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We address pilot-symbol aided channel estimation (PACE) for orthogonal frequency division multiplexing (OFDM) based systems, with multiple transmit antennas. An approach is presented which estimates and separates NT superimposed signals, corresponding to NT transmit antennas, in two dimensions. More specifically, we extend the concept of using two one dimensional (1D) estimators, instead of a truly two dimensional (2D) estimator for MIMO-OFDM systems, by dividing the estimation as well as the separation task into two stages. Each estimator only separates a subset of the NT superimposed signals, together with smoothing and interpolation in the respective dimension. Design rules for the optimization of the proposed 2×1D estimator are established, dependent on the performance, computational complexity, induced delay, and overhead due to pilot symbols.
Vehicular Technology Conference, 2003. VTC 2003-Fall. 2003 IEEE 58th (Volume:2 )
Date of Conference: 6-9 Oct. 2003