Title :
(Reduced number of pilot in comb-type pilot arrangement by using modified least square channel estimation for OFDM system)
Author :
Mahdi, A.S. ; Ercelebi, E.
Author_Institution :
Bilgi ve Iletisim Muhendisligi Bolumu, Baghdad Univ., Baghdad, Iraq
Abstract :
A modified least square algorithm (MLS) for wireless channel estimation at comb-type pilot arrangement in QAM signals for OFDM system is presented. The proposed algorithm aims to reduce number of pilot tones in each OFDM symbol because insert more pilot symbols lead to bandwidth expansion or data rate reduction [1-2]. The simulation results for MLS algorithm showed a good performance in noisy wireless channel and the performances of the presented technique and LS have been compared with different SNR as well as measuring bit error rate verses signal to noise ratio with 4-QAM as a modulation schemes.
Keywords :
OFDM modulation; channel estimation; error statistics; least mean squares methods; quadrature amplitude modulation; wireless channels; MLS; OFDM system; QAM signal; bandwidth expansion; bit error rate; comb-type pilot arrangement; data rate reduction; least square algorithm; modulation scheme; noisy wireless channel; signal-to-noise ratio; wireless channel estimation; Channel estimation; Discrete Fourier transforms; Least squares approximations; OFDM; Quadrature amplitude modulation; Signal to noise ratio; Wireless communication; LS algorithm; MLS algorithm; OFDM; channel estimation;
Conference_Titel :
Signal Processing and Communications Applications Conference (SIU), 2013 21st
Conference_Location :
Haspolat
Print_ISBN :
978-1-4673-5562-9
Electronic_ISBN :
978-1-4673-5561-2
DOI :
10.1109/SIU.2013.6531233
