Channel estimation for OFDM systems with multiple transmit antennas by filtering in time and frequency
- 1 January 2003
- conference paper
- Published by Institute of Electrical and Electronics Engineers (IEEE)
- Vol. 2, 1204-1208 Vol.2
- https://doi.org/10.1109/vetecf.2003.1285213
Abstract
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 N/sub T/ superimposed signals, corresponding to N/sub T/ 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 N/sub T/ superimposed signals, together with smoothing and interpolation in the respective dimension. Design rules for the optimization of the proposed 2/spl times/1D estimator are established, dependent on the performance, computational complexity, induced delay, and overhead due to pilot symbols.Keywords
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