An improved performance OFDM channel estimation using pilot-symbol-aided technique
Other Title(s)
تحسين جودة تقييم القناة في نظام التقسيم الترددي المتعدد التعامدي باستخدام الرموز التجريبية
Dissertant
Thesis advisor
Comitee Members
al-Matarnah, Asir Muhammad Zayid
al-Zubi, Khalid Qasim
Siyam, Muhammad Zakariyya
University
Mutah University
Faculty
Faculty of Engineering
Department
Electrical Engineering Department
University Country
Jordan
Degree
Master
Degree Date
2015
English Abstract
Orthogonal Frequency Division Multiplexing (OFDM) provides an effective and low complexity means of eliminating inter-symbol interference over frequency selective fading channels.
OFDM received a lot of interest in mobile communication research, as radio channel is usually a time variant and frequency selective.
The objective of this thesis is to improve channel estimation accuracy in OFDM system, because channel state information is needed for signal detection at the receiver, consequently, its accuracy affects the overall performance of the system.
In practice, CSI can be reliably estimated at the receiver by transmitting pilot symbols along with data symbols.
Pilot symbol assisted channel estimation is especially attractive for wireless channel, where the channel is time-varying.
In this thesis, various efficient pilot assisted channel estimation schemes were investigated and compared for OFDM system.
Two major types of pilot arrangements, namely, block type and comb-type have been focused on this thesis.
Block type pilot subcarriers, is particularly suitable for slow-fading radio channels, whereas, comb-type pilots arrangement exhibit better resistance to fast fading channels.
The choice of channel estimation is of fundamental importance in OFDM receiver designs, which further involves a trade-off between complexity and estimation accuracy.
There are several methods for the estimation of the channel, namely; Least Square (LS), Minimum Mean Square Error and Modified Minimum Mean Square Error (LMMSE).
The mathematical model for each of these estimators was derived and their performance was investigated on MATLAB.
The results showed clearly that LS algorithm gives less complexity compared with MMSE and LMMSE but LMMSE algorithm provides comparatively better results.
A one dimensional (1-D) and two dimensional (2-D) pilot symbol assisted channel estimators for OFDM systems are simulated also for comparison purpose, The performance of the 2-D channel estimator is much better than that of the 1-D channel estimator of Mean Square Error (MSE) as a function of signal-to-noise ratio (SNR).
Results showed that as the number of pilot symbols increases, the MSE decreases (i.e, improved performance).
Main Subjects
Telecommunications Engineering
No. of Pages
54
Table of Contents
Table of contents.
Abstract.
Abstract in Arabic.
Chapter One : Introduction.
Chapter Two : Wireless multipath propagation channel.
Chapter Three : Orthogonal frequency division multiplexing.
Chapter Four : Pilot-symbol-aided channel estimator, simulation results, conclusion and future work.
References.
American Psychological Association (APA)
al-Tarawinah, Anwar Yusuf. (2015). An improved performance OFDM channel estimation using pilot-symbol-aided technique. (Master's theses Theses and Dissertations Master). Mutah University, Jordan
https://search.emarefa.net/detail/BIM-677665
Modern Language Association (MLA)
al-Tarawinah, Anwar Yusuf. An improved performance OFDM channel estimation using pilot-symbol-aided technique. (Master's theses Theses and Dissertations Master). Mutah University. (2015).
https://search.emarefa.net/detail/BIM-677665
American Medical Association (AMA)
al-Tarawinah, Anwar Yusuf. (2015). An improved performance OFDM channel estimation using pilot-symbol-aided technique. (Master's theses Theses and Dissertations Master). Mutah University, Jordan
https://search.emarefa.net/detail/BIM-677665
Language
English
Data Type
Arab Theses
Record ID
BIM-677665
