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
More filters
01 Dec 2011
TL;DR: A novel complexity reduction technique is presented that reduces the computational complexity with a factor equal to the order of the Kalman filter, which equals the number of uplink (UL) users.
Abstract: The paper presents an algorithm for on-line estimation of the intra- and inter-cell interference in the enhanced uplink (EUL) of the wideband code division multiple access (WCDMA) cellular system. The proposed Kalman filter estimator builds on measurements of the total wideband power of the WCDMA uplink, in combination with measurements of the powers of the dedicated physical control channels (DPCCH) that are available e.g. for power control purposes. In particular the paper presents a novel complexity reduction technique that reduces the computational complexity with a factor equal to the order of the Kalman filter. This order equals the number of uplink (UL) users. Simulation results show that the performance loss associated with the complexity reduction is insignificant.
18 citations
17 May 2009
TL;DR: A novel, low complexity, robust cell search scheme for LTE that is robust against Doppler spread and phase shifts due to sampling time instant mismatch, which makes it suitable for use in synchronized LTE TDD systems, as well as in high speed scenarios like high speed trains.
Abstract: Mobility handling and performance is of major importance for the 3GPP Long Term Evolution (LTE) system. Therefore it is important for mobile devices to use reliable and robust algorithms for the cell search procedure, i.e. the procedure to detect neighbouring cells that can be used as potential handover candidates. We present a novel, low complexity, robust cell search scheme for LTE. The scheme uses a non-coherent approach and is therefore robust against Doppler spread and phase shifts due to sampling time instant mismatch, which makes it suitable for use in synchronized LTE TDD systems, as well as in high speed scenarios like high speed trains. This paper describes the theory behind the algorithm, and simulation results for LTE TDD showing its superior performance over coherent cell search algorithms are also presented.
18 citations
Cites background from "3G Evolution : HSPA and LTE for Mob..."
...For a more in-depth description we refer to [2] as well as to the 3GPP Evolved UTRAN standardization documents [1]....
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...For a comprehensive introduction to LTE and its standardization we refer to [2]...
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28 Jun 2009
TL;DR: The analysis shows that feedback delay leads to significant degradation at medium and high signal-to-noise ratios (SNR) and whether linear minimum mean squared error (MMSE) prediction can achieve the required behavior in ρ.
Abstract: Adaptive transmit beamforming based on channel state information (CSI) is a key feature in next generation wireless cellular systems. However, CSI available for adaptation is imperfect due to feedback delay and estimation errors. In this work, we analyze the outage performance of maximum eigen-mode beamforming with imperfect CSI. First we analyze the outage probability in terms of the correlation coefficient ρ between the CSI available at the transmitter (CSIT) and the CSI available at the receiver (CSIR). The analysis shows that feedback delay leads to significant degradation at medium and high signal-to-noise ratios (SNR). Furthermore, the effect of delay can be overcome only if ρ tends to one with increasing SNR. Then, we study whether linear minimum mean squared error (MMSE) prediction can achieve the required behavior in ρ. The length of the prediction filter required is numerically evaluated and shown to increase with SNR. Finally, the asymptotic diversity order is analyzed as a function of the rate at which 1 − ρ approaches 0 as the SNR → ∞. Results show that for 1 − ρ proportional to SNR−1, the asymptotic diversity order remains unaltered.
18 citations
Cites background from "3G Evolution : HSPA and LTE for Mob..."
...I. INTRODUCTION Adaptive Multiple Input Multiple Output (MIMO) transmission based on the Channel State Information (CSI) is a key feature incorporated in next generation cellular systems like 3GPP LTE and 3GPP LTE-advanced [1] to improve performance....
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...INTRODUCTION Adaptive Multiple Input Multiple Output (MIMO) transmission based on the Channel State Information (CSI) is a key feature incorporated in next generation cellular systems like 3GPP LTE and 3GPP LTE-advanced [1] to improve performance....
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TL;DR: This paper derives tractable ergodic rate approximation of both the macro-cell and small-cell users which are shown to match well with the Monte Carlo results and proposes new interference coordination algorithms that require only a few additional statistical CSI.
Abstract: In this paper, we investigate the inter-tier interference coordination for a heterogeneous network (HetNet), where both macro and small cells work in the frequency-division duplexing mode and share the same spectrum. A 2-D large-scale antenna array is deployed at a macro-base station (BS), while conventional multiple antenna array is deployed at each small cell. First, we derive an approximation of macro-users’ signal-to-interference-plus-noise ratio (SINR), under the assumption of only statistical channel-state information (CSI) at macro-BS, and a 3-D beamforming transmission scheme is applied for macro-users. A lower-bound of small-cell users’ expected SINR is also derived using the property of complex Wishart matrix. Based on these, simple metrics are derived to measure the inter-tier interference. Then, new interference coordination algorithms are proposed to achieve a good tradeoff for the performance and traffic between macro-cells and small cells. The proposed algorithms require only a few additional statistical CSI. Moreover, we derive tractable ergodic rate approximation of both the macro-cell and small-cell users which are shown to match well with the Monte Carlo results.
18 citations
14 Oct 2011
TL;DR: This work designs a LTE downlink scheduling scheme and resource allocation strategy which is not only to achieve the system highest performance, but also avoid latency and starvation problem.
Abstract: Long term evolution (LTE) is the next generation wireless system. There are not many researches for LTE downlink scheduling. It uses orthogonal frequency division multiple access (OFDMA) in downlink. Until now, the goal for the LTE scheduler is achieving the system highest performance, but it will cause to lower priority connection delay or starvation under limited bandwidth resources. Therefore, we design a LTE downlink scheduling scheme and resource allocation strategy which are not only to achieve the system highest performance, but also avoid latency and starvation problem.
18 citations
Cites background from "3G Evolution : HSPA and LTE for Mob..."
...The Bandwidth Requirement Allocation allocates the resource according to the total bandwidth and the demanded upper bound and lower bound bandwidth....
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