Retransmission method and equipment in multi-input multi-output system

Abstract

The invention discloses a retransmission method and retransmission equipment in a multi-input multi-output system. The method adopts a main scheme comprising the following steps: respectively adding an equivalent channel correlation matrix adopted during an executed operation of transmitting given data and a plurality of currently-determined equivalent channel correlation matrixes to obtain a plurality of retransmission equivalent channel correlation matrixes; selecting a retransmission equivalent channel correlation matrix from the plurality of obtained retransmission equivalent channel correlation matrixes meeting a set condition; and utilizing a space-time encoding matrix corresponding to the selected retransmission equivalent channel correlation matrix to execute a space-time encodingoperation on the given data and then transmitting the encoded data. Under the condition of a certain signal to noise ratio, the method and the equipment reduce the bit error rate of retransmission, improve the retransmission performance and increase the success ratio of the retransmission.

Description

technical field [0001] The present invention relates to data transmission technology in the communication field, and in particular to a retransmission method and device in a multiple input multiple output (Multi Input Multi Output, MIMO) system. Background technique [0002] MIMO technology is an important technology in modern communication technology. Through MIMO technology, multiple antennas can be installed at the transmitting end and receiving end of the communication system, and the capacity and reliability of the system can be improved by using independent multipath fading between antennas. [0003] The traditional retransmission method in the MIMO system is implemented by using Hybrid Automatic Repeat reQuest (HARQ), which is an important Quality of Service (QoS) measure in the 3GPP standard. It is a key technology of the long term evolution standard (Long term evaluation, LTE). HARQ refers to the use of forward error correction (Forward Error Correction, FEC) and a...

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Problems solved by technology

[0004] The traditional HRAQ technology implemented in the MIMO system does not take into account the influence of the current channel state on retransmission, and uses a fixed space-time coding matrix for transmission in each retransmission, making it difficult to achieve a relatively high frequency for each retransmission. Good transmission performance; moreover, the receiving end must have the ability to decode the data processed by a variety of space-time coding matrices, which increases the complexity of the receiving end

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