ADAPTIVE ANTENNA ARRAY WITH VARIABLE COHERENCE Russian patent published in 2021 - IPC H04B7/456 H01Q21/24 

FIELD: communication technology.

SUBSTANCE: invention relates to technologies for transmitting and receiving by means of a multi-element antenna, in particular, to codebooks and coding for spatial multiplexing. User equipment (UE) is proposed that transmits data to a base station and contains a plurality of antenna ports. The UE selects a precoding matrix from the corresponding first to fourth set of precoding matrices depending on the number of spatial layers, where the first to fourth sets of precoding matrices are available for all coherence capabilities and are contained in a larger set of precoding matrices. The larger set contains precoding matrices that are not available for all coherence capabilities. The first to fourth sets of precoding matrices correspond to one to four spatial layers, respectively. The number of columns in the selected precoding matrix is ​​equal to the number of spatial layers, and each column contains one non-zero element and one or more zero elements. The UE transmits data on the number of spatial layers in accordance with the selected precoding matrix.

EFFECT: support for transmit precoder matrix indicator (TPMI).

38 cl, 30 dwg, 26 tbl