Title :
Channel Estimation for Frequency-Domain Equalization of Single-Carrier Broadband Wireless Communications
Author :
Zheng, Yahong Rosa ; Xiao, Chengshan
Author_Institution :
Dept. of Electr. & Comput. Eng., Missouri Univ. of Sci. & Technol., Rolla, MO
Abstract :
Frequency-domain equalization (FDE) is an effective technique for high-data-rate wireless communication systems suffering from very long intersymbol interference. Most of the existing FDE algorithms are limited to slow time-varying fading channels due to the lack of an accurate channel estimator. In this paper, we employ an interpolation method to propose new algorithms for frequency-domain channel estimation for both slow and fast time-varying fading. We show that least squares (LS)-based channel estimation and minimum mean square (MMSE)-based channel estimation with interpolations are equivalent under certain conditions. Noise variance estimation and channel equalization in the frequency domain are also discussed with fine-tuned formulas. Numerical examples indicate that the new algorithms perform very well for severe fading channels with long delay spread and high Doppler spread. It is also shown that our new algorithms outperform the recently developed frequency-domain least mean squares (LMS) and recursive LS (RLS) algorithms which are capable of dealing with moderate fading channels.
Keywords :
broadband networks; channel estimation; equalisers; fading channels; frequency-domain analysis; intersymbol interference; least mean squares methods; radiocommunication; time-varying channels; Doppler spread; fast time-varying fading; frequency-domain channel estimation; frequency-domain equalization; frequency-domain least mean squares; interpolation method; intersymbol interference; least squares based channel estimation; minimum mean square based channel estimation; single-carrier broadband wireless communications; slow time-varying fading channels; Broadband wireless communications; channel equalization; channel estimation; frequency-domain channel equalization;
Journal_Title :
Vehicular Technology, IEEE Transactions on
DOI :
10.1109/TVT.2008.925298