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CSI (Channel State Information) feedback method and CSI feedback device

An arrangement and precoding matrix technology, applied in the field of communication, can solve problems such as affecting the data transmission rate, reducing the throughput of the data stream transmission, and mismatching the SINR of the data stream detection.

Active Publication Date: 2017-07-07
DATANG MOBILE COMM EQUIP CO LTD
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Problems solved by technology

[0005] If multiple data streams mapped to the same codeword have large SINR differences due to different precoding gains, they use the same modulation and coding method, which may cause the modulation and coding method of some data streams to be too high or too low, which is not related to the detection of data streams. The SINR does not match, resulting in a decrease in the transmission throughput of these data streams, affecting the overall data transmission rate

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  • CSI (Channel State Information) feedback method and CSI feedback device
  • CSI (Channel State Information) feedback method and CSI feedback device
  • CSI (Channel State Information) feedback method and CSI feedback device

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Embodiment Construction

[0075] The LTE network uses MIMO technology to increase system capacity and improve throughput. figure 1 A structure block diagram of a MIMO system taking a single user as an example is shown, and the transmitting end, such as a base station, and the receiving end, such as a terminal, both have multiple antennas. At the transmitting end, the input serial code stream is converted into several parallel independent sub-code streams through a series of preprocessing (modulation, coding, weighting, mapping), and sent out through different transmitting antennas. At the receiving end, the number of antenna groups not less than the number of transmitting antennas is used to receive, and the estimated channel transmission characteristics and a certain coding relationship between the transmitted sub-streams are used to process the multi-channel received signals in the space and time domains, so that Separate several channels of sending sub-streams, and then convert them into serial data...

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Abstract

The invention discloses a CSI (Channel State Information) feedback method and a CSI feedback device. A terminal extends an initial precoding matrix set according to an agreed column vector arrangement mode to obtain an extended precoding matrix set, and CSI measurement and feedback are carried out according to the extended precoding matrix set. As the extended precoding matrix set is obtained on the basis of extending the initial precoding matrix set, the scale of the extended precoding matrix set is larger than that of the initial precoding matrix set, when CSI measurement and feedback based on the extended precoding matrix set and CSI measurement and feedback based on the initial precoding matrix set are compared, the CSI determined and fed back by the terminal can more reflect the actual channel state, and the possibility of excessively large SINR (Signal to Interference plus Noise Ratio) difference of multiple data streams mapped to the same codeword can be further reduced.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a CSI (Channel State Information, channel state information) feedback method and device. Background technique [0002] Mobile and broadband have become the development direction of modern communication technology. 3GPP (3rd Generation Partnership Project) is committed to the evolution of LTE (Long Term Evolution, long-term evolution) system as a 3G system, with the goal of developing 3GPP wireless access technology Evolution towards high data rates, low latency and optimized packet data applications. The multi-antenna technology of the physical layer has become one of the key technologies of the current mobile communication system. The multi-antenna technology has many advantages, such as utilizing the multiplexing gain of multiple antennas to expand the throughput of the system and so on. [0003] The LTE Rel-8 system introduces closed-loop precoding technology t...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/06H04B7/0456
CPCH04B7/0456H04B7/0626H04B7/0632H04L1/06
Inventor 陈文洪陈润华高秋彬
Owner DATANG MOBILE COMM EQUIP CO LTD