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
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01 Aug 2010
TL;DR: This paper provides a discussion on the LTE radio-access technology as defined in 3GPP, with specific focus on its TDD component (TD-LTE).
Abstract: This paper provides a discussion on the LTE radio-access technology as defined in 3GPP, with specific focus on its TDD component (TD-LTE). Some specific characteristics of TDD, such as interference between uplink and downlink as well as channel reciprocity, are outlined. A discussion on possible evolution paths for the TD-LTE radio-access technology is also presented. Finally, an overview of the performance and capabilities of TD-LTE, in relation to the requirements on IMT-Advanced, is provided.
11 citations
Cites background from "3G Evolution : HSPA and LTE for Mob..."
...Some specific characteristics of TDD, such as interference between uplink and downlink as well as channel reciprocity, are outlined....
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TL;DR: The linear minimum mean-squared error channel estimator for systems employing per-subcarrier transmit antenna selection is developed and theoretical asymptotic performances of the two estimators used with the proposed correlation model are proved.
Abstract: The linear minimum mean-squared error (MSE) channel estimator for systems employing per-subcarrier transmit antenna selection is developed. Frequency domain correlations after the selection process are shown to be approximated well using a simple function, which makes near-optimal channel estimation practically possible. However, the resultant estimators are not robust to errors in the assumed model, in terms of the antenna-to-subcarrier assignment used at transmission, as we motivate both analytically and via simulations. This is an issue when the channels for conveying this information to the receiver are severely constrained. We present windowed channel estimations and new robust estimation algorithms, either individually or in combination, as solutions to counter this sensitivity. The robust estimators are developed based on the principles of 1) minimising the worst case MSE over the set of possible models and 2) minimising the expected MSE over the set of possible models. The latter estimator is preferred due to the lower implementation complexity and better MSE performance. We also prove theoretical asymptotic (in signal-to-noise ratio) performances of the two estimators used with the proposed correlation model. Simulation results illustrate the performance gains and improved robustness offered by the developed estimators.
11 citations
Cites background from "3G Evolution : HSPA and LTE for Mob..."
...11n [5] and LTE [6], the pilots are sometimes precoded in the same way as the data....
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31 Oct 2013
TL;DR: The MTC and its challenges are introduced with a focus on its use in the healthcare domain and the Random Access procedure (RACH) used in Long Term Evolution (LTE) cellular networks is explained in order to address the issue of RACH overload coming from massive number of MTC devices.
Abstract: Machine Type Communication (MTC) is an essential service for next generation cellular networks. Because of the massive number of communicating devices, MTC poses great challenges for Radio Access Network (RAN). This is mainly caused by the overloading problem that has been aggressively addressed by 3GPP as an essential working item. Because of this overloading problem, classical Human to Human (H2H) communications may be negatively affected. In this paper we first introduce the MTC and its challenges with a focus on its use in the healthcare domain. The Random Access procedure (RACH) used in Long Term Evolution (LTE) cellular networks will be then explained in order to address the issue of RACH overload coming from massive number of MTC devices. To resolve RAN overload, 3GPP and others have proposed several RAN solutions. We evaluate and compare these solutions and conclude finally with their advantages and weaknesses in order to select the best solution for an operator.
10 citations
31 Oct 2015
TL;DR: Results show that for multimedia flow, FLS scheme outperforms other five schemes in terms of packet delay, packet loss ratio, and average throughput, whereas for best-effort flow, EXP-PF scheme shows better average throughput performance on average as compared with other algorithms being considered herein.
Abstract: Long Term Evolution (LTE) mobile network aims to support high speed network services even in highmobility scenarios. To achieve this goal, LTE adopts some advanced features in Radio Resource Management (RRM) procedures. Among them, LTE packet scheduling plays a fundamental role in maximising system performance. In this paper, a comparative analysis on the performances of Proportional Fair (PF), Exponential/Proportional Fair (EXP/PF), Exponential (EXP) Rule, MaximumLargest Weighted Delay First (M-LWDF), Logarithmic (LOG) Rule and Frame Level Scheduler (FLS) LTE downlink packet scheduling algorithms is reported. Performance is evaluated in single cell with interference environment while increasing user number and user speed. Results show that for multimedia flow, FLS scheme outperforms other five schemes in terms of packet delay, packet loss ratio, and average throughput, whereas for best-effort flow, EXP-PF scheme shows better average throughput performance on average as compared with other algorithms being considered herein.
10 citations
Cites background from "3G Evolution : HSPA and LTE for Mob..."
...The smallest unit of RB which corresponds to one OFDM subcarrier during one symbol interval is called Resource Element (RE) [9]....
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Journal Article•
TL;DR: The detailed design of three different MIMO-OFDM SDM systems on FPGA-based DSP Development Kit is shown and the BER performance of the systems is measured and evaluated and the results have shown that the design and implementation are successful.
Abstract: A combination of Multiple-Input Multiple-Output Spatial Division Multiplexing technology and Orthogonal Frequency Division Multiplexing technique, namely MIMO-OFDM SDM systems, has been well-known as a potential technology to provide high speed data transmission and spectrum e fficiency for modern wireless communications networks. Many technical papers have been evaluated the systems ba sed on theory analyses and/or computer simulation, but just few ones have investigated the systems based on FPGA design, which is an important step before going to manufac ture the integrated circuits. In the paper, we present our own design a nd implementation of three different MIMO-OFDM SDM systems on FPGA-based DSP Development Kit. Based on the design, we evaluate the bit-error rate performance of the systems and also consider the consumption of the FPGA elements in our design. The results have shown our successful des ign and implementation of the systems on FPGA hardware. CONCLUSIONS MIMO-OFDM SDM technology has been considered a candidate for high speed wireless data transmission net works because of its significant increase of channel capa city and use of spectrum efficiently. In the paper, we have investigated the systems based on hardware design and implementation. We have shown our detailed design of three differ ent systems on the FPGA-based DSP Development Kit. Based on the design, we have measured and evaluated BER performance of the systems. The results have shown that our design and implementation are successful. Here, we also considered the consumption of FPGA elements. It has shown the efficiency of our d esign.
10 citations
Cites background from "3G Evolution : HSPA and LTE for Mob..."
...11, 3GPP Long Term Evolution, and WiMAX [1-5]....
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