Patent ID: 7218893
Filing Date: 2007-05-15
Classification: H04W

Abstract:
1. A method to identify an interference source in a mobile radio network, wherein a received signal consists of a wanted signal and a number of interference signals of which one is a dominating interference signal and where all signals include a known training sequence, said method comprising the steps of: estimating the carrier and subtracting this carrier from the received signal; forming a remaining interference signal and correlating said interference signal against known training sequences, resulting in a determined training sequence associated with the interfering signal; finding an identification code of a possible interference source from said determined training sequence; determining a number of candidates from said identification code, each of said candidates corresponding with a certain cell and the frequencies which are disturbed; determining the timing offset for the frequencies used by said candidates; and investigating if one or more of these frequencies have the same time offset as the interference signal, whereby the at least one candidate with the best offset matching of its frequencies in relation to other candidates is identified as the interference source.