Patent ID: 6088327
Filing Date: 2000-07-11
Classification: H04L

Abstract:
Method for improving reception in the transmission of digital signals comprising the steps of:decomposing the digital signals into symbols of duration T.sub.s ;assigning a guard interval to each symbol;distributing the symbols over N different carrier frequencies;taking the Fourier transform of the transmitted signal in a receiver wherein after sampling of the signal;multiplying with time windows of width M.sub.1 *T.sub.s, where M.sub.1 is greater than 1, takes place and the length of the Fourier transform is M.sub.1 *N in the receiver for the transmitter symbols;defining new symbols of duration M.sub.1 *T.sub.s ;forming the new symbols from the transmitter symbols and a fraction of the guard intervals;determining the current maximum useful length of the guard intervals in order to make it possible for the length of the guard-interval fractions used for forming the new symbols to be matched adaptively to the transmission conditions, and calculating every M.sub.1 -th coefficient by the Fourier transform.