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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 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: 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
Author: Kahsay Meresa
Author: Kahsay Kiross
Author: Kahsay Kiross
Author: Ahmed Mohammed Mohammed Al-Samman
Author: 
Author: Waqas Aslam Cheema
Author: Zahirul Islam
Author: 朱柏安
Author: Ankit Ashok Agarwal
Author: Daivd Lin