Book•
3G Evolution : HSPA and LTE for Mobile Broadband
31 Jul 2007-
TL;DR: In this paper, the authors present a very up-to-date and practical book, written by engineers working closely in 3GPP, gives insight into the newest technologies and standards adopted by threeGPP with detailed explanations of the specific solutions chosen and their implementation in HSPA and LTE.
Abstract: This very up-to-date and practical book, written by engineers working closely in 3GPP, gives insight into the newest technologies and standards adopted by 3GPP, with detailed explanations of the specific solutions chosen and their implementation in HSPA and LTE. The 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 HSPA and LTE implementation are given. An overview of other related systems such as TD SCDMA, CDMA2000, and WIMAX is also provided.This is a 'must-have' resource for engineers and other professionals working with cellular or wireless broadband technologies who need to know how to utilize the new technology to stay ahead of the competition.The authors of the book all work at Ericsson Research and are deeply involved in 3G 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 both HSPA and LTE within 3GPP. * Gives the first explanation of the radio access technologies and key international standards for moving to the next stage of 3G evolution: fully operational mobile broadband* Describes the new technologies selected by the 3GPP to realise High Speed Packet Access (HSPA) and Long Term Evolution (LTE) for mobile broadband * Gives both higher-level overviews and detailed explanations of HSPA and LTE as specified by 3GPP
Citations
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21 Mar 2011
TL;DR: A novel module developed for the simulation of the LTE technology with the ns-3 simulator focuses mainly on modeling the E-UTRA part of the system, with a particular attention on the aspects related to the channel, PHY and MAC layers.
Abstract: In this paper, we present a novel module developed for the simulation of the LTE technology with the ns-3 simulator. It focuses mainly on modeling the E-UTRA part of the system, with a particular attention on the aspects related to the channel, PHY and MAC layers. First we discuss the overall modeling assumptions according to which the module was designed. Subsequently, we describe in detail the architecture of the module and its components. Finally, we discuss an example simulation scenario.
192 citations
Patent•
15 Sep 2006TL;DR: In this article, the authors proposed a method of transmitting and receiving radio access information that allows a faster and an efficient way of establishing a radio connection between a terminal and a target base station while performing a handover for the terminal to a cell of the target BS.
Abstract: In a wireless mobile communications system, a method of transmitting and receiving radio access information that allows a faster and an efficient way of establishing a radio connection between a terminal and a target base station while performing a handover for the terminal to a cell of the target base station. The network transmits in advance, the radio access information and the like, to the terminal so that the terminal can be connected with the target cell in a faster manner which minimizes the total time for the handover process.
188 citations
TL;DR: This work proposes a parametric sparse estimation technique based on finite rate of innovation (FRI) principles for MIMO communications, which is a generalization of conventional spectral estimation methods to multiple input signals with common support.
Abstract: We consider the problem of estimating sparse communication channels in the MIMO context. In small to medium bandwidth communications, as in the current standards for OFDM and CDMA communication systems (with bandwidth up to 20 MHz), such channels are individually sparse and at the same time share a common support set. Since the underlying physical channels are inherently continuous-time, we propose a parametric sparse estimation technique based on finite rate of innovation (FRI) principles. Parametric estimation is especially relevant to MIMO communications as it allows for a robust estimation and concise description of the channels. The core of the algorithm is a generalization of conventional spectral estimation methods to multiple input signals with common support. We show the application of our technique for channel estimation in OFDM (uniformly/contiguous DFT pilots) and CDMA downlink (Walsh-Hadamard coded schemes). In the presence of additive white Gaussian noise, theoretical lower bounds on the estimation of sparse common support (SCS) channel parameters in Rayleigh fading conditions are derived. Finally, an analytical spatial channel model is derived, and simulations on this model in the OFDM setting show the symbol error rate (SER) is reduced by a factor 2 (0 dB of SNR) to 5 (high SNR) compared to standard non-parametric methods - e.g. lowpass interpolation.
188 citations
TL;DR: This paper presents a comprehensive survey of the RRM schemes that have been studied in recent years for LTE/LTE-A HetNets, with a particular focus on those for femtocells and relay nodes.
Abstract: As heterogeneous networks (HetNets) emerge as one of the most promising developments toward realizing the target specifications of Long Term Evolution (LTE) and LTE-Advanced (LTE-A) networks, radio resource management (RRM) research for such networks has, in recent times, been intensively pursued Clearly, recent research mainly concentrates on the aspect of interference mitigation Other RRM aspects, such as radio resource utilization, fairness, complexity, and QoS, have not been given much attention In this paper, we aim to provide an overview of the key challenges arising from HetNets and highlight their importance Subsequently, we present a comprehensive survey of the RRM schemes that have been studied in recent years for LTE/LTE-A HetNets, with a particular focus on those for femtocells and relay nodes Furthermore, we classify these RRM schemes according to their underlying approaches In addition, these RRM schemes are qualitatively analyzed and compared to each other We also identify a number of potential research directions for future RRM development Finally, we discuss the lack of current RRM research and the importance of multi-objective RRM studies
187 citations
Cites background from "3G Evolution : HSPA and LTE for Mob..."
...3) Link Adaptation: Link adaptation is another essential RRM function located at the MAC layer to achieve high user throughput performance with a given target block error rate [39]....
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TL;DR: This work considers MU detectors and channel estimators, with varying algorithm complexity, and shows that low-complexity algorithms provide the best tradeoff, even though more receiver iterations are needed to reach a desired performance.
Abstract: A family of iterative receivers is evaluated in terms of complexity and performance for the case of an uplink multi-user (MU) multiple-input multiple-output orthogonal frequency division multiplexing (MIMO-OFDM) system. The transmission over block fading channels is considered. The analyzed class of receivers is performing channel estimation inside the iterative detection loop, which has been shown to improve estimation performance. As part of our results we illustrate the ability of this type of receiver to reduce the required amount of pilot symbols. A remaining question to ask is which combinations of estimation and detection algorithms that provide the best trade-off between performance and complexity. We address this issue by considering MU detectors and channel estimators, with varying algorithm complexity. For MU detection, two algorithms based on parallel interference cancellation (PIC) are considered and compared with the optimal symbol-wise maximum a-posteriori probability (MAP) detector. For channel estimation, an algorithm performing joint minimum-mean-square-error (MMSE) estimation is considered along with a low complexity replica making use of a Krylov subspace method. An estimator based on the space alternating generalized expectation-maximization (SAGE) algorithm is also considered. Our results show that low-complexity algorithms provide the best tradeoff, even though more receiver iterations are needed to reach a desired performance.
187 citations
Cites background or methods from "3G Evolution : HSPA and LTE for Mob..."
...More explicitly, the data structures are given by: r = (r[1],....
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...J Ketonen, M Juntti, J Cavallaro, Performance—complexity comparison of receivers for a LTE MIMO-OFDM system....
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...A technology that has become popular in later years, and also found its way into many wireless standards such as, e.g., LTE [1], is the use of multiple-input multiple-output (MIMO) antenna systems in combination with orthogonal frequency division multiplexing (OFDM)....
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...where Ξ̂ has the same structure as Ξ, but contains both known pilot symbols and soft estimates of the transmitted data carrying symbols; Δ = diag(θ) + σ 2 wINMS, with θ = (θ[1],....
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..., LTE [1], is the use of multiple-input multiple-output (MIMO) antenna systems in combination with orthogonal frequency division multiplexing (OFDM)....
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