A communication device for providing a channel state information, CSI, feedback in a wireless communication system, the communication device comprising: a transceiver configured to receive, from a transmitter a radio signal via a MIMO channel, the radio signal including downlink reference signals according to a reference signal configuration comprising a number of antenna ports, and downlink signals comprising the reference signal configuration; and a processor configured to - estimate an explicit CSI using measurements on the downlink reference signals on the radio channel, the downlink reference signals provided over a certain observation time, characterized in that the processor is configured to - select, based on a performance metric, a Doppler-delay precoder matrix for a composite Doppler-delay-beam three-stage precoder, the Doppler-delay-beam three-stage precoder being based on one or more codebooks, the one or more codebooks including ∘ one or more transmit-side spatial beam components of the composite Doppler-delay-beam three-stage precoder, ∘ one or more delay components of the composite Doppler-delay-beam three-stage precoder, and ∘ one or more Doppler-frequency components of the composite Doppler-delay-beam three-stage precoder, - determine a precoder matrix indicator, PMI, using the composite Doppler-delay-beam three-stage precoder with the selected Doppler-delay-beam precoder matrix, and - report to the transmitter the CSI feedback including the PMI, wherein the PMI is used to indicate the Doppler-delay-beam three-stage composite precoder matrix for the configured antenna ports. a transceiver configured to receive, from a transmitter a radio signal via a MIMO channel, the radio signal including downlink reference signals according to a reference signal configuration comprising a number of antenna ports, and downlink signals comprising the reference signal configuration; and a processor configured to - estimate an explicit CSI using measurements on the downlink reference signals on the radio channel, the downlink reference signals provided over a certain observation time, - estimate an explicit CSI using measurements on the downlink reference signals on the radio channel, the downlink reference signals provided over a certain observation time, characterized in that the processor is configured to - select, based on a performance metric, a Doppler-delay precoder matrix for a composite Doppler-delay-beam three-stage precoder, the Doppler-delay-beam three-stage precoder being based on one or more codebooks, the one or more codebooks including ∘ one or more transmit-side spatial beam components of the composite Doppler-delay-beam three-stage precoder, ∘ one or more delay components of the composite Doppler-delay-beam three-stage precoder, and ∘ one or more Doppler-frequency components of the composite Doppler-delay-beam three-stage precoder, - determine a precoder matrix indicator, PMI, using the composite Doppler-delay-beam three-stage precoder with the selected Doppler-delay-beam precoder matrix, and - report to the transmitter the CSI feedback including the PMI, wherein the PMI is used to indicate the Doppler-delay-beam three-stage composite precoder matrix for the configured antenna ports. - select, based on a performance metric, a Doppler-delay precoder matrix for a composite Doppler-delay-beam three-stage precoder, the Doppler-delay-beam three-stage precoder being based on one or more codebooks, the one or more codebooks including ∘ one or more transmit-side spatial beam components of the composite Doppler-delay-beam three-stage precoder, ∘ one or more delay components of the composite Doppler-delay-beam three-stage precoder, and ∘ one or more Doppler-frequency components of the composite Doppler-delay-beam three-stage precoder, ∘ one or more transmit-side spatial beam components of the composite Doppler-delay-beam three-stage precoder, ∘ one or more delay components of the composite Doppler-delay-beam three-stage precoder, and ∘ one or more Doppler-frequency components of the composite Doppler-delay-beam three-stage precoder, - determine a precoder matrix indicator, PMI, using the composite Doppler-delay-beam three-stage precoder with the selected Doppler-delay-beam precoder matrix, and - report to the transmitter the CSI feedback including the PMI, wherein the PMI is used to indicate the Doppler-delay-beam three-stage composite precoder matrix for the configured antenna ports.