This summary provides the key details about a research paper on power delay profile estimation for MIMO-OFDM systems in 3 sentences:
The paper proposes a new technique to estimate the power delay profile for linear minimum mean square error channel estimation in MIMO-OFDM systems using only pilot symbols from all transmit antennas. The technique aims to mitigate distortions caused by null subcarriers and insufficient channel impulse response samples for estimation. Simulation results showed that channel estimation using the proposed power delay profile approach performed similarly to Wiener filtering by reducing distortion effects.