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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12 Sep 2012
TL;DR: A novel service platform, based on the emerging content-centric networking paradigm, that can easily embrace all available, upcoming, and remote generation wireless techologies, while supporting, at the same time, ubiquitous and secure applications in many domains, such as: e-helthcare, intelligent transportation systems, entertainment, and many others.
Abstract: We expect around 9 billions people on the Earth within 2050, 70% of them living in urban environments. By that time, we have to be ready to support a never seen request for ICT services in order to improve the efficiency of future Smart Cities, thus allowing a pacific coexistence among humans. Inline with this premise, the present contribution proposes a novel service platform, based on the emerging content-centric networking paradigm. It can easily embrace all available, upcoming, and remote generation wireless techologies, while supporting, at the same time, ubiquitous and secure applications in many domains, such as: e-helthcare, intelligent transportation systems, entertainment, and many others. All details of the approach we propose, have been carefully described by means of pragmaticaluse-cases, thus making evident its effectivenes in future realistic urban environments.
16 citations
Cites background from "4G: LTE/LTE-Advanced for Mobile Bro..."
...The requirements of LTE networks are very ambitious [8]: they will provide high peak data rates (up to 100 Mbps in downlink and 50 Mbps in uplink with 20 Mhz of bandwidth), increased cell edge throughput, less than 5 ms user plane latency, significant reduction of control plane latency, support for high user mobility, scalable bandwidth from 1....
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...Whereas, femtocells have been devised for offering broadband services in indoor (home and offices) and outdoor scenarios with a very limited geographical coverage [8]....
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...From a technological point of view, we are at a turning point where, from one side, there is a wide availability of wireless communication technologies, such as the Internet of Things (IoT) [7], the novel cellular architectures based on Long Term Evolution (LTE) and LTE Advanced (LTE-A) specifications [8], the Worldwide Interoperability for Microwave Access (WiMAX) [9], and the Wireless Access in Vehicular Environments (WAVE) protocol stack [10], while, from the other hand, we are observing a radical change in the way digital resources are used....
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01 Jan 2015
TL;DR: Four different suppression techniques are investigated: time-domain windowing, cancellation carrier method, subcarrier weighting and polynomial cancellation coding, as well as their combinations, elaborated for a practical heterogeneous fragmented spectrum use scenario based on 5-MHz 3GPP Long-Term Evolution LTE.
Abstract: Most of the recent and emerging wireless systems have selected orthogonal frequency division multiplexing OFDM scheme as the basis for the physical layer due to its flexibility and robustness. OFDM is commonly considered also as the first candidate technology for advanced cognitive radio, dynamic spectrum use and fragmented coexistence scenarios, including the 5G system development. Nevertheless, OFDM has the problem of high-power spectral sidelobes around the active subcarriers, which limit its feasibility in fragmented spectrum use and asynchronous frequency division multiple access operation. Therefore, various sidelobe suppression techniques have been proposed in the literature to mitigate these effects. This paper investigates four different suppression techniques: time-domain windowing, cancellation carrier method, subcarrier weighting and polynomial cancellation coding, as well as their combinations. These methods are elaborated for a practical heterogeneous fragmented spectrum use scenario based on 5-MHz 3GPP Long-Term Evolution LTE, proposing various enhancements to achieve effective suppression in narrow gaps with affordable complexity. In addition to the spectral characteristics, also, the possible side effects are evaluated in details, considering peak-to-average power ratio characteristics, error rate performance, computational complexity and resources usage. Copyright © 2014 John Wiley & Sons, Ltd.
16 citations
07 Dec 2015
TL;DR: A novel idea is proposed which allows quantifying and qualifying the reliability improvement in the network remote performance by exploiting Payload bitrate and forwarding time versus average message size with/without ACK/FEC respectively.
Abstract: In this paper, we focus on efficient method for improving the reliability of data retransmission in real operational wireless communications. We analyze the effects of ACK (Acknowledge) and FEC (Forward Error Correction) on practical transmission performance of different message sizes. We propose a novel idea which allows quantifying and qualifying the reliability improvement in the network remote performance by exploiting Payload bitrate and forwarding time versus average message size with/without ACK/FEC respectively.
15 citations
Cites methods from "4G: LTE/LTE-Advanced for Mobile Bro..."
...transmission, HARQ schemes are included in the present wireless network like (WiMAX) [8] and 3GPP-LTE [9]....
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Posted Content•
TL;DR: In this article, the authors proposed a mathematical framework to model a multi-operator mmWave cellular network with co-located base-stations (BSs) and derived its coverage probability.
Abstract: Competing cellular operators aggressively share infrastructure in many major US markets. If operators also were to share spectrum in next-generation millimeter-wave (mmWave) networks, intra-cellular interference will become correlated with inter-cellular interference. We propose a mathematical framework to model a multi-operator mmWave cellular network with co-located base-stations (BSs). We then characterize the signal-to-interference-plus-noise ratio (SINR) distribution for an arbitrary network and derive its coverage probability. To understand how varying the spatial correlation between different networks affects coverage probability, we derive special results for the two-operator scenario, where we construct the operators' individual networks from a single network via probabilistic coupling. For external validation, we devise a method to quantify and estimate spatial correlation from actual base-station deployments. We compare our two-operator model against an actual macro-cell-dominated network and an actual network primarily comprising distributed-antenna-system (DAS) nodes. Using the actual deployment data to set the parameters of our model, we observe that coverage probabilities for the model and actual deployments not only compare very well to each other, but also match nearly perfectly for the case of the DAS-node-dominated deployment. Another interesting observation is that a network that shares spectrum and infrastructure has a lower rate coverage probability than a network of the same number of BSs that shares neither spectrum nor infrastructure, suggesting that the latter is more suitable for low-rate applications.
15 citations
TL;DR: This paper introduces an optimization technique for VP precoding employing the minimum mean-square error (MMSE) criterion with per-antenna-group power constraints, and demonstrates that the MSE metric, as well as the p-norm one, can be enclosed in a proper Frobenius-norm ball.
Abstract: Recently, studies on suboptimal precoding techniques for multiple-input multiple-output broadcast channels (MIMO-BC), which achieve performance near to that of the dirty paper coding (DPC), have drawn attention to vector perturbation (VP) precoding. In practice, each antenna or more generally each antenna group has its own limit on the transmitted power, which makes per-antenna-group power constraints more meaningful than the sum power constraint. In this paper, we introduce an optimization technique for VP precoding employing the minimum mean-square error (MMSE) criterion with per-antenna-group power constraints. This technique is inspired by the p-sphere encoding in a sense that it involves finding the node with the lowest mean-square error (MSE) over a lattice. We demonstrate that the MSE metric, as well as the p-norm one, can be enclosed in a proper Frobenius-norm ball. This Frobenius-norm ball shrinks until it captures the perturbing vector minimizing the MSE. Numerical results show that the proposed algorithm outperforms conventional VP precoding and the p-sphere encoding, but at higher complexity. Consequently, we investigate a couple of simplified techniques employing the MMSE criterion, which perform almost as well as the proposed precoding technique, but are less complex.
15 citations
Cites background from "4G: LTE/LTE-Advanced for Mobile Bro..."
...…Witold A. Krzymień, Senior Member, IEEE Abstract—Recently, studies on suboptimal precoding techniques for multiple-input multiple-output broadcast channels (MIMO-BC), which achieve performance near to that of the dirty paper coding (DPC), have drawn attention to vector perturbation (VP) precoding....
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