A novel BEM- based channel estimation algorithm for time variant uplink OFDMA system

Authors:
Fatemeh Ganji;Vahid Tabatabavakili;Farid Samsami Khodadad;Makan Hosseinnezhad;Amin Safaei
Affiliations:
Malek Ashtar University;Iran Science and Technology University;Malek Ashtar University;Azad University, Tehran, Iran;International Campus of Sharif University of Technology
Venue:
ICACT'10 Proceedings of the 12th international conference on Advanced communication technology
Year:
2010

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Abstract

IN this paper the effect of different channel estimation approaches in OFDMA uplink system which are based on Basis Expansion Model (BEM) and widely used to consider time varying channels are discussed. It has been shown in previous works that modeling error will be reduced by applying oversampled BEM with cost of increasing sensitivity to noise. This problem will be solved by combining oversampled BEM and MMSE channel estimator with cost of increasing computational complexity. In this paper a novel channel estimation approach is represented in which by combining oversampled BEM and low rank MMSE in frequency domain, almost the same performance as the full rank MMSE has been achieved while computational complexity reduces significantly.