Abstract:

A new channel estimation based on subspace in two multiple input multiple output （MIMO-OFDM） systems is discussed. The proposed method estimates noise subspace with reduced-rank orthogonal iteration for low computational complexity. The over-sampled autocorrelation matrix is transformed by colored noise whitening. A new method to estimate colored noise covariance matrix with training sequences is developed for improving the convergence rate of channel estimation. Simulation results illustrate that the proposed method can get good performance.

Key words: multiple input multiple output, orthogonal frequency division multiplexing, channel estimation, semi-blind method