Multicarrier systems
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorsNongji Chen, Robert Barnard Heaton
Life of this patent
Estimating the term…
Abstract
In an OFDM receiver the complex values of predetermined pilot sub-carriers are compared with expected values to determine pilot distortion values for those sub-carriers. The phases of the differences between successive values are determined, and then the rate at which these phases change with respect to sub-carrier frequency is determined. Data distortion estimates for other sub-carriers can be calculated by interpolation of the pilot distortion values such that the data distortion estimates have a phase which substantially complies with the determined rate.
Claims12
A method of estimating the transfer function of a channel carrying a multicarrier signal using a receiver which derives complex values from respective sub-carriers of the signal, wherein the complex values of at least some sub-carriers are compared with predetermined values to determine distortion values for those sub-carriers, the method including the step of determining the rate at which the phase of the difference between the distortion values varies with sub-carrier frequency.
A multicarrier receiver having means arranged to perform a method as claimed in any preceding claim.
Dependencies are inferred from the claim text.