FIELD: radio engineering, communication.
SUBSTANCE: invention relates to wireless communication using a multiple input multiple output (MIMO) communication system and enables, in a transmission rate adaptive transmission scheme for MIMO systems, which can transmit a variable number of data symbol streams, to provide transmission diversity for each data symbol stream and fully utilise overall transmit power of the system and full power of each antenna. According to the invention, at least one data symbol stream is received for transmission from a plurality of antennae. Each data symbol stream is scaled with a respective weight coefficient corresponding to the value of transmit power allocated to that stream. The scaled data symbol stream(s) are multiplied with a transmit basis matrix to provide a plurality of transmitted symbol streams for the plurality of antennae. The transmit basis matrix (e.g., a Walsh-Hadamard matrix or a DFT matrix) is defined such that each data symbol stream is transmitted from all antennae and each transmitted symbol stream is transmitted at full (or close to full) power for the associated antenna.
EFFECT: improved communication.
19 cl, 4 dwg
