A method for noise rise estimation in a wireless communication system, said method comprising the step of: receiving radio signals intended for a plurality of users, characterized by the further steps of: performing an interference whitening on said received radio signals based on one of GRAKE, GRAKE+ and chip equalizer with respect to a first user of said plurality of users; determining a useful signal power for said first user after said interference whitening for a plurality of time instances; deriving a first user noise floor compensation factor based on combining weights for said first user used in said interference whitening; estimating a probability distribution for a compensated useful signal power for said first user from at least said determined useful signal power for said first user and said first user noise floor compensation factor; computing a conditional probability distribution of a noise floor measure based on at least said determined useful signal power for said first user and said first user noise floor compensation factor; and calculating a noise rise measure for said first user, based at least on said compensated useful signal power for said first user and said conditional probability distribution of a noise floor measure. receiving radio signals intended for a plurality of users, characterized by the further steps of: performing an interference whitening on said received radio signals based on one of GRAKE, GRAKE+ and chip equalizer with respect to a first user of said plurality of users; determining a useful signal power for said first user after said interference whitening for a plurality of time instances; deriving a first user noise floor compensation factor based on combining weights for said first user used in said interference whitening; estimating a probability distribution for a compensated useful signal power for said first user from at least said determined useful signal power for said first user and said first user noise floor compensation factor; computing a conditional probability distribution of a noise floor measure based on at least said determined useful signal power for said first user and said first user noise floor compensation factor; and calculating a noise rise measure for said first user, based at least on said compensated useful signal power for said first user and said conditional probability distribution of a noise floor measure. performing an interference whitening on said received radio signals based on one of GRAKE, GRAKE+ and chip equalizer with respect to a first user of said plurality of users; determining a useful signal power for said first user after said interference whitening for a plurality of time instances; deriving a first user noise floor compensation factor based on combining weights for said first user used in said interference whitening; estimating a probability distribution for a compensated useful signal power for said first user from at least said determined useful signal power for said first user and said first user noise floor compensation factor; computing a conditional probability distribution of a noise floor measure based on at least said determined useful signal power for said first user and said first user noise floor compensation factor; and calculating a noise rise measure for said first user, based at least on said compensated useful signal power for said first user and said conditional probability distribution of a noise floor measure.