| 摘要 |
<p>The invention relates to a delay estimation method and a receiver in a radio system. The signals originate from one or several transmitters and they have propagated along several paths. In the method, one of the determined paths (73 - 77) is selected at a time for estimation. The least squares minimization problem between the received signal and the code bank model is solved path by path (73 - 77) and delay by delay. In such a case, when the minimization results are formed, the delay of only one selected path is changed at a time while the delays of the other paths (73 - 77) remain unchanged. The minimization results are used to search for a delay for which the minimized result is at most equal to the results for the other delays. This delay is stored and used as the constant value of the path (73 - 77) when the delays of the other paths are searched for. The method can be repeated if necessary. The method has the advantage that it provides the delays of all the paths (73 - 77) of all the users simultaneously without information on the user symbols or the attenuation coefficients of the channel.</p> |
