Design of Channel Estimation and Equalization for OFDM Systems

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Februar 2015



Orthogonal Frequency Division Multiplexing (OFDM) system is one of the multicarrier techniques which is robust against Inter-symbol-Interference, multipath fading and very easy to apply in transmitters by using inverse fast Fourier transform IFFT and at the receivers by using fast Fourier transform FFT. In a communication system, channel estimation is very important issue for the data detection. In coherent detection, one of the popular techniques is to use pilot tones as a reference signal in OFDM symbols. In the comb-type pilot tones insertion, pilot tones are inserted into each OFDM symbols, but inserting a large number of pilot tones will lead to channel capacity reduction or bandwidth expansion [1-2]. In this work, to overcome this transmission loss, a modified least square (ModLS) algorithm for fast time varying wireless channel at comb-type pilot arrangement in QAM signals for OFDM system is proposed. The simulation results obtained from the proposed algorithm showed a good performance in noisy wireless channels. In addition, it has been compared with least square (LS) algorithm in different signal to noise ratios and different channel tabs.


Ali Salah Mahdi - B.Sc (2008) in Information and Communication Engineering from Al-Khwarizmi College of Engineering/University of Baghdad (Iraq) and M.Sc (2014) in communication Engineering from college of Engineering/Gaziantep University (Turkey). Published paper on ( Signal Processing and Communications Applications Conference (SIU),2013)( IEEE ) paper name:Reduced Number of Pilot in Comb-Type Pilot Arrangement by Using Modified Least Square Channel Estimation for OFDM System.
EAN: 9783659671616
ISBN: 3659671614
Untertitel: Paperback. Sprache: Englisch.
Verlag: LAP Lambert Academic Publishing
Erscheinungsdatum: Februar 2015
Seitenanzahl: 84 Seiten
Format: kartoniert
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