A user equipment for wireless communications with a multiple-input multiple-output, MIMO, base station over a wireless communications channel, wherein the user equipment comprises: a communications interface configured to receive a current pilot signal over the wireless communications channel from the base station; and a processor configured to determine a current channel state information, CSI, on the basis of the current pilot signal and to determine a CSI reliability measure value on the basis of the current CSI and one or several previous CSIs, wherein the processor is configured to determine the previous CSIs on the basis of previous pilot signals; and wherein the communications interface is further configured to transmit (405, 705) the CSI reliability measure value and a CSI delay Δ CSI, to which the reliability measure corresponds, to the base station for allowing the base station to determine (413, 711) a precoding-diversity weighting factor on the basis of the CSI reliability measure value and the CSI delay and to further derive a plurality of weights θ b, b = 1,..., B, on the basis of the precoding-diversity weighting factor; or wherein the processor is further configured to determine a precoding-diversity weighting factor on the basis of the CSI reliability measure value and wherein the communications interface is configured to transmit the precoding-diversity weighting factor to the base station, wherein the precoding-diversity weighting factor allows the base station to derive a plurality of weights θ b, b = 1,..., B, wherein the weights θ b, b = 1,..., B, allow the base station to adaptively adjust a MIMO transmission scheme for data to be transmitted to the user equipment using a plurality of resource elements/blocks {1,..., B} by weighting a beamforming precoding component and a diversity precoding component of the MIMO transmission scheme; wherein the adaptively adjustable MIMO transmission scheme is a precoded space time/frequency block coding scheme associated with a space time/frequency block coding matrix; wherein, for b = 1,..., B, the weight θ b allows the base station to adaptively adjust the MIMO transmission scheme by weighting the columns or rows of the space time/frequency block coding matrix used for data transmission on the b-th resource element/block; wherein the user equipment is further configured to receive the weights θ b, b = 1,..., B, or an index of a pattern of the weights θ b, b = 1,..., B, from the base station; wherein the user equipment is further configured to perform joint effective channel estimation using the weights θ b, b = 1,..., B, or the index of the pattern of the weights θ b, b = 1,..., B, and wherein the user equipment is further configured to receive the data from the base station using the joint effective channel estimate. a communications interface configured to receive a current pilot signal over the wireless communications channel from the base station; and a processor configured to determine a current channel state information, CSI, on the basis of the current pilot signal and to determine a CSI reliability measure value on the basis of the current CSI and one or several previous CSIs, wherein the processor is configured to determine the previous CSIs on the basis of previous pilot signals; and wherein the communications interface is further configured to transmit (405, 705) the CSI reliability measure value and a CSI delay Δ CSI, to which the reliability measure corresponds, to the base station for allowing the base station to determine (413, 711) a precoding-diversity weighting factor on the basis of the CSI reliability measure value and the CSI delay and to further derive a plurality of weights θ b, b = 1,..., B, on the basis of the precoding-diversity weighting factor; or wherein the processor is further configured to determine a precoding-diversity weighting factor on the basis of the CSI reliability measure value and wherein the communications interface is configured to transmit the precoding-diversity weighting factor to the base station, wherein the precoding-diversity weighting factor allows the base station to derive a plurality of weights θ b, b = 1,..., B, wherein the weights θ b, b = 1,..., B, allow the base station to adaptively adjust a MIMO transmission scheme for data to be transmitted to the user equipment using a plurality of resource elements/blocks {1,..., B} by weighting a beamforming precoding component and a diversity precoding component of the MIMO transmission scheme; wherein the adaptively adjustable MIMO transmission scheme is a precoded space time/frequency block coding scheme associated with a space time/frequency block coding matrix; wherein, for b = 1,..., B, the weight θ b allows the base station to adaptively adjust the MIMO transmission scheme by weighting the columns or rows of the space time/frequency block coding matrix used for data transmission on the b-th resource element/block; wherein the user equipment is further configured to receive the weights θ b, b = 1,..., B, or an index of a pattern of the weights θ b, b = 1,..., B, from the base station; wherein the user equipment is further configured to perform joint effective channel estimation using the weights θ b, b = 1,..., B, or the index of the pattern of the weights θ b, b = 1,..., B, and wherein the user equipment is further configured to receive the data from the base station using the joint effective channel estimate.