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Author: Ankit Ashok Agarwal Publisher: ISBN: Category : Languages : en Pages :
Book Description
Channel estimation is an important part for the design of receivers in mobile communication systems. In order to recover the transmitted information correctly, the effect of the channel on the transmitted signal must be correctly estimated. In this thesis, the pilot based channel estimation algorithms for 3GPP LTE downlink is studied. Channel estimation algorithms such as Least Square (LS), Minimum Mean Square Error (MMSE) and Modified MMSE (M-MMSE) channel estimation algorithm have been evaluated for LTE downlink 5 MHz bandwidth configuration. The performance of these algorithms for Block type and Comb type pilot arrangement has been measured in terms of Bit Error Rate (BER). For Comb type pilot arrangement, the performance of Linear Interpolation (LI), Spline Cubic Interpolation (SCI) and Low Pass Interpolation (LPI) methods have been compared. Though higher order interpolation is used for better interpolation accuracy, the improvement in performance is not proven for all cases and for some cases Linear Interpolation can give better performance. For cases when the subcarrier spacing is very small compared to the coherence bandwidth which is a result of small delay spread, Linear Interpolation can give better performance in terms of BER. The ITU outdoor to indoor and pedestrian test environment channel model A, which has a small R.M.S. delay spread of 45 ns, has been used for all simulations. The performance of Comb type pilot arrangement with different pilot spacing has also been compared.
Author: Ankit Ashok Agarwal Publisher: ISBN: Category : Languages : en Pages :
Book Description
Channel estimation is an important part for the design of receivers in mobile communication systems. In order to recover the transmitted information correctly, the effect of the channel on the transmitted signal must be correctly estimated. In this thesis, the pilot based channel estimation algorithms for 3GPP LTE downlink is studied. Channel estimation algorithms such as Least Square (LS), Minimum Mean Square Error (MMSE) and Modified MMSE (M-MMSE) channel estimation algorithm have been evaluated for LTE downlink 5 MHz bandwidth configuration. The performance of these algorithms for Block type and Comb type pilot arrangement has been measured in terms of Bit Error Rate (BER). For Comb type pilot arrangement, the performance of Linear Interpolation (LI), Spline Cubic Interpolation (SCI) and Low Pass Interpolation (LPI) methods have been compared. Though higher order interpolation is used for better interpolation accuracy, the improvement in performance is not proven for all cases and for some cases Linear Interpolation can give better performance. For cases when the subcarrier spacing is very small compared to the coherence bandwidth which is a result of small delay spread, Linear Interpolation can give better performance in terms of BER. The ITU outdoor to indoor and pedestrian test environment channel model A, which has a small R.M.S. delay spread of 45 ns, has been used for all simulations. The performance of Comb type pilot arrangement with different pilot spacing has also been compared.
Author: Kahsay Meresa Publisher: Lulu.com ISBN: 136558125X Category : Technology & Engineering Languages : en Pages : 104
Book Description
In this thesis channel estimation techniques for LTE downlink named Least Square, Minimum Mean Square error and Maximum Likelihood estimation techniques are studied for the pilot symbol based channel estimation. In addition to this the performances of these three channel estimation techniques were also studied by introducing averaging, interpolation and hybrid methods.This work also investigates the complexity of the channel estimation techniques in terms of the number of complex multiplications and by varying the FFT size and number of CP(cyclic prefix). furthermore, the effect of varying the number of antennas at the transmitter and receiver ends, where 2 x 2 and 4 x 4 antenna arrangements are considered as a case studies. The performance of these channel estimation techniques is also studied for EVA standard channel model in LTE. The considered channel model is EVA standard channel model with Doppler shift of 300HZ.
Author: Kahsay Kiross Publisher: GRIN Verlag ISBN: 3668365709 Category : Technology & Engineering Languages : en Pages : 101
Book Description
Thesis (M.A.) from the year 2016 in the subject Engineering - Communication Technology, grade: 75%, Mekelle University, course: Communication engineering, language: English, abstract: In this thesis channel estimation techniques for LTE downlink named Least Square, Minimum Mean Square error and Maximum Likelihood estimation techniques are studied for the pilot symbol based channel estimation. In addition to this the performances of these three channel estimation techniques were also studied by introducing averaging, interpolation and hybrid methods. This work also investigates the complexity of the channel estimation techniques in terms of the number of complex multiplications and by varying the FFT size and number of CP. furthermore, the effect of varying the number of antennas at the transmitter and receiver ends, where 2 x 2 and 4 x 4 antenna arrangements are considered as a case studies. The performance of these channel estimation techniques is also studied for EVA standard channel model in LTE. The considered channel model is EVA standard channel model with Doppler shift of 300HZ. Simulation results in this thesis show that the ML channel estimation technique has the best performance. In terms of number of complex multiplications it is proved the ML has lower complexity. From the interpolating techniques it is shown the performance of the algorithm integrated with hybrid technique has the best performance. In addition to this it is shown that as the number of transmit and receive antennas increase from 2 x 2 to 4 x 4 the performance of the estimator increases.
Author: Waqas Aslam Cheema Publisher: LAP Lambert Academic Publishing ISBN: 9783838372464 Category : Languages : en Pages : 96
Book Description
The focus of this book is to evaluate the channel estimation and equalization for OFDM based LTE downlink according to 3GPP specifications. This book presents a link level system model that is used in simulation of LTE downlink physical layer which is valid for bandwidth 5, 10, 15 and 20MHz. Furthermore, the ITU standard channel models for UMTS and LTE including SISO and MIMO channel models are described. Finally, the channel estimation algorithms are presented for both SISO and MIMO systems. The concluding results are being presented with the help of simulation. The Performance is measured in terms of BER and SER and the obtained results are compared with the theoretical values.
Author: Vincenzo Malta Publisher: LAP Lambert Academic Publishing ISBN: 9783844307931 Category : Long-Term Evolution (Telecommunications) Languages : en Pages : 108
Book Description
Orthogonal Frequency Division Modulation (OFDM) is the modulation employed by the LTE downlink physical layer. Recent studies on pilot-aided channel estimation, show that assuming a parametric channel model can effectively improve the estimate accuracy. The algorithms based on this model perform the frequency response estimation of a multipath environment through the knowledge of the tap-delay parameters. This work focuses on the estimation of the number of delays, required by the tap-delay estimators. For this purpose the state-of-the-art detection scheme is investigated over a static and a dynamic channel. Furthermore, it is compared with an approach based on a simple threshold operation. It s shown that over the static channel, MDL exhibits a certain robustness against the time observation reduction, while the Threshold algorithm suffers from a signi cant increase in the estimate s error. Tests over the dynamic channel show a general performances decrement. However MDL average error doesn t drastically get worse as the Threshold one. The state-of-the-art performances then, are not exceeded, but the noticed problems still leave this topic open.
Author: Markus Rupp Publisher: Springer ISBN: 9811006172 Category : Technology & Engineering Languages : en Pages : 383
Book Description
This book introduces the Vienna Simulator Suite for 3rd-Generation Partnership Project (3GPP)-compatible Long Term Evolution-Advanced (LTE-A) simulators and presents applications to demonstrate their uses for describing, designing, and optimizing wireless cellular LTE-A networks. Part One addresses LTE and LTE-A link level techniques. As there has been high demand for the downlink (DL) simulator, it constitutes the central focus of the majority of the chapters. This part of the book reports on relevant highlights, including single-user (SU), multi-user (MU) and single-input-single-output (SISO) as well as multiple-input-multiple-output (MIMO) transmissions. Furthermore, it summarizes the optimal pilot pattern for high-speed communications as well as different synchronization issues. One chapter is devoted to experiments that show how the link level simulator can provide input to a testbed. This section also uses measurements to present and validate fundamental results on orthogonal frequency division multiplexing (OFDM) transmissions that are not limited to LTE-A. One chapter exclusively deals with the newest tool, the uplink (UL) link level simulator, and presents cutting-edge results. In turn, Part Two focuses on system-level simulations. From early on, system-level simulations have been in high demand, as people are naturally seeking answers when scenarios with numerous base stations and hundreds of users are investigated. This part not only explains how mathematical abstraction can be employed to speed up simulations by several hundred times without sacrificing precision, but also illustrates new theories on how to abstract large urban heterogeneous networks with indoor small cells. It also reports on advanced applications such as train and car transmissions to demonstrate the tools’ capabilities.
Author: Houman Zarrinkoub Publisher: John Wiley & Sons ISBN: 1118443454 Category : Technology & Engineering Languages : en Pages : 513
Book Description
An introduction to technical details related to the Physical Layer of the LTE standard with MATLAB® The LTE (Long Term Evolution) and LTE-Advanced are among the latest mobile communications standards, designed to realize the dream of a truly global, fast, all-IP-based, secure broadband mobile access technology. This book examines the Physical Layer (PHY) of the LTE standards by incorporating three conceptual elements: an overview of the theory behind key enabling technologies; a concise discussion regarding standard specifications; and the MATLAB® algorithms needed to simulate the standard. The use of MATLAB®, a widely used technical computing language, is one of the distinguishing features of this book. Through a series of MATLAB® programs, the author explores each of the enabling technologies, pedagogically synthesizes an LTE PHY system model, and evaluates system performance at each stage. Following this step-by-step process, readers will achieve deeper understanding of LTE concepts and specifications through simulations. Key Features: • Accessible, intuitive, and progressive; one of the few books to focus primarily on the modeling, simulation, and implementation of the LTE PHY standard • Includes case studies and testbenches in MATLAB®, which build knowledge gradually and incrementally until a functional specification for the LTE PHY is attained • Accompanying Web site includes all MATLAB® programs, together with PowerPoint slides and other illustrative examples Dr Houman Zarrinkoub has served as a development manager and now as a senior product manager with MathWorks, based in Massachusetts, USA. Within his 12 years at MathWorks, he has been responsible for multiple signal processing and communications software tools. Prior to MathWorks, he was a research scientist in the Wireless Group at Nortel Networks, where he contributed to multiple standardization projects for 3G mobile technologies. He has been awarded multiple patents on topics related to computer simulations. He holds a BSc degree in Electrical Engineering from McGill University and MSc and PhD degrees in Telecommunications from the Institut Nationale de la Recherche Scientifique, in Canada. www.wiley.com/go/zarrinkoub
Author: Ankit Ashok Agarwal
Author: Ankit Ashok Agarwal
Author: Kahsay Meresa
Author: Kahsay Kiross
Author: Waqas Aslam Cheema
Author: Kahsay Kiross
Author: Zahirul Islam
Author: Vincenzo Malta
Author: Markus Rupp
Author: Ahmed Mohammed Mohammed Al-Samman
Author: Houman Zarrinkoub