MIMO TRANSFER WITH PRECODING DEPENDING ON RANK Russian patent published in 2011 - IPC H04L25/03 

FIELD: information technologies.

SUBSTANCE: methods are described to do precoding of MIMO transfer depending on rank. Each rank may be connected to a set of at least one precoding vector or precoding matrix, which may ensure good parameters for this rank. A transmitter may get a precoding vector for transfer with a rank-1 from the first set comprising at least one vector-column of a unitary matrix, for instance, a Fourier matrix. The transmitter may do precoding for transfer with the rank-1 on the basis of the precoding vector. The transmitter may receiver a precoding matrix for transfer with a rank-2 from the second set comprising an identity matrix. The transmitter may do precoding for transfer with the rank-2 on the basis of the precoding matrix. For transfer with the rank-2 the transmitter may select the identity matrix as a precoding matrix, if a MIMO channel is similar to a diagonal channel (which may be determined on the basis of antenna configurations), and may select a unitary matrix by another method.

EFFECT: improved throughput capacity and reliability.

34 cl, 8 dwg