Data transmission method and device

Abstract

The invention discloses a data transmission method and device, and belongs to the technical field of wireless communication. The data transmission method comprises the steps that an evolved node B (eNB) receives a rank index (RI) and a first precoding matrix index (PMI), which are sent by user equipment (UE), of a data channel, determines a precoding matrix set of data to be transmitted of the UE according to the RI and the PMI, wherein the precoding matrix set comprises a plurality of precoding matrixes; precoding matrixes are selected from the precoding matrix set according to a transmitting order of the data to be transmitted in the frequency domain and time domain, different precoding matrixes in the precoding matrix set are selected when the data to be transmitted is transmitted on the position of at least two resource elements (RE) existing in one resource block (RB) used for transmitting the data to be transmitted; and the data to be transmitted is subjected to weighting processing through the selected precoding matrixes and then transmitted to the UE. The data transmission device comprises a first receiving module, a first determination module, a first selection module and a first transmission module. The data transmission method and device can improve the precoding performance.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, in particular to a data transmission method and device. Background technique [0002] A Multiple Input Multiple Output (MIMO) wireless communication system can obtain diversity and array gain through precoding. Therefore, how to perform data transmission in the MIMO wireless communication system is the focus of the industry. [0003] At present, when the base station transmits data to the user terminal, the base station (Evaluated NodeB, eNB) sends the channel state information reference symbol (Channel State Information Reference Signal, CSI-RS) to the user terminal (Use Equipment, UE), and the UE according to the CSI- The RS obtains the first precoding matrix and the second precoding matrix of the current data channel. The first precoding matrix consists of multiple column vectors, and the second precoding matrix consists of column vectors selected from multiple column ve...

AI Technical Summary

Problems solved by technology

[0005] In the scene where the UE moves at high speed, the data channel changes rapidly. When the data channel changes, the phase difference in the second precoding matrix will change. However, the eNB calculates the precoding matrix according to the second precoding matrix and passes the precoding matrix. When the matrix performs weighting processing on the data to be transmitted, the phase difference has changed, resulting in a mismatch between the calculated precoding matrix and the current data channel, resulting in a decrease in precoding performance

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