Institute of Electrical & Electronic Engineers
In this paper, the authors compare several channel estimation algorithms in the case of LTE (Long Term Evolution) System when applied in a high mobility environment. In particular, they propose a novel algorithm, based on the observation of OFDM block energy, to perform a semi-blind tracking of the channel between pilot blocks. This algorithm is compared to more traditional approaches based on 1D estimation and interpolation. In addition, an Expectation Maximization (EM) algorithm is used to improve the overall channel estimation.