Channel Estimation for Wavelet Based OFDM System

Author

Gupta, Mahesh Kumar ; Shrivastava, Sarika ; Raghuvanshi, A.S. ; Tiwari, S.

fYear

2011

fDate

24-25 Feb. 2011

Firstpage

1

Lastpage

4

Abstract

Orthogonal frequency division multiplexing (OFDM) is multi carrier modulation scheme. The channel estimation is a process of characterizing the effect of the transmission channel on the input signal. In this paper we compare the performance of Least Square (LS) and Linear Minimum Mean Square Error (LMMSE) channel estimation technique for Wavelet based OFDM system. The channel estimation based on block type pilot arrangement is performed by sending pilots at every sub-channel and using this estimation for a specific number of following symbols. In this paper we used wavelet transform instead of fast Fourier transform (FFT), which have more bandwidth efficiency, less prone to Doppler shift and also complexity of order O(N) as opposed to the FFTs O(N log₂ N).

Keywords

OFDM modulation; channel estimation; least mean squares methods; wavelet transforms; Doppler shift; FFT; LMMSE channel estimation technique; LS channel estimation technique; block-type pilot arrangement; fast Fourier transform; least square channel estimation technique; linear minimum mean square error channel estimation technique; multicarrier modulation scheme; orthogonal frequency division multiplexing; transmission channel; wavelet transform; wavelet-based OFDM system; Bit error rate; Channel estimation; Discrete wavelet transforms; Fading; OFDM;

fLanguage

English

Publisher

ieee

Conference_Titel

Devices and Communications (ICDeCom), 2011 International Conference on

Conference_Location

Mesra

Print_ISBN

978-1-4244-9189-6

Type

conf

DOI

10.1109/ICDECOM.2011.5738465

Filename

5738465