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Author: Ahmad El-Qurneh Publisher: ISBN: Category : Interpolation Languages : en Pages : 80
Book Description
"For its key role in achieving high data rates, the need to develop a low-complexity channel estimator is one of the main targets in the Long-Term Evolution (LTE) research development. With high-mobility users in LTE-Orthogonal Frequency Division Multiplexing (LTE-OFDM) systems, channel estimator design becomes a challenging problem, since the estimator needs to estimate more channel parameters than in slow fading channels, which may make the channel estimation impractical. A low-complexity channel estimator is developed for LTE high-mobility systems based on the Piecewise Linear (PWL) model and the channel time-frequency correlation relationships. The channel estimator and interpolator is tested under different LTE channel models for various mobile velocities and showed an improvement in the Bit Error Rate (BER) performance from 6% to 2% compared to the conventional linear interpolation technique with only 33.2% increase in the required processing time for a doppler frequency of 300 Hz. The proposed interpolation technique is insensitive to the change in the mobile velocity to some extent; this makes the channel estimator more practical and robust to any change in the channel statistics."--Page ii.
Author: Ahmad El-Qurneh Publisher: ISBN: Category : Interpolation Languages : en Pages : 80
Book Description
"For its key role in achieving high data rates, the need to develop a low-complexity channel estimator is one of the main targets in the Long-Term Evolution (LTE) research development. With high-mobility users in LTE-Orthogonal Frequency Division Multiplexing (LTE-OFDM) systems, channel estimator design becomes a challenging problem, since the estimator needs to estimate more channel parameters than in slow fading channels, which may make the channel estimation impractical. A low-complexity channel estimator is developed for LTE high-mobility systems based on the Piecewise Linear (PWL) model and the channel time-frequency correlation relationships. The channel estimator and interpolator is tested under different LTE channel models for various mobile velocities and showed an improvement in the Bit Error Rate (BER) performance from 6% to 2% compared to the conventional linear interpolation technique with only 33.2% increase in the required processing time for a doppler frequency of 300 Hz. The proposed interpolation technique is insensitive to the change in the mobile velocity to some extent; this makes the channel estimator more practical and robust to any change in the channel statistics."--Page ii.
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: 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: Franz Hlawatsch Publisher: Academic Press ISBN: 0080922724 Category : Technology & Engineering Languages : en Pages : 457
Book Description
As a result of higher frequencies and increased user mobility, researchers and systems designers are shifting their focus from time-invariant models to channels that vary within a block. Wireless Communications Over Rapidly Time-Varying Channels explains the latest theoretical advances and practical methods to give an understanding of rapidly time varying channels, together with performance trade-offs and potential performance gains, providing the expertise to develop future wireless systems technology. As well as an overview of the issues of developing wireless systems using time-varying channels, the book gives extensive coverage to methods for estimating and equalizing rapidly time-varying channels, including a discussion of training data optimization, as well as providing models and transceiver methods for time-varying ultra-wideband channels. - An introduction to time-varying channel models gives in a nutshell the important issues of developing wireless systems technology using time-varying channels - Extensive coverage of methods for estimating and equalizing rapidly time-varying channels, including a discussion of training data optimization, enables development of high performance wireless systems - Chapters on transceiver design for OFDM and receiver algorithms for MIMO communication channels over time-varying channels, with an emphasis on modern iterative turbo-style architectures, demonstrates how these important technologies can optimize future wireless systems
Author: JoonBeom Kim Publisher: ISBN: 9781109870985 Category : Languages : en Pages : 129
Book Description
Finally, for vertical Bell Laboratories layered space-time OFDM systems, we propose an iterative channel estimator based on a PSAM structure for time-varying multipath fading channels. By exploiting the statistical properties of a wireless channel, we also develop a method to suppress intercarrier interference due to the channel time selectivity, and propose a low-complexity iterative channel estimator that exploits a priori information in an efficient manner.
Author: Lajos Hanzo Publisher: John Wiley & Sons ISBN: 0470686693 Category : Technology & Engineering Languages : en Pages : 708
Book Description
MIMO-OFDM for LTE, WIFI and WIMAX: Coherent versus Non-Coherent and Cooperative Turbo-Transceivers provides an up-to-date portrayal of wireless transmission based on OFDM techniques augmented with Space-Time Block Codes (STBCs) and Spatial-Division Multiple Access (SDMA). The volume also offers an in-depth treatment of cutting-edge Cooperative Communications. This monograph collates the latest techniques in a number of specific design areas of turbo-detected MIMO-OFDM wireless systems. As a result a wide range of topical subjects are examined, including channel coding and multiuser detection (MUD), with a special emphasis on optimum maximum-likelihood (ML) MUDs, reduced-complexity genetic algorithm aided near-ML MUDs and sphere detection. The benefits of spreading codes as well as joint iterative channel and data estimation are only a few of the radical new features of the book. Also considered are the benefits of turbo and LDPC channel coding, the entire suite of known joint coding and modulation schemes, space-time coding as well as SDM/SDMA MIMOs within the context of various application examples. The book systematically converts the lessons of Shannon's information theory into design principles applicable to practical wireless systems; the depth of discussions increases towards the end of the book. Discusses many state-of-the-art topics important to today's wireless communications engineers. Includes numerous complete system design examples for the industrial practitioner. Offers a detailed portrayal of sphere detection. Based on over twenty years of research into OFDM in the context of various applications, subsequently presenting comprehensive bibliographies.
Author: Meik Dörpinghaus Publisher: Springer Science & Business Media ISBN: 3642197809 Category : Technology & Engineering Languages : en Pages : 317
Book Description
This volumes discusses various aspects regarding the capacity/achievable data rate of stationary Rayleigh fading channels. First, it analyses bounds on the achievable data rate with zero-mean proper Gaussian input symbols, which are capacity achieving in the coherent case, i.e., in case of perfect channel knowledge at the receiver. These bounds are tight in the sense that the difference between the upper and the lower bound is bounded for all SNRs. The lower bound converges to the coherent capacity for asymptotically small channel dynamics. Furthermore, these bounds are extended to the case of multiple-input multiple-output (MIMO) channels and to the case of frequency selective channels. In a further part, the present work studies the achievable rate with receivers based on synchronized detection and a code-aided channel estimation. For a specific type of such a receiver an approximate upper bound on the achievable rate is derived. The comparison of this approximate upper bound and the achievable data rate with receivers using synchronized detection based on a solely pilot based channel estimation gives an approximate upper bound on the possible gain by using this kind of code-aided channel estimation in comparison to the conventional receiver using a solely pilot based channel estimation. In addition, the achievable data rate with an optimal joint processing of pilot and data symbols is studied and a lower bound on the achievable rate for this case is derived. In this context, it is also shown which part of the mutual information of the transmitter and the receiver is discarded when using the conventional receiver with synchronized detection based on a solely pilot based channel estimation.
Author: Feifei Gao Publisher: Springer ISBN: 3319116681 Category : Computers Languages : en Pages : 85
Book Description
This SpringerBrief presents channel estimation strategies for the physical later network coding (PLNC) systems. Along with a review of PLNC architectures, this brief examines new challenges brought by the special structure of bi-directional two-hop transmissions that are different from the traditional point-to-point systems and unidirectional relay systems. The authors discuss the channel estimation strategies over typical fading scenarios, including frequency flat fading, frequency selective fading and time selective fading, as well as future research directions. Chapters explore the performance of the channel estimation strategy and optimal structure of training sequences for each scenario. Besides the analysis of channel estimation strategies, the book also points out the necessity of revisiting other signal processing issues for the PLNC system. Channel Estimation of Physical Layer Network Coding Systems is a valuable resource for researchers and professionals working in wireless communications and networks. Advanced-level students studying computer science and electrical engineering will also find the content helpful.
Author: Ahmad El-Qurneh
Author: Ahmad El-Qurneh
Author: Kahsay Kiross
Author: Kahsay Meresa
Author: Franz Hlawatsch
Author: Mo Zhu
Author: 
Author: JoonBeom Kim
Author: Lajos Hanzo
Author: Meik Dörpinghaus
Author: Feifei Gao