Channel estimation using soft-decision feedback

Details Channel estimation using soft-decision feedback Channel estimation using soft-decision feedback

H - Electricity

04

L

H04L 1/20 (2006.01) H04L 25/02 (2006.01) H04Q 7/34 (2006.01)

Patent

CA 2269580

A method of estimating channel impulse response in a signal transmitted over a channel in a communication system is described. The channel estimator obtains a priori knowledge about the transmitted signal and then use the transmitted signal and the a priori knowledge to choose an estimate of channel impulse response which minimises the expected distance between the transmitted signal and a reconstructed signal. The expected distance that is minimised is a cost function; represented by E{¦¦r-Bh¦¦2r).. By using soft decision feedback, the invention minimises erroneous decision feedback which can cause error propagation. The decision are usually in the form of log likelihood ratios (LLR).

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