An apparatus for a 5G communication system, comprising: means for receiving transmission on two different polarizations over a wireless channel from a device ; means for determining a plurality of coefficients associated with a precoding matrix based on channel measurements of the reception, wherein the coefficients at least partially define a combination matrix; means for selecting a coefficient among the coefficients of the weaker polarization, the selected coefficient being a reference coefficient for the weaker polarization; means for determining a first indicator and a second indicator for the reference coefficient, wherein the first indicator indicates a position of the reference coefficient in the combination matrix and the second indicator indicates an amplitude of the reference coefficient with respect to the amplitude of the coefficient with the largest magnitude; means for reporting a bitmap corresponding to the combination matrix to the device , the bitmap indicating spatial and frequency domain locations of those coefficients that exceed a predetermined threshold; means for reporting the first and second indicators to the device , wherein reporting the first indicator comprises reporting the first indicator to the device in a sequence comprising amplitude values of the coefficients exceeding the predetermined threshold except the coefficient with the largest magnitude, wherein the first indicator comprises a predetermined value in the sequence, and wherein the order of the sequence is determined by the bitmap, and the position of the first indicator in the sequence determines the position of the reference coefficient in the combination matrix. means for receiving transmission on two different polarizations over a wireless channel from a device ; means for determining a plurality of coefficients associated with a precoding matrix based on channel measurements of the reception, wherein the coefficients at least partially define a combination matrix; means for selecting a coefficient among the coefficients of the weaker polarization, the selected coefficient being a reference coefficient for the weaker polarization; means for determining a first indicator and a second indicator for the reference coefficient, wherein the first indicator indicates a position of the reference coefficient in the combination matrix and the second indicator indicates an amplitude of the reference coefficient with respect to the amplitude of the coefficient with the largest magnitude; means for reporting a bitmap corresponding to the combination matrix to the device , the bitmap indicating spatial and frequency domain locations of those coefficients that exceed a predetermined threshold; means for reporting the first and second indicators to the device , wherein reporting the first indicator comprises reporting the first indicator to the device in a sequence comprising amplitude values of the coefficients exceeding the predetermined threshold except the coefficient with the largest magnitude, wherein the first indicator comprises a predetermined value in the sequence, and wherein the order of the sequence is determined by the bitmap, and the position of the first indicator in the sequence determines the position of the reference coefficient in the combination matrix. <EOS>