Patent ID: 8781027

Claim:
An apparatus for determining a target precoding matrix from a plurality of precoding matrix candidates, the precoding matrix candidates being adapted to be applied on a data stream, wherein the data stream is to be transmitted by a transmitter, and wherein the apparatus comprises: a covariance matrix value provider for providing one or more complex covariance matrix values, wherein the one or more complex covariance matrix values are complex numbers, wherein each one of the one or more complex covariance matrix values is an off-diagonal coefficient of a multiple input multiple output channel covariance matrix or a combination of two or more off-diagonal coefficients of the multiple input multiple output channel covariance matrix, a real part determiner being configured to determine a real part of at least one of the one or more complex covariance matrix values or to determine a real part of a combination of at least one of the one or more complex covariance matrix values and at least one component of the precoding matrix candidates to obtain one or more real covariance values, wherein the one or more real covariance values are real numbers, and a precoding matrix determiner for determining the target precoding matrix from the plurality of precoding matrix candidates, wherein the precoding matrix determiner is configured to determine the target precoding matrix based on at least one of the one or more real covariance values.