Maximally Robust 2-D Channel Estimation for OFDM Systems with Finite Number of Pilots
In practical transmission scenarios, where channel correlation functions are not known or cannot be easily estimated, it is desirable to have an estimator that is robust to mismatches between the assumed and the actual channel correlation function. This paper deals with the analysis of various channel estimation techniques for wireless Orthogonal Frequency Division Multiplexing (OFDM) systems with finite number of pilot observations. Channel estimation is important for wireless applications due to the fading characteristics of the channel and the time-varying nature of wireless channel adds additional cost in the estimator design. The challenge is to make the estimator maximally robust.