards obviously cannot meet with users’ need. In reponse to this, we study on a fifth generation cellular system that uses the method of soft handoff. In this thesis, we research on the improvement of SIR in downlink and uplink system when soft handoff is executed. We consider the cellular system with home cell and four tiers. We start from a cellular system without soft handoff and calculate the SIR distribution. We will then do soft handoff with two base station for these users who cannot achieve the targe
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17

Ho, Ka-Hou, and 何家豪. "A Study on UFMC and Synchronization for 5G Massive Antenna MDMA Cellular System." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/way7d6.

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碩士<br>國立交通大學<br>電信工程研究所<br>105<br>In this thesis, we studied and investigated the synchronization procedure for universal filtered multi-carrier (UFMC) in our proposed 5G massive antenna multipath division multiple access (MDMA) cellular system of downlink transmission. In our system, we consider multicarrier modulation to transmitted traffic data. One of the multicarrier scheme is OFDM, which has the problem of high out-of-band power. UFMC is a novel multicarrier transmission scheme, and it can suppress out-of-band power effectively as compared to OFDM system. In addition, multicarrier scheme
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18

Lin, Chia-Hao, and 林迦豪. "A Study on Channel Estimation Methods for 5G Massive Antenna MDMA Cellular System." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/8f4745.

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碩士<br>國立交通大學<br>電信工程研究所<br>105<br>With the ever-changing nature of telecommunication technologies, the fifth generation (5G) mobile communication standards will be finalized by 2020. Currently, both the academia and industry are dedicated to the development of possible solutions that meet the challenging demands of the 5G communication systems. In response to this, we research on one of the possible techniques known as the massive antenna multipath division multiple access (MDMA) cellular system. In this thesis, methods for improving channel estimation under this mobile radio communication sys
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19

Chen, Wei-Yao, and 陳韋耀. "A Study on Trellis-Coded Modulation for the 5G Massive Antenna MDMA Cellular System." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/pqaeea.

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碩士<br>國立交通大學<br>電信工程研究所<br>105<br>Our proposed 5G massive antenna multipath division multiple access (MDMA) cellular system is an interference-limited system. All users use the same time slot and frequency band to transmit data; like CDMA system, the signal-to-interference ratio is a major impact on the system capacity. Hence, in data transmission, the use of trellis-coded modulation (TCM), which can tolerate more interference, can achieve better system capacity. In this thesis, the concept of TCM is introduced, and the performances of several kinds of TCM are investigated. Also, the uplink an
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20

Chiu, Ta-Wei, and 邱大維. "A Study on Initial Cell Search Procedure in 5G MDMA Massive Antenna Cellular System." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/9zn548.

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碩士<br>國立交通大學<br>電信工程研究所<br>106<br>In 5G cellular system, there exists the problem of initial cell search when the mobile boots up in the cellular system. In this thesis, we studied the cell search procedure in 5G massive antenna multipath division multiple access (MDMA) cellular system. In our proposed system, traffic data is transmitted by orthogonal frequency division multiplexing (OFDM) in frequency domain, and control data is transmitted by polyphase sequence in time domain. A frame structure design is proposed in order to support mobile station with velocity lower than 90 m/s, then, the i
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Tsai, Yun-Ting, and 蔡昀廷. "A Study on Channel Estimation for 5G Massive Antenna MDMA Cellular System with Different Pilot Sequences." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/x528s8.

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碩士<br>國立交通大學<br>電信工程研究所<br>105<br>In next ten years, existing communication standards obviously cannot meet with the needs of future 5G mobile communications. In response to this, we research on one of the possible techniques in 5G cellular system, which is a TDD massive antenna multipath division multiple access (MDMA) system. In this thesis, channel estimation for massive antenna MDMA mobile radio communication system based on different pilot sequences are investigated. We explored Orthogonal Frequency-Division Multiplexing (OFDM) and adopt maximum ratio combining in uplink (UL). We use diff
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22

Lan, Yi-Hsin, and 藍亦欣. "A Study on Uplink Multiuser Data Detection Methods for the 5G Massive Antenna MDMA Cellular System." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/33dz4q.

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碩士<br>國立交通大學<br>電信工程研究所<br>105<br>In the 5G cellular system, we propose a massive antenna multipath division multiple access (MDMA) system which is interference-limited. The system capacity and BER performance are both affected by interference from other users. In this thesis, we focus on the discussion of uplink multiuser detection method for parallel interference cancellation (PIC). For the purpose of reducing interference from other users and improving the BER performance, we propose two methods to improve the performance of PIC, which are partial PIC and soft decision. Finally, we evaluate
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23

Liu, Chen-Chieh, and 柳振傑. "A Study on Downlink Control Signal Design and Detection for 5G Massive Antenna MDMA Cellular System." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/ufq3dd.

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碩士<br>國立交通大學<br>電信工程研究所<br>106<br>For the 5G cellular system, we proposed a massive antenna multipath division multiple access (MDMA) system which is interference-limited. The system capacity and BER performance are both affected by interference from other users. In this thesis, we focus on the discussion of downlink control signal detection with interference from other users. We use DPSK spread spectrum modulation to transmit control data. For the purpose of reducing interference we use spread spectrum technology to improve the performance of control signal BER. We propose different methods t
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24

Su, Jing-Jing, and 蘇晶晶. "A Study on Power Control and Soft Handoff Methods for the 5G Massive Antenna MDMA Cellular System." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/3jj7a9.

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碩士<br>國立交通大學<br>電信工程研究所<br>106<br>The proposed 5G Massive Antenna MDMA cellular system is an interference limited system [1], any excessive transmission power of data will aggravate the interference. In this thesis, we research on several power control algorithms and soft handoff methods in order to suppress the interference and improve the system capacity. The enhanced SIR power control algorithm is proposed to increase the system capacity and decrease the convergence rate of power control algorithm. Besides, the power ratio for soft handoff is adjusted to suppress both inter-cell and intra-c
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25

Chiu, Chun-Xiang, and 邱春翔. "A Study on Integration and Refinement of Channel Estimation and Data Detection for 5G Massive Antenna MDMA Cellular System." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/uqtsp6.

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碩士<br>國立交通大學<br>電信工程研究所<br>106<br>The requirement for all aspects of mobile phones increases along with the popularization of mobile phones. Among all of them, the most obvious part is very high data rate. Therefore, the fifth generation (5G) mobile communication systems are scheduled to start formally in 2020. Both the academia and industry devote themselves to the development of the 5G communication systems at present and look forward to satisfy the requirement of very high data rate. In response to the research of 5G communication systems, we propose a possible solution which is named massi
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Lin, Bing-Ru, and 林秉儒. "A Study on Handset Synchronization and Cell Search Methods for 5G Cellular System based on Massive Antennas in Millimeter Wave Band." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/73964105903578128118.

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碩士<br>國立交通大學<br>電信工程研究所<br>104<br>In the 5G cellular system, there exists the problem of synchronization and cell search when the mobile boots up. In this thesis, we propose a new method to execute synchronization and cell search. The cell search procedure is discussed and is divided into four different stages in the 5G cellular system. The users' data signals are transmitted in the time domain and we execute cell search according to control signals transmitted in the frequency domain at the same time. In the first stage, we use the received signal with the proposed algorithm to estimate symbo
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27

(5929793), Syed Rafiul Hussain. "A Systematic Framework For Analyzing the Security and Privacy of Cellular Networks." Thesis, 2020.

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<div>Cellular networks are an indispensable part of a nation's critical infrastructure. They not only support functionality that are critical for our society as a whole (e.g., business, public-safety message dissemination) but also positively impact us at a more personal level by enabling applications that often improve our quality of life (e.g., navigation). Due to deployment constraints and backward compatibility issues, the various cellular protocol versions were not designed and deployed with a strong security and privacy focus. Because of their ubiquitous presence for connecting billions
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