Maximum likelihood sequence estimation for orthogonal frequency division multiplexing (OFDM) transmissions over unknown multipath fading channels is analytically infeasible for lack of efficient methods to maximize the likelihood function. A practical solution to this problem has been recently proposed in the context of space–time block-coded OFDM by resorting to the expectation–maximization (EM) algorithm. The resulting detector operates iteratively, exploiting knowledge of the channel statistics and the operating signal-to-noise ratio (SNR). In this work, we address the problem of estimating the above quantities and propose a recursive solution based on ad hoc reasoning. Simulations indicate that the EM detector employing the estimated SNR and channel statistics has better performance than other schemes operating in a mismatched mode. Also, the performance loss with respect to a system with perfect channel knowledge is negligible at SNR values of practical interest.
|Autori:||Morelli M; Sanguinetti L|
|Titolo:||Estimation of Channel Statistics for Iterative Detection of OFDM Signals|
|Anno del prodotto:||2005|
|Digital Object Identifier (DOI):||10.1109/TWC.2005.850263|
|Appare nelle tipologie:||1.1 Articolo in rivista|