A method of complexity reduced noise floor estimation in a wireless communications system, said method further comprising: determining, for a respective k of at least a subset of a plurality of power grid points, a product of complementary cumulative distribution functions, each said complementary cumulative distribution function corresponding to a respective j of a plurality of provided wideband power measure estimates in a sliding window; determining, for each of said at least subset of power grid points, a probability distribution function of a minimum of said plurality of wideband power measure estimates based on said determined product; and determining a mean value over said subset of power grid points of said determined probability distribution function to provide a noise floor estimate, wherein said product of complementary cumulative distribution functions is calculated over said plurality of wideband power estimates N PowerSamples according to: ∏ j = 1 N PowerSamples 1 − F PowerSamples j k where j denotes the index of one of said provided power measure estimates and k denotes the index of said plurality of power grid points, and F PowerSample ( j, k) comprises said cumulative distribution function; and wherein said probability distribution f min (P k) for each of said plurality of power grid points P k is calculated according to f min P k = ∑ i = 1 N PowerSample f PowerSample i k 1 − F PowerSample i k ∏ j = 1 N PowerSample 1 − F PowerSample j k where f Powersample(i,k) is the probability distribution function of the i:th of said provided power measure estimates, and 1-F PowerSample (i,k) represents the complementary cumulative distribution function of the i:th of said provided power measure estimates. determining, for a respective k of at least a subset of a plurality of power grid points, a product of complementary cumulative distribution functions, each said complementary cumulative distribution function corresponding to a respective j of a plurality of provided wideband power measure estimates in a sliding window; determining, for each of said at least subset of power grid points, a probability distribution function of a minimum of said plurality of wideband power measure estimates based on said determined product; and determining a mean value over said subset of power grid points of said determined probability distribution function to provide a noise floor estimate, wherein said product of complementary cumulative distribution functions is calculated over said plurality of wideband power estimates N PowerSamples according to: ∏ j = 1 N PowerSamples 1 − F PowerSamples j k where j denotes the index of one of said provided power measure estimates and k denotes the index of said plurality of power grid points, and F PowerSample ( j, k) comprises said cumulative distribution function; and wherein said probability distribution f min (P k) for each of said plurality of power grid points P k is calculated according to f min P k = ∑ i = 1 N PowerSample f PowerSample i k 1 − F PowerSample i k ∏ j = 1 N PowerSample 1 − F PowerSample j k where f Powersample(i,k) is the probability distribution function of the i:th of said provided power measure estimates, and 1-F PowerSample (i,k) represents the complementary cumulative distribution function of the i:th of said provided power measure estimates.