Wavelet domain channel estimation for multiband OFDM UWB communications

Author

Sajad Sadough, S.M. ; Jaffrot, Emmanuel ; Duhamel, Pierre

Author_Institution

UEI, ENSTA, Paris, France

fYear

2006

fDate

4-8 Sept. 2006

Firstpage

1

Lastpage

5

Abstract

This paper presents a receiver that combines semi-blind channel estimation with the decoding process for multiband OFDM UWB communications. We particularly focus on reducing the number of estimated channel coefficients by taking advantage of the sparsity of UWB channels in the wavelet domain. The EM algorithm is used to estimate the channel without any need to pilot symbols inside the data frame. Channel estimation performance is enhanced by integrating a thresholding/denoising scheme within the EM algorithm leading at the same time to a reduction of the estimator complexity. Simulation results using IEEE UWB channel models show 3 dB of SNR improvement at a BER of 10^-3 compared to training sequence based channel estimation.

Keywords

OFDM modulation; channel coding; channel estimation; decoding; expectation-maximisation algorithm; radio receivers; ultra wideband communication; wavelet transforms; BER; EM algorithm; IEEE UWB channel models; UWB channel sparsity; decoding process; denoising scheme; estimator complexity reduction; multiband OFDM UWB communications; radio receiver; semiblind channel estimation; thresholding scheme; wavelet domain channel estimation; Abstracts; Channel estimation; Decoding; Estimation; Noise; Ultra wideband communication; Wavelet domain;

fLanguage

English

Publisher

ieee

Conference_Titel

Signal Processing Conference, 2006 14th European

Conference_Location

Florence

ISSN

2219-5491

Type

conf

Filename

7071231