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•
01 Jan 2013
TL;DR: This thesis work implements multiuser schedulers that allocate the available recourse blocks (RBs) and assign a proper MCS to different users within single input single output (SISO) transmission scheme in physical layer and investigates their performance.
Abstract: Long term evolution (LTE) of universal mobile telecommunications system (UMTS) is one of the most developed wireless broadband systems worldwide. Based on orthogonal frequency-division multiple access (OFDMA), it provides high-speed data packets access for various deployment scenarios. Link adaptation is a technique used in the LTE system in order to exploit the benefits of the frequency selectivity of the wireless channels. With link adaptation, the spectral efficiency can be further improved. But to perform link adaptation, certain quality information of the channel is required at the transmitter side. In the frequency-division duplex (FDD) LTE system, the channel quality information is fed back from the user equipment (UE) to the base station (eNB). For the purpose of minimizing the overhead, the channel quality information is quantized and the UE only feeds back the corresponding channel quality index (CQI) to the eNB. Various ways of calculating the CQI at the UE side has been proposed and one of the most accepted ways is the exponential effective SINR mapping (EESM) that is utilized in this thesis. In order to minimize the control signal overhead, in the LTE standard, only one modulation and coding scheme (MCS) can be used for each UE in the downlink, though UE may feed back different CQI values for its preferred sub-band. 15 different CQIs and their corresponding MCSs have been defined as the uplink feedback values. In this thesis work, we implement multiuser schedulers that allocate the available recourse blocks (RBs) and assign a proper MCS to different users within single input single output (SISO) transmission scheme in physical layer and investigate their performance.
5 citations
TL;DR: Several objective metrics, such as the ratio of lost packets, the peak signal to noise ratio, the Structural SIMilarity, the application goodput, and packet delays, have been evaluated to show the LTE-A effectiveness in delivering 3D videos in a realistic last generation mobile environment.
Abstract: Due to the ever growing interest of 3-dimensional (3D) technology, together with the the widespread use of new generation smartphones, netbooks, and tablets, the idea to provide 3D multimedia services also to mobile users is attracting the attention of researchers worldwide. The emerging long term evolution-advanced (LTE-A) technology seems to have all the potential to offer such kind of services but no accurate studies have been yet conducted to demonstrate this assumption. To bridge this gap, we investigate herein how the LTE-A network configuration, the traffic load, and 3D video settings may influence to the quality of all services of all active flows. We consider a heterogeneous LTE-A network composed by macro and pico cells and a number of users uniformly distributed into the scenario, that receive at the same time 3D video streams, voice flows and best-effort applications. Moreover, several objective metrics, such as the ratio of lost packets, the peak signal to noise ratio, the Structural SIMilarity, the application goodput, and packet delays, have been evaluated to show the LTE-A effectiveness in delivering 3D videos in a realistic last generation mobile environment.
5 citations
03 Dec 2015
TL;DR: An overall approach to iterate over an algorithm including device grouping, power control, and priority procedure for the channel allocation sub-problem and an algorithm based on particle swarm optimization (PSO) for the site selection sub- problem to solve the target problem.
Abstract: This paper studies the base stations deployment problem in long-term evolution (LTE) based private wireless access networks for smart grid (SG). First we analyze the differences between private wireless access networks for SG and public cellular access networks. Then we propose an algorithm including device grouping, power control, and priority procedure for the channel allocation sub-problem and an algorithm based on particle swarm optimization (PSO) for the site selection sub-problem. Finally we propose an overall approach to iterate over these two algorithms to solve the target problem. Simulation results show the proposed approach can effectively solve the target problem.
5 citations
Dissertation•
28 Aug 2017
TL;DR: This thesis addresses theoretical and practical challenges of spectrally efficient frequency division multiplexing (SEFDM) systems in both wireless and optical domains and presents solutions for these issues.
Abstract: This thesis addresses theoretical and practical challenges of spectrally efficient frequency division multiplexing (SEFDM) systems in both wireless and optical domains. SEFDM improves spectral efficiency relative to the well-known orthogonal frequency division multiplexing (OFDM) by non-orthogonally multiplexing overlapped sub-carriers. However, the deliberate violation of orthogonality results in inter carrier interference (ICI) and associated detection complexity, thus posing many challenges to practical implementations. This thesis will present solutions for these issues. The thesis commences with the fundamentals by presenting the existing challenges of SEFDM, which are subsequently solved by proposed transceivers. An iterative detection (ID) detector iteratively removes self-created ICI. Following that, a hybrid ID together with fixed sphere decoding (FSD) shows an optimised performance/complexity trade-off. A complexity reduced Block-SEFDM can subdivide the signal detection into several blocks. Finally, a coded Turbo-SEFDM is proved to be an efficient technique that is compatible with the existing mobile standards. The thesis also reports the design and development of wireless and optical practical systems. In the optical domain, given the same spectral efficiency, a low-order modulation scheme is proved to have a better bit error rate (BER) performance when replacing a higher order one. In the wireless domain, an experimental testbed utilizing the LTE-Advanced carrier aggregation (CA) with SEFDM is operated in a realistic radio frequency (RF) environment. Experimental results show that 40% higher data rate can be achieved without extra spectrum occupation. Additionally, a new waveform, termed Nyquist-SEFDM, which compresses bandwidth and suppresses out-of-band power leakage is investigated. A 4th generation (4G) and 5th generation (5G) coexistence experiment is followed to verify its feasibility. Furthermore, a 60 GHz SEFDM testbed is designed and built in a point-to-point indoor fiber wireless experiment showing 67% data rate improvement compared to OFDM. Finally, to meet the requirements of future networks, two simplified SEFDM transceivers are designed together with application scenarios and experimental verifications.
5 citations
Cites background from "4G: LTE/LTE-Advanced for Mobile Bro..."
...Overall, the center carrier spacing between different CCs should be a multiple of 300 kHz [176], which is the smallest carrier spacing being a multiple of both 100 kHz (the carrier raster) and 15 kHz (the sub-carrier spacing)....
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...The location of LTE center carriers in frequency domain could be positioned anywhere as explained in [176]....
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01 Jan 2013
TL;DR: This chapter focuses on the problem of transmitting information sequences efficiently through a wireless channel and performing reception such that it can be implemented with state of the art signal processing tools.
Abstract: The data rates as well as quality of service (QoS) requirements for rich user experience in wireless communication services are continuously growing. While consuming a major portion of the energy needed by wireless devices, the wireless transceivers have a key role in guaranteeing the needed data rates with high bandwidth efficiency. The cost of wireless devices also heavily depends on the transmitter and receiver technologies. In this chapter, we concentrate on the problem of transmitting information sequences efficiently through a wireless channel and performing reception such that it can be implemented with state of the art signal processing tools. The operations of the wireless devices can be divided to RF and baseband (BB) processing. Our emphasis is to cover the BB part, including the coding, modulation, and waveform generation functions, which are mostly using the tools and techniques from digital signal processing. But we also look at the overall transceiver from the RF system point of view, covering issues like frequency translations and channelization filtering, as well as emerging techniques for mitigating the inevitable imperfections of the analog RF circuitry through advanced digital signal processing techniques.
5 citations
Cites background or methods from "4G: LTE/LTE-Advanced for Mobile Bro..."
...As an important example, 3GPP-LTE uses 15 kHz subcarrier spacing and up to 20 MHz bandwidth, the maximum FFTsize being 2048 [45]....
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...Then it is obvious that a single OFDM symbol is able to carry multiple users’ data, using so-called orthogonal frequency division multiple access (OFDMA) [45]....
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...This scheme is generally known as adaptive modulation and coding (AMC) [45]....
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...6, using DFT transform as precoding, a SC-FDMA block can be included in an OFDMA transmission frame while maintaining all the flexibility in allocation the resources to each user....
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...The practical OFDMA schemes are dynamic in the sense that variable data rates can be supported for each user....
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