MIMO-based downlink data transmission method, device and system

A technology of downlink data and transmission method, which is applied in the field of communication, and can solve problems such as inability to select, unsatisfactory realization of precoding matrix, quantization error, etc.

Active Publication Date: 2011-04-27
DATANG MOBILE COMM EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are quantization errors in PMI-based precoding technology, which will lead to the loss of precoding gain; at the same time, the estimation of precoding matrix and CQI by the user terminal side has great restrictions on the base station side, because the base station cannot base on the actual network en

Method used

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  • MIMO-based downlink data transmission method, device and system
  • MIMO-based downlink data transmission method, device and system
  • MIMO-based downlink data transmission method, device and system

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Embodiment Construction

[0037] In a communication system based on multiple-input multiple-output (MIMO) technology, in order to improve the precoding gain, in the embodiment of the present invention, a downlink data transmission method based on channel reciprocity is proposed, which specifically includes: receiving the uplink signal, and perform uplink channel estimation based on the uplink signal to obtain corresponding uplink channel state information, and then convert the uplink channel state information into corresponding downlink channel state information; according to the obtained downlink channel state information, calculate For the precoding matrix of the user terminal, perform precoding on the downlink transmission data according to the obtained precoding matrix, and send the precoded downlink transmission data to the user terminal.

[0038] or,

[0039] receiving the uplink signal sent by the user terminal and the fed back Precoding Matrix Indicator (Precoding MatrixIndicator, PMI), and per...

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Abstract

The invention discloses a multiple input multiple output (MIMO)-based downlink data transmission method, device and system. The method comprises the following steps of: receiving an uplink signal transmitted by a user terminal, executing uplink channel estimation based on the uplink signal to acquire corresponding uplink channel state information and converting the uplink channel state information into corresponding downlink channel state information; and calculating a pre-coding matrix aiming at the user terminal according to the acquired downlink channel state information, pre-coding downlink transmission data according to the acquired pre-coding matrix and transmitting the pre-coded downlink transmission data to the user terminal. Thus, the accuracy for acquiring the pre-coding matrix can be improved, the acquired downlink channel state information can be matched with the adopted pre-coding matrix, and optimal pre-coding is realized, so that the pre-coding gain is improved, and the system capacity is greatly improved.

Description

technical field [0001] The present invention relates to the communication field, in particular to a MIMO-based downlink data transmission method, device and system. Background technique [0002] In a Long Term Evolution (LTE) system, the network side usually uses Multiple Input Multiple Output (MIMO) technology to transmit and receive signals through multiple antennas at the transmitter and receiver, thereby greatly improving System transmission performance and capacity. Among them, MIMO-based transmit diversity technology is to repeatedly send precoded data streams at the transmitter to obtain diversity gain and coding gain; while MIMO-based spatial multiplexing technology is to simultaneously transmit multiple different data streams at the transmitter , so that the capacity and spectrum efficiency of the communication system can be doubled without increasing the bandwidth, which truly embodies the essence of the capacity improvement of the MIMO system. However, the use of...

Claims

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Application Information

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IPC IPC(8): H04L1/00H04B7/02
Inventor 陈文洪缪德山肖国军孙韶辉
Owner DATANG MOBILE COMM EQUIP CO LTD
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