Optimal Pilot and Fast Algorithm for MIMO-OFDM Channel Estimation

In this paper, a class of unitary transform based optimal pilots is found for time domain channel estimation in multiple input multiple output (MIMO) orthogonal frequency division multiplexing (OFDM) systems. Also, a frequency domain channel estimation which does not need interpolation is obtained. It is shown that the frequency domain method achieves the same performance as the time domain method and is better than interpolation methods. Furthermore, fast algorithms are proposed to implement the methods. Simulations demonstrate that the methods are effective