Multi-input multi-output system, data transmission method and data transmission device thereof

Abstract

The invention discloses a multi-input multi-output system, a data transmission method and a data transmission device thereof, which are used for improving the throughput of uplink data transmission inthe multi-input multi-output system. The method comprises that: a user terminal side performs corresponding modulation and coding on a data stream to be transmitted according to received modulation and coding scheme MCS information determined by a base station side, and inserts a user dedicated demodulation reference signal into each data stream to be transmitted respectively; downlink channel estimation is performed, and according to downlink channel information obtained by the estimation, eigenvalue decomposition is performed to obtain a corresponding pre-coding matrix which is used as an uplink pre-coding matrix; and the uplink pre-coding matrix is adopted to pre-code the data stream inserted with the user dedicated demodulation reference signal, and then the pre-coded data stream is transmitted to the base station side. The method and the device fully utilize uplink channel state information to obtain the spatial diversity gain of a plurality of antennae and improve the throughputof the uplink data transmission.

Description

technical field [0001] The present invention relates to the technical field of communication, in particular to a multiple input multiple output (Multiple Input Multiple Output, MIMO) system and a data transmission method and device thereof. Background technique [0002] MIMO technology uses multiple antennas for transmission and reception at both the transmitting end and the receiving end, thereby greatly improving the transmission performance and capacity of the system. The transmission diversity technology of MIMO is to repeatedly send the precoded data stream at the transmitter to obtain diversity gain and coding gain; the spatial multiplexing technology of the MIMO system is to send several different data streams at the transmitter, so as not to increase In the case of increasing the bandwidth, the capacity and spectrum efficiency of the communication system can be doubled, which truly embodies the essence of the capacity improvement of the MIMO system, but it requires t...

AI Technical Summary

Problems solved by technology

[0006] For the open-loop SU-MIMO mode, the throughput of the system is low because the channel information is not fully utilized to match the channel; for the SU-MIMO mode in the closed-loop codebook form, Due to the use of codebook quantization, the throughput of the system will also be affected

At the same time, the latter notifies the UE of the PMI and increases the signaling overhead

Images