Title :
A novel BEM- based channel estimation algorithm for time variant uplink OFDMA system
Author :
Ganji, Fatemeh ; Tabatabavakili, Vahid ; Khodadad, Farid Samsami ; Hosseinnezhad, Makan ; Safaei, Amin
Author_Institution :
Malek Ashtar Univ., Tehran, Iran
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.
Keywords :
channel estimation; frequency division multiple access; least mean squares methods; time-varying channels; basis expansion model; channel estimation; computational complexity; minimum mean square error methods; orthogonal frequency division multiple access; time variant uplink OFDMA system; Channel estimation; Computational complexity; Fading; Frequency conversion; Frequency domain analysis; Frequency estimation; Interference; OFDM; Random processes; Scattering; Basis Expansion Model (BEM); Channel estimation; MMSE; OFDMA; Time varying channel;
Conference_Titel :
Advanced Communication Technology (ICACT), 2010 The 12th International Conference on
Conference_Location :
Phoenix Park
Print_ISBN :
978-1-4244-5427-3