A method in a communication terminal for estimating noise in a multicarrier communication system such that the multicarrier communication system is based on orthogonal frequency division multiplexing, OFDM, technology, wherein communication in the multicarrier communication system is carried out over a plurality of subcarriers, comprising: receiving multicarrier symbols, the multicarrier symbols including pilot signals and the multicarrier symbols are OFDM symbols; obtaining (S101a) cell pilot frequency data of each of the pilot signals based on frequency domain data of the received multicarrier symbols; obtaining (S101b) a channel estimation of a subcarrier carrying one of the pilot signals wherein the channel estimation is a frequency domain channel estimation calculated based on each of the received multicarrier symbols; and mixing (103, 203) the channel estimation of the subcarrier carrying one of the pilot signals with the cell pilot frequency data of the pilot signal, wherein the mixing comprises: a conjugate complex multiplication operation on the channel estimation of the subcarrier carrying one of the pilot signals and the cell pilot frequency data of the pilot signal; calculating (S103, 104, 204) the noise power by computing an absolute value of an imaginary part of a result from the conjugate complex multiplication; and calculating (S103, 104, 204) a signal power of the corresponding subcarrier by computing an absolute value of a real part of the result from the conjugate complex multiplication. receiving multicarrier symbols, the multicarrier symbols including pilot signals and the multicarrier symbols are OFDM symbols; obtaining (S101a) cell pilot frequency data of each of the pilot signals based on frequency domain data of the received multicarrier symbols; obtaining (S101b) a channel estimation of a subcarrier carrying one of the pilot signals wherein the channel estimation is a frequency domain channel estimation calculated based on each of the received multicarrier symbols; and mixing (103, 203) the channel estimation of the subcarrier carrying one of the pilot signals with the cell pilot frequency data of the pilot signal, wherein the mixing comprises: a conjugate complex multiplication operation on the channel estimation of the subcarrier carrying one of the pilot signals and the cell pilot frequency data of the pilot signal; calculating (S103, 104, 204) the noise power by computing an absolute value of an imaginary part of a result from the conjugate complex multiplication; and calculating (S103, 104, 204) a signal power of the corresponding subcarrier by computing an absolute value of a real part of the result from the conjugate complex multiplication. a conjugate complex multiplication operation on the channel estimation of the subcarrier carrying one of the pilot signals and the cell pilot frequency data of the pilot signal; calculating (S103, 104, 204) the noise power by computing an absolute value of an imaginary part of a result from the conjugate complex multiplication; and calculating (S103, 104, 204) a signal power of the corresponding subcarrier by computing an absolute value of a real part of the result from the conjugate complex multiplication.