Performance Bounds for MIMO-OFDM Channel Estimation

The performance of a mobile MIMO-OFDM system de-pends on the ability of the system to accurately account for the effects of the frequency-selective time-varying channel at every symbol time and at every frequency subcarrier. In this paper, a vector formulation of the Cramer-Rao bound (CRB) for biased estimators and for functions of parame-ters is used to find a lower bound on the estimation and prediction error of such a system. Numerical simulations demonstrate the benefits of multiple antennas for channel estimation and prediction and illustrate the impact of cali-bration errors on estimation performance when using para-metric channel models. 1