Book•
4G: LTE/LTE-Advanced for Mobile Broadband
21 Mar 2011-
TL;DR: In this article, the authors focus on LTE with full updates including LTE-Advanced to provide a complete picture of the LTE system, including the physical layer, access procedures, broadcast, relaying, spectrum and RF characteristics, and system performance.
Abstract: Based on the bestseller "3G Evolution - HSPA and LTE for mobile broadband" and reflecting the ongoing success of LTE throughout the world, this book focuses on LTE with full updates including LTE-Advanced to provide a complete picture of the LTE system. Overview and detailed explanations are given for the latest LTE standards for radio interface architecture, the physical layer, access procedures, broadcast, relaying, spectrum and RF characteristics, and system performance. Key technologies presented include multi-carrier transmission, advanced single-carrier transmission, advanced receivers, OFDM, MIMO and adaptive antenna solutions, advanced radio resource management and protocols, and different radio network architectures. Their role and use in the context of mobile broadband access in general is explained. Both a high-level overview and more detailed step-by-step explanations of the LTE/LTE-Advanced implementation are given. An overview of other related systems such as GSM/EDGE, HSPA, CDMA2000, and WIMAX is also provided. This book is a 'must-have' resource for engineers and other professionals in the telecommunications industry, working with cellular or wireless broadband technologies, giving an understanding of how to utilize the new technology in order to stay ahead of the competition. The authors of the book all work at Ericsson Research and have been deeply involved in 3G and 4G development and standardisation since the early days of 3G research. They are leading experts in the field and are today still actively contributing to the standardisation of LTE within 3GPP. Includes full details of the latest additions to the LTE Radio Access standards and technologies up to and including 3GPP Release 10Clear explanations of the role of the underlying technologies for LTE, including OFDM and MIMO Full coverage of LTE-Advanced, including LTE carrier aggregation, extended multi-antenna transmission, relaying functionality and heterogeneous deploymentsLTE radio interface architecture, physical layer, access procedures, MBMS, RF characteristics and system performance covered in detail
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Dissertation•
18 Mar 2015
TL;DR: In this article, the authors propose linearization d'amplificateurs RF haute-puissance and large-bande par predistorsion numerique (DPD) and reduction du PAPR du signal (CFR).
Abstract: L'amplificateur de puissance est le module le plus critique dans les equipements de communication radio. Il determine la qualite de la liaison par sa linearite et a une contribution consequente dans la consommation de l'emetteur ; environ 60% de l'energie consommee est consacre a l'amplification. Il est donc crucial de le faire fonctionner avec un rendement energetique eleve. Cependant, ces deux specifications principales de l'amplificateur que sont la linearite et le rendement energetique sont antagoniques. Par consequent, la conception d'un module d'amplification de puissance suppose de trouver un compromis entre la linearite et le rendement. L'optimisation de ce compromis est la raison d'etre des techniques de linearisation d'amplificateurs et d'amelioration du rendement, parmi lesquelles la predistorsion numerique (DPD) et les techniques de reduction du PAPR du signal (CFR).Le cœur de cette these est la linearisation d'amplificateurs RF haute-puissance et large-bande par predistorsion numerique (DPD). Dans ces travaux, nous abordons trois problematiques liees a la predistorsion et qui constituent des verrous technologiques importants. Le premier aspect concerne l'implementation de la predistorsion numerique dans un contexte multi-bande ou le signal a lineariser comporte plusieurs formes d'ondes, situees a des frequences differentes. La seconde problematique est l'utilisation conjointe de la predistorsion avec une technique de CFR. Dans la majorite des applications haute-puissance, les techniques de DPD et de CFR sont presentes de maniere complementaire, cependant elles sont utilisees de facon autonome et disjointe. Celles-ci gagneraient en performances de linearisation en etant implementees de maniere plus concertee. . Le dernier theme aborde par cette these est l'effet des desadaptations d'impedance de l'antenne sur le mode de fonctionnement de l'amplificateur. La variation de l'impedance d'antenne entraine des reflexions de signal vers l'amplificateur qui modifient ses specifications de linearite et de rendement. Nous ameliorons la linearite du systeme DPD + AP, lorsque l'amplificateur est soumis a des variations de l'impedance a sa charge, grâce a une correction adaptative de gain
5 citations
Patent•
07 Apr 2016TL;DR: In this paper, a radio access node for a cellular communications network is disclosed, wherein the radio access nodes comprises a transceiver, a processor, and memory storing instructions executable by the processor, whereby the radio node is operable to transmit, via the transceiver and a wireless device using one or more Physical Resource Blocks (PRBs) that comprise reserved Resource Elements (REs) by puncturing the downlink transmission at positions of the reserved REs.
Abstract: Systems and methods are disclosed herein that relate to transmitting and receiving a transmission when there is a collision between the transmission and reserved resource elements. In some embodiments, a radio access node for a cellular communications network is disclosed, wherein the radio access node comprises a transceiver, a processor, and memory storing instructions executable by the processor whereby the radio access node is operable to transmit, via the transceiver, a downlink transmission to a wireless device using one or more Physical Resource Blocks (PRBs) that comprise reserved Resource Elements (REs) by puncturing the downlink transmission at positions of the reserved REs. In some embodiments, the downlink transmission is an Enhanced Physical Downlink Control Channel (EPDCCH) transmission or a Physical Downlink Shared Channel (PDSCH) transmission. Further, in some embodiments, the reserved REs are REs utilized for one or more CSI-RSs.
5 citations
Patent•
30 May 2019TL;DR: In this article, the authors present a network planning model that schedules transmissions, determines the number and types of equipment needed to support the transmissions, assigns equipment to specific locations, and optimally routes items throughout the network.
Abstract: Features related to systems and methods for network planning based on optimization modeling of equipment and item transmissions. The network planning may include a model to plan for transmission of items over a network to maximize overall efficiencies over alternative transmission modes. The model may produce a network plan that schedules transmissions, determines the number and types of equipment needed to support the transmissions, assigns equipment to specific locations, and optimally routes items throughout the network.
4 citations
TL;DR: It is shown that the coverage is highly dependent on the severity of shadowing, the power control scheme, and its parameters, but invariant of the density of deployment of base stations when the shadowing is mild and power control is fractional.
Abstract: In cellular networks, each mobile station adjusts its power level under control of its base station, i.e., through uplink transmit power control, which is essential to reach desired signal-to-interference-plus-noise ratio (SINR) at the base station and to limit inter-cell interference. The optimal levels of transmit power in a network depend on path loss, shadowing, and multipath fading, as well as the network configuration. However, since path loss is distance dependent and the cell association distances are correlated due to the cell association policies, the performance analysis of the uplink transmit power control is very complicated. Consequently, the impact of a specific power control algorithm on network performance is hard to quantify. In this paper, we analyze three uplink transmit power control schemes. We assume the standard power-law path loss and composite Rayleigh-lognormal fading. Using stochastic geometry tools, we derive the cumulative distribution function and the probability density function of the uplink transmit power and the resulting network coverage probability. It is shown that the coverage is highly dependent on the severity of shadowing, the power control scheme, and its parameters, but invariant of the density of deployment of base stations when the shadowing is mild and power control is fractional. At low SINRs, compensation of both path loss and shadowing improves the coverage. However, at high SINRs, compensating for path loss only improves coverage. Increase in the severity of shadowing significantly reduces the coverage.
4 citations
Cites background or methods from "4G: LTE/LTE-Advanced for Mobile Bro..."
...Reference [14] investigates uplink outage probability in a multi-channel environment and captures the load variation on BSs. Uplink SINR and rate distribution in a massive multiple input multiple output (MIMO) network are investigated in [16]....
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...• Comparing the performance of three power control schemes, we show that at low SINRs (cell edge users), compensating for both path loss and shadowing improves the coverage probability....
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...S Mukherjee, Distribution of downlink SINR in heterogeneous cellular networks....
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...1 Prior related research In general, uplink power control may be a combination of two mechanisms: open-loop and closed-loop [1]....
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...T Bai, RW Heath, Analyzing uplink SINR and rate in massive MIMO systems using stochastic geometry....
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TL;DR: This paper undertakes a comprehensive verification of the performance of transmit diversity MIMO in the downlink sector of LTE using models built using MATLAB to carry out simulations and deduced that generally increasing transmit diversity configuration from 2x2 to 4x4 offers SNR savings in flat fading channels though with a user equipment moving at 30km/hr, deploying 1x2 offers higher SNR saving below 7dB.
Abstract: antenna(MIMO) techniques are reported to improve the performance of radio communication systems in terms of their capacity and spectral efficiency. In combination with appropriate receiver technologies they can also provide savings in the required transmit power with respect to target bit error rate. Long Term Evolution(LTE), one of the candidates for fourth generation(4G) mobile communication systems has MIMO as one of its underlying technologies and ITU defined channel models for its propagating environment. This paper undertakes a comprehensive verification of the performance of transmit diversity MIMO in the downlink sector of LTE. It uses models built using MATLAB to carry out simulations. It is deduced that generally increasing transmit diversity configuration from 2x2 to 4x4 offers SNR savings in flat fading channels though with a user equipment moving at 30km/hr, deploying 2x2 offers higher SNR saving below 7dB. Furthermore bandwidth variation has minimal effect on the BER performance of transmit MIMO except at SNR values above 9dB while the gains of higher modulation schemes come with a transmit power penalty.
4 citations
Cites methods from "4G: LTE/LTE-Advanced for Mobile Bro..."
...Propagation channel models used in this paper are as per the ITU defined channel profiles [5,6]....
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