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Toward real-time adaptive low-rank LMMSE channel estimation of MIMO-OFDM systems

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3 Author(s)
Ozdemir, M.K. ; Dept. of EECS, Syracuse Univ., NY ; Arslan, H. ; Arvas, E.

For the practical LMMSE channel estimation of MIMO-OFDM systems, the high computational complexity of LMMSE needs to be eliminated. In this study, we develop a low-complexity, generalized low-rank LMMSE channel estimator for MIMO-OFDM systems using comb-type pilots. The estimator utilizes the relationship between the subspaces of the frequency domain channels at the pilots and non-pilots subcarriers. By using subspace tracking, it is observed that practical LMMSE channel estimation of MIMO-OFDM systems can be feasible

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Wireless Communications, IEEE Transactions on  (Volume:5 ,  Issue: 10 )