A method for calibrating data transmitted by coordinated Access Points, APs, coordinated APs comprising a first AP and a second AP, the first AP and the second AP each comprising a set of antennas, characterized by: the first AP calculating a first channel frequency-domain response at a time t2 according to a calibration sequence received from the second AP; the second AP calculating a second channel frequency-domain response at a time t1 according to a calibration sequence received from the first AP; a base station obtaining the first channel frequency-domain response and the second channel frequency-domain response between the first AP and the second AP, dividing the second channel frequency-domain response by the first channel frequency-domain response to obtain an approximation of channel response difference between the first AP and the second AP; and calibrating data transmitted by the first AP and the second AP in coordination according to the approximation of channel response difference; wherein self-calibration of their own set of antennas is performed by the first AP and by the second AP, if the second channel frequency-domain response is calculated by the second AP at the time t1 according to the calibration sequence transmitted by the first AP via an antenna Ant(j) of the set of antennas of the first AP and received by the second AP via an antenna Ant(i) of the set of antennas of the second AP, obtaining the first channel frequency-domain response calculated by the first AP at the time t2 according to the calibration sequence transmitted by the second AP via an antenna Ant(j') of the set of antennas of the second AP and received by the first AP via an antenna Ant(i') of the set of antennas of the first AP; wherein i ∈ [0, N -1], i' ∈ [0, N -1], j ∈ [0, N -1], j' ∈ [0, N -1], i=j' and j=i', and N is a number of antennas of the first AP and the second AP, and the time t1 is different from the time t2, wherein the approximation of channel response difference refers to C AP 1 divided by C AP2; C AP 1 ( t 1) represents a ratio of channel frequency-domain responses corresponding to uplink radio frequency channel and downlink radio frequency channel of the antenna Ant(j) of the first AP at the time t1; C AP2 represents a ratio of channel frequency-domain responses corresponding to uplink radio frequency channel and downlink radio frequency channel of the antenna Ant(i) of the second AP at the time t2. the first AP calculating a first channel frequency-domain response at a time t2 according to a calibration sequence received from the second AP; the second AP calculating a second channel frequency-domain response at a time t1 according to a calibration sequence received from the first AP; a base station obtaining the first channel frequency-domain response and the second channel frequency-domain response between the first AP and the second AP, dividing the second channel frequency-domain response by the first channel frequency-domain response to obtain an approximation of channel response difference between the first AP and the second AP; and calibrating data transmitted by the first AP and the second AP in coordination according to the approximation of channel response difference; wherein self-calibration of their own set of antennas is performed by the first AP and by the second AP, if the second channel frequency-domain response is calculated by the second AP at the time t1 according to the calibration sequence transmitted by the first AP via an antenna Ant(j) of the set of antennas of the first AP and received by the second AP via an antenna Ant(i) of the set of antennas of the second AP, obtaining the first channel frequency-domain response calculated by the first AP at the time t2 according to the calibration sequence transmitted by the second AP via an antenna Ant(j') of the set of antennas of the second AP and received by the first AP via an antenna Ant(i') of the set of antennas of the first AP; wherein i ∈ [0, N -1], i' ∈ [0, N -1], j ∈ [0, N -1], j' ∈ [0, N -1], i=j' and j=i', and N is a number of antennas of the first AP and the second AP, and the time t1 is different from the time t2, wherein the approximation of channel response difference refers to C AP 1 divided by C AP2; C AP 1 ( t 1) represents a ratio of channel frequency-domain responses corresponding to uplink radio frequency channel and downlink radio frequency channel of the antenna Ant(j) of the first AP at the time t1; C AP2 represents a ratio of channel frequency-domain responses corresponding to uplink radio frequency channel and downlink radio frequency channel of the antenna Ant(i) of the second AP at the time t2.