FIELD: information technology.
SUBSTANCE: transmitter sends a first reference signal via a first link, e.g., a cell- specific reference signal via the downlink, and receives channel quality indicator (CQI) information determined by a receiver based on the first reference signal. The transmitter also receives a second reference signal from the receiver via a second link, e.g., a probing reference signal via an uplink, and obtains at least one MIMO channel matrix for the first link based on the second reference signal; and determines at least one precoding matrix based on the at least one MIMO channel matrix, e.g., in accordance with ideal eigen-beam forming or pseudo eigen-beam forming, and then sends a data transmission to the receiver based on the at least one precoding matrix and the CQI information.
EFFECT: higher throughput.
30 cl, 10 dwg
