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
Citations
More filters
TL;DR: This paper proposes a novel UFMC scheme, namely, UfMC-AIC, which incorporates active interference cancellation into UF MC so as to mitigate the inter-sub-band interference.
Abstract: Universal filtered multi-carrier (UFMC) is one of the enabling techniques for 5G, which supports sliced spectrum by filtering successive sub-bands. The filter design is an essential and challenging issue, which is critical to the performance of UFMC. In this paper, we propose a novel UFMC scheme, namely, UFMC-AIC, which incorporates active interference cancellation into UFMC so as to mitigate the inter-sub-band interference. A non-convex optimization problem is formulated, which aims to maximize the overall signal-to-interference-plus-noise ratio performance by adaptively optimizing the weighting factors of the interference cancellation subcarriers under the power constraints. The minorization–maximization method is applied to solve the problem in the ideal case when the sub-band states and the channel state information are perfectly known at the base station. A practical distributed solution is further obtained in a closed form by the Lagrangian dual method, which largely reduces the computational complexity with only slight performance loss compared with the ideal case. Simulation results show that our proposal with lower cost of filter can still achieve better bit error rate performance than the conventional UFMC under different carrier frequency offsets for the Rayleigh block-fading channel.
26 citations
Cites background from "4G: LTE/LTE-Advanced for Mobile Bro..."
...1In the LTE systems, every 12 consecutive subcarriers in frequency domain is called a resource block (RB) [36]....
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Patent•
21 May 2013TL;DR: In this paper, the authors propose an apparatus consisting of a baseband signal processing block, processing circuitry, and at least one radio frequency (RF) communication module communicably coupled to the BS and configured to communicate using a selected mode of communication in a channel.
Abstract: An apparatus includes a baseband signal processing block, processing circuitry, and at least one radio frequency (RF) communication module communicably coupled to the baseband signal processing block and configured to communicate using a selected mode of communication in a channel. The processing circuitry is configured to detect a sub-channel band of unavailable spectrum within the channel, the band of unavailable spectrum being less than a whole of the channel. The channel includes one contiguous band of frequencies divisible into at least two non-overlapping non-adjacent sub-channels. The processing circuitry is configured to select one mode of communication selected from a plurality of modes including: a carrier aggregation (CA) only mode, a multiple input multiple output (MIMO) only mode, and a carrier aggregation multiple input multiple output (CA-MIMO) hybrid mode.
26 citations
01 Dec 2014
TL;DR: Simulation results show that IA with frequency-clustering achieves a significant sum rate increase compared to CR systems with orthogonal multiple access transmission techniques.
Abstract: In this paper, we investigate the resource management problem in orthogonal frequency division multiplexing (OFDM) based multiple-input multiple-output (MIMO) cognitive radio (CR) systems. We propose performing resource allocation based on interference alignment (IA) in order to improve the spectral efficiency of CR systems without affecting the quality of service of the primary system. IA plays a role in the proposed algorithm to enable the secondary users (SUs) to cooperate and share the available spectrum, which leads to a considerable increase in the spectral efficiency of CR systems. However, IA based spectrum sharing is restricted to a certain number of SUs per subcarrier in order to satisfy the IA feasibility conditions. Accordingly, the resource allocation problem is formulated as a mixed-integer optimization problem, which is considered an $\mathcal{NP}$ -hard problem. To reduce the computational complexity of the problem, a two-phases efficient sub-optimal algorithm is proposed. In the first phase, frequency-clustering is performed in order to satisfy the IA feasibility conditions, where each subcarrier is assigned to a feasible number of SUs. Whenever possible, frequency-clustering stage considers the fairness among the SUs. In the second stage, the available power is allocated among the subcarriers and SUs without violating the constraints that limit the maximum interference induced to the primary system. Simulation results show that IA with frequency-clustering achieves a significant sum rate increase compared to CR systems with orthogonal multiple access transmission techniques.
26 citations
TL;DR: This paper examines the underlying issues behind IDM and proposes a framework which aims to achieve the identification of Things and their safe management and aims to open a research debate which will help to solve the future IoT IDM issues in healthcare applications.
Abstract: The Internet of Things (IoT) in healthcare and medical applications promises to solve many problems which are currently challenging the sector, ranging from remotely caring for our aging population to medical discoveries on incurable diseases. However, the challenges and risks of having 50 billion Things and users connected together are complex and may be detrimental to control. Concerns have been raised in relation to the IoT Identification Management (IDM) issues, in which each Thing (user and device) will be required to have a unique identity, and the IDM to be able to distinguish between a device and user, as well as ensuring identity and information context safety. This paper examines the underlying issues behind IDM and proposes a framework which aims to achieve the identification of Things and their safe management. The IDM framework is embedded in Mobile Ad Hoc Networks (MANETs) and assumes that most healthcare devices will be linked wirelessly and in mobile environments. The paper aims to open a research debate which will help to solve the future IoT IDM issues in healthcare applications.
26 citations
Cites background from "4G: LTE/LTE-Advanced for Mobile Bro..."
...introduced in China may have potential for carrying the required communications volume, or 4G LTE (an evolution of the GSM/UMTS standards) may offer the true upgrade potential for the future [31] although it must be noted that current public networks were not designed for IoT real-time applications....
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Proceedings Article•
01 Feb 2017TL;DR: Borders on the maximum number of bits that can be transmitted within given bandwidth, latency, and reliability constraints are obtained, using an orthogonal frequency-division multiplexing system similar to LTE.
Abstract: Future autonomous systems require wireless connectivity able to support extremely stringent requirements on both latency and reliability. In this paper, we leverage recent developments in the field of finite-blocklength information theory to illustrate how to optimally design wireless systems in the presence of such stringent constraints. Focusing on a multi-antenna Rayleigh block-fading channel, we obtain bounds on the maximum number of bits that can be transmitted within given bandwidth, latency, and reliability constraints, using an orthogonal frequency-division multiplexing system similar to LTE. These bounds unveil the fundamental interplay between latency, bandwidth, rate, and reliability. Furthermore, they suggest how to optimally use the available spatial and frequency diversity. Finally, we use our bounds to benchmark the performance of an actual coding scheme involving the transmission of short packets.
26 citations