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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TL;DR: Simulation results show that the derived upper bound and approximation are quite accurate and thus provide an analytical approach to quantify the SIR performance of coherent JT.
Abstract: The analysis of the success probability or signal-to-interference ratio (SIR) distribution for coherent joint transmission (JT) based on stochastic geometry is an open issue. In this letter, we study coherent JT in downlink heterogeneous cellular networks and provide an upper bound of the success probability for the general user and the worst-case user (cell-corner user), and an approximation for the general user. Simulation results show that the derived upper bound and approximation are quite accurate and thus provide an analytical approach to quantify the SIR performance of coherent JT.
18 citations
01 Apr 2012
TL;DR: This paper proposes Extended Synchronization Signals (ESS) to eliminate the unavoidable physical cell identity (PCI) confusion problem in dense heterogeneous LTE deployments and shows a handover delay reduction of 65% can be realized.
Abstract: Heterogeneous long term evolution (LTE) networks evolve as a possible solution to accommodate the exponential growth of mobile data. However, the heterogeneity introduces several design challenges such as increasing interference and mobility overhead. In this paper, we propose Extended Synchronization Signals (ESS) to eliminate the unavoidable physical cell identity (PCI) confusion problem in dense heterogeneous LTE deployments. The ESS is also designed to reduce signaling overhead and handover delay. Our analysis shows a handover delay reduction of 65% can be realized. Additionally, we show that PCI confusion probability can be practically eliminated in case of centralized planning and a reduction of five order of magnitude in confusion probability can be attained in case of distributed planning.
18 citations
Cites background or methods from "4G: LTE/LTE-Advanced for Mobile Bro..."
...Both PSS and SSS are based on Zadoff–Chu (ZC) sequences [4]....
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...- total handover messages propagation delay, denoted as dl, required for message propagation in between the serving 3It is worth noting that the MIB and SIB are transmitted several times within their TTIs....
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...Other SIB (SIB2-SIB13) contains other relevant information and are typically transmitted at longer TTIs [4]....
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23 Jul 2014
TL;DR: A prediction model based on Random Neural Networks for objective, non-intrusive prediction of video quality over LTE for video applications with an approximate 50% increase in accuracy using this model, compared to previous models.
Abstract: Long Term Evolution (LTE) is the preliminary version of a fourth generation (4G) mobile communication system Its aim is to support different services with high data rates and strict Quality of Experience (QoE) requirements of users The main aim of this study is to present a prediction model based on Random Neural Networks (RNNs) for objective, non-intrusive prediction of video quality over LTE for video applications A three layer feed-forward RNN model with gradient descent training algorithm has been developed This model uses a combination of objective parameters in the application and network layers, such as Content Type (CT), Sender Bit Rate (SBR), resolution size, Frame Rate (FR), codec, and packet loss rate (PLR) The video quality was predicted in terms of the Mean Opinion Score (MOS) The results show an approximate 50% increase in accuracy using this model, compared to previous models LTE-Sim software has been used to generate different samples for testing and training RNN model
18 citations
05 Oct 2015
TL;DR: This paper proposes near-capacity multi-user bit-interleaved coded modulation with iterative demapping (MU-BICM-ID) scheme for two-user Gaussian multiple-access channel (GMAC), especially for high spectral efficiency scenarios.
Abstract: In 5th generation (5G) wireless communication networks, non-orthogonal multiple access (NOMA) is a key technique for supporting massive connectivity and high spectral efficiency. In NOMA systems, the signals sent by multiple users are superimposed at the receiver, which is a multiple access channel (MAC) in information-theoretic perspective. In this paper, we propose near-capacity multi-user bit-interleaved coded modulation with iterative demapping (MU-BICM-ID) scheme for two-user Gaussian multiple-access channel (GMAC), especially for high spectral efficiency scenarios. To retrieve the shaping loss, we suggest to use amplitude phase shift keying (APSK) constellation instead of conventional quadrature amplitude modulation (QAM) constellation. Furthermore, we disclose the fact that the low-density parity-check (LDPC) code optimized for point-to-point is not suitable for GMAC, and therefore we propose and optimize Raptor-like LDPC code for GMAC. Via extrinsic information transfer (EXIT) chart analysis as well as bit-error rate (BER) simulation, we illustrate the near-capacity performance of the proposed scheme.
18 citations
Cites background from "4G: LTE/LTE-Advanced for Mobile Bro..."
...Hence, the throughput of such NOMA system is mainly restricted by I(X1,X2;Y ), which is named sum-rate capacity....
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...In the past years, many practical NOMA schemes have been proposed and studied....
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...However, as a key technique in 5G, non-orthogonal multiple access (NOMA) has gained a lot of attentions in both academic and industrial circles due to its higher spectral efficiency comparing to OMA [3]–[5]....
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...long term evolution (LTE), the multiple access is based on orthogonal multiple access (OMA) [2], e....
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...In previous generation of wireless communication networks, e.g. long term evolution (LTE), the multiple access is based on orthogonal multiple access (OMA) [2], e.g. time-division multiple access (TDMA), orthogonal frequency division multiple access (OFDMA), etc....
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TL;DR: Based on the existing digital MFH infrastructure, the proposed scheme can significantly improve the capacity and sensitivity in the PAM-4-based compressed digital FMH as discussed by the authors, which can achieve capacity gains from 30% to 68%, sensitivity improvement of 2-9dB, and significant EVM improvements are demonstrated experimentally, comparing with other compressed CPRI MFH solutions.
Abstract: The standardization and development of LTE-A and 5G introduced advanced wireless technologies including multiple-input multiple-output and carrier aggregation, which require multiple wireless carriers to be delivered to and from each remote radio head. The common public radio interface (CPRI) as the mainstream standard in mobile fronthaul (MFH) with on-off-keying-based optical links cannot fulfill the capacity and efficiency requirement. Instead, using compressed CPRI in a high-speed pulse-amplitude-modulation-4 (PAM-4) link is actively researched and demonstrated. In this paper, we propose and demonstrate adaptive digitization and channel coding based on these compression and capacity boosting technologies. Depending on the optical link condition, the digitization bits and channel coding rates can be adaptively and dynamically changed to achieve the lowest error vector magnitude (EVM) of wireless carriers. By separating digitization bits into high bits and low bits, the coding overhead can be different between groups, while still keeping the same bit rate per wireless carrier. Based on the existing digital MFH infrastructure, the proposed scheme can significantly improve the capacity and sensitivity in the PAM-4-based compressed digital MFH. Capacity gains from 30% to 68%, sensitivity improvement of 2–9 dB, and significant EVM improvements are demonstrated experimentally, comparing with other compressed CPRI MFH solutions.
18 citations
Cites background from "4G: LTE/LTE-Advanced for Mobile Bro..."
...tively developed and deployed to improve the performance, capacity and coverage while keeping the power consumption low [1], [2]....
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