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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TL;DR: This paper forms an optimal power allocation problem for the asynchronous scenario of the system where different cells work independently, and observes that the problem is non-convex and NP-hard, but can be converted to Geometric Programming problems and solved by interior-point methods.
Abstract: This paper considers the power allocation problem in a relay-assisted Time-Division-Duplex-based multiple-cell system. In such a system, the achievable data rate of each user is not only coupled with those of others due to the inherent dynamic spatial frequency reuse therein, but also coupled between consecutive time slots due to the required two-hop transmission, which results in the so-called "spatial-coupling" and "time-coupling" nature, respectively. To address both of the two coupling effects in a relay assisted TDD cellular system, we formulate an optimal power allocation problem for the asynchronous scenario of the system where different cells work independently. We observe that the problem is non-convex and NP-hard, but can be converted to Geometric Programming (GP) problems and solved by interior-point methods. In case there is no central controller and/or massive information exchange among cells is prohibitive, game theory is employed to derive the distributed solutions. Finally, we validate the proposed algorithms by extensive simulations.
4 citations
Dissertation•
13 Aug 2010
TL;DR: In this paper, the authors study some PAPR (Peak-to-Average Power Ratio) reduction methods applied to the downlink of the WiMAX standard using a simulator based on the IEEE 802.16-2009.
Abstract: In this work we study some PAPR (Peak-to-Average Power Ratio) reduction methods, which are applied to the downlink of the WiMAX standard using a simulator based on the IEEE 802.16-2009. The methods analyzed here are clipping, the use of correction functions, dummy sequence insertion, active constellation extension and partial transmit sequences. These methods are also combined with the goal of combating more e ciently the e ects of nonlinear distortions on the ampli ed OFDM signals. Besides the combination of the di erent methods, we propose a modi cation in the Gatherer and Polley method(dummy sequence insertion) by adding power on the data subchannels speci ed in IEEE 802.16-2009. The original method uses the null subcarriers to reduce the PAPR. With the proposed modi cation we may use the null subcarriers and the data subcarriers in given subchannels, as well as a combination of them. In order to analyze the PAPR reducing methods several metrics were evaluated, such as the power spectral density, the PAPR cumulative distribution function, the bit error rate, the error vector magnitude, the ratio between the transmission channel power and the adjacent channel power, the throughput and implementation complexity. These metrics provide a realistic view of the performance of each method. They can be used in the choice of the PAPR reduction method most appropriate to a particular wireless communication system, in this case WiMAX.
4 citations
Cites background from "3G Evolution : HSPA and LTE for Mob..."
...Em [22], o transmissor OFDM é descrito como um conjunto de Lmoduladores, em que cada modulador corresponde a uma subportadora OFDM....
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TL;DR: An adaptive algorithm to estimate the parameters of a multifractal model in the wavelet domain to describe network traffic flows based on the adaptive estimation of the modeling parameters in order to guarantee quality of service (QoS) in LTE (Long Term Evolution) networks.
4 citations
01 Jan 2011
TL;DR: The chapters on the physical layer in this book are dedicated to the systematic design of physical layer protocols and functional blocks of 4 th generation cellular systems, the theoretical background on physical layer procedures, and performance evaluation of thephysical layer components.
Abstract: The physical layer is the lowest protocol layer in baseband signal processing that interfaces with the physical media (in this case the air interface) through which the signal is transmitted and received. The physical layer receives the MAC protocol data units and processes them through channel coding, interleaving, baseband modulation, multi-antenna encoding, precoding, resource and antenna mapping. The choice of an appropriate modulation and coding scheme, as well as multi-antenna transmission mode, is critical to achieve the desired reliability and system throughput in mobile wireless data communications. Typical mobile radio channels tend to be dispersive and time-variant and exhibit severe Doppler effects, multipath delay variation, intra-cell and inter-cell interference, and fading. A good and robust design of the physical layer ensures that the system can normally operate and overcome the above deleterious effects, and can provide the maximum throughput and lowest latency under various operating conditions. The chapters on the physical layer in this book are dedicated to the systematic design of physical layer protocols and functional blocks of 4 th generation cellular systems, the theoretical background on physical layer procedures, and performance evaluation of the physical layer components. The theoretical background is provided to make the book self-contained, and to ensure that the reader understands the basic theory behind the operation of various functional blocks and procedures.
4 citations
01 Jan 2014
TL;DR: Throughput model has been obtained using this simulation that was used to test the QoS parameters for voice/video in LTE network throughput for data traffic, and the measured qualitativelyQoS parameters determine the resulting quality services from the perspective of end user perception.
Abstract: This paper deals with studying the effects of performance LTE network throughput for data traffic. Utilisation rate of networks has a significant impact on the quality parameters of triple play services. LTE network was simulated by the software module additionally implemented in a development environment MATLAB. Throughput model has been obtained using this simulation that was used to test the QoS parameters for voice/video. Voice and video data streams using different codecs are transmitted for the obtained throughput. The measured qualitatively QoS parameters determine the resulting quality services from the perspective of end user perception.
4 citations