Method and system for channel estimation using iterative estimation and detection

摘要

The invention provides a method and system for a modified Expectation Maximization (EM) algorithm that enables a detector to perform relatively accurate channel estimates on blocks of data that include relatively short training sequences in wireless communication signals. Channel re-estimation is simplified by transferring the estimation calculations from the time domain into a channel state domain. Semi-blind detection methods are employed to combine information obtained from known training sequence and unknown data to improve channel estimates. The modified EM algorithm's pre-calculated low-dimensional matrix inversion reduces a detector's demands on processing resources.