Patent ID: 6411186
Filing Date: 2002-06-25
Classification: H04B

Abstract:
A delay estimation method used in a radio system comprising as a transmitter and a receiver at least one base station and a subscriber terminal, in which system signals comprise waveforms and wherein a received or preprocessed signal is sampled at a sampling frequency and wherein the mutual delays are estimated from the received signals, which originate from one or several transmitters and which have propagated typically along several paths, comprising the steps of:determining the paths on which the delays are to be estimated, determining a code bank model to be used which contains information on the waveforms used, selecting one of the determined paths at a time for delay estimation, and with respect to these paths, searching for delay estimates by solving the least squares minimization problem between the received signal and the code bank model such that the delay of only one selected path is changed at a time within a desired search interval while the delays of the other paths remain unchanged, so that delay specific minimization results are formed from said solving of the least squares minimization problem, storing the delay estimate for the path that was searched for, and utilizing said delay estimate as a constant value of said path when searching for the delays of the other paths.