Precoding technique

A method of precoding a signal to be transmitted over a physical channel from a sender to a receiver, the method comprising:

• providing precoding information via a feedback mechanism to the sender, wherein a precoding matrix (W) is computed at the receiver and configured for a detection based on an estimation error and enhancing mutual information (I) at the receiver, wherein a covariance (E) of the estimation error is related to a gradient of the mutual information with respect to the precoding matrix by a relation, the relation being employed for computing the precoding matrix,
• wherein the precoding information comprises the precoding matrix;
• receiving, from the sender and over the physical channel, a signal precoded by the precoding matrix based on the precoding information.

A computer program product stored in a non-transitory computer readable medium for precoding a signal to be transmitted over a physical channel from a sender to a receiver, the computer program product comprising software instructions which, when run on one or more computing devices, causes the one or more computing devices to:

• receive precoding information by a feedback mechanism from the receiver;
• apply a precoding matrix at the sender based on the precoding information to generate a precoded signal for transmission over the physical channel, the precoding matrix configured for a detection based on an estimation error and enhancing mutual information at the receiver, wherein a covariance of the estimation error is related to a gradient of the mutual information with respect to the precoding matrix by a relation,
• wherein the relation is employed for computing the precoding matrix.

A device for precoding a signal to be transmitted over a physical channel from a sender to a receiver, the device comprising:

• a receiver unit configured to receive precoding information by a feedback mechanism from the receiver;
• an application unit configured to apply a precoding matrix at the sender based on the precoding information resulting in a precoded signal for transmission over the physical channel, the precoding matrix being configured for a detection based on an estimation error and enhancing mutual information at the receiver, wherein a covariance of the estimation error is related to a gradient of the mutual information with respect to the precoding matrix, wherein the relation is employed for computing the precoding matrix.

A device for precoding a signal to be transmitted over a physical channel from a sender to a receiver, the device comprising:

• a feedback unit configured to provide precoding information via a feedback mechanism to the sender, wherein a precoding matrix is computed at the receiver and configured for a detection based on an estimation error and enhancing mutual information at the receiver, wherein a covariance of the estimation error is related to a gradient of the mutual information with respect to the precoding matrix by a relation, wherein the relation is employed for computing the precoding matrix, wherein the precoding information comprises the precoding matrix;
• a receiver unit configured to receive, from the sender and over the physical channel, a signal precoded by the precoding matrix based on the precoding information.