A method for calibrating a plurality of receivers (102; 104; 106) in a multiple input multiple output, MIMO, communication system, the method comprising: operating the MIMO communication system in a calibration mode comprising: by respective ones of the plurality of receivers (102; 104; 106): receiving a single respective calibration sequence, wherein the received calibration sequence is a modified version of a common calibration sequence from a source, wherein the received calibration sequence is modified from propagating through a respective channel between the respective receiver and the source and wherein the common calibration sequence is a Constant Amplitude Zero Autocorrelation, CAZAC, sequence; deriving a respective equalizer comprising equalizer coefficients based on the received calibration sequence; and aligning a time and a phase associated with one or more receivers (102; 104; 106) of the plurality of receivers, and correcting a non-uniform frequency response of the one or more receivers (102; 104; 106); wherein the aligning of the time and the phase and the correcting the non-uniform frequency response is performed based on the derived equalizers by filtering signals received by the one or more receivers with equalizer coefficients of the respective equalizers of the one or more receivers, wherein equalizer coefficients of the respective equalizers are used to perform both the time and phase alignment and the correcting the non-uniform frequency response; and wherein the aligning of the time and the phase and the correcting the non-uniform frequency response at least partially corrects for differences in channels experienced by different ones of the plurality of receivers (102; 104; 106). operating the MIMO communication system in a calibration mode comprising: by respective ones of the plurality of receivers (102; 104; 106): receiving a single respective calibration sequence, wherein the received calibration sequence is a modified version of a common calibration sequence from a source, wherein the received calibration sequence is modified from propagating through a respective channel between the respective receiver and the source and wherein the common calibration sequence is a Constant Amplitude Zero Autocorrelation, CAZAC, sequence; deriving a respective equalizer comprising equalizer coefficients based on the received calibration sequence; and aligning a time and a phase associated with one or more receivers (102; 104; 106) of the plurality of receivers, and correcting a non-uniform frequency response of the one or more receivers (102; 104; 106); wherein the aligning of the time and the phase and the correcting the non-uniform frequency response is performed based on the derived equalizers by filtering signals received by the one or more receivers with equalizer coefficients of the respective equalizers of the one or more receivers, wherein equalizer coefficients of the respective equalizers are used to perform both the time and phase alignment and the correcting the non-uniform frequency response; and wherein the aligning of the time and the phase and the correcting the non-uniform frequency response at least partially corrects for differences in channels experienced by different ones of the plurality of receivers (102; 104; 106). receiving a single respective calibration sequence, wherein the received calibration sequence is a modified version of a common calibration sequence from a source, wherein the received calibration sequence is modified from propagating through a respective channel between the respective receiver and the source and wherein the common calibration sequence is a Constant Amplitude Zero Autocorrelation, CAZAC, sequence; deriving a respective equalizer comprising equalizer coefficients based on the received calibration sequence; and aligning a time and a phase associated with one or more receivers (102; 104; 106) of the plurality of receivers, and correcting a non-uniform frequency response of the one or more receivers (102; 104; 106); wherein the aligning of the time and the phase and the correcting the non-uniform frequency response is performed based on the derived equalizers by filtering signals received by the one or more receivers with equalizer coefficients of the respective equalizers of the one or more receivers, wherein equalizer coefficients of the respective equalizers are used to perform both the time and phase alignment and the correcting the non-uniform frequency response; and wherein the aligning of the time and the phase and the correcting the non-uniform frequency response at least partially corrects for differences in channels experienced by different ones of the plurality of receivers (102; 104; 106).