Patent ID: 8374262
Filing Date: 2013-02-12
Classification: H04L

Abstract:
1. A method for determining an unabbreviated channel-impulse response in an OFDM transmission system, of which a duration is greater than a length of a guard interval, comprising: a first estimating of a channel-transmission factor from pilot symbols received at frequency-time positions of a relatively-coarse frequency-time raster; interpolating the channel-transmission factor at frequency-time positions of a relatively-fine frequency-time raster; calculating the unabbreviated channel-impulse response with an inverse Fourier transform from the estimated or interpolated values of the channel-transmission factor at the frequency-time positions of the relatively-fine frequency-time raster; estimating transmitted symbols with a decision from received symbols; and a second estimating of optimized estimated values of the channel-transmission factor from the received symbols and the estimated transmitted symbols.