Unlock instant, AI-driven research and patent intelligence for your innovation.

A csi feedback method and device

An arrangement method and precoding matrix technology, applied in the field of communication, can solve problems affecting data transmission rate, high modulation and coding methods, and decreased throughput of data stream transmission

Active Publication Date: 2020-07-21
DATANG MOBILE COMM EQUIP CO LTD
View PDF9 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A csi feedback method and device
  • A csi feedback method and device
  • A csi feedback method and device

Examples

Experimental program
Comparison scheme
Effect test

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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

Provided in the embodiments of the present invention are a method and a device for CSI feedback. In the present invention, a terminal expands, according to an agreed-upon column vector arrangement mode, an initial precoding matrix set so as to obtain an expanded precoding matrix set; and performs, according to the expanded precoding matrix set, CSI measurement and feedback. Since the expanded precoding matrix set is obtained on the basis of expanding the initial precoding matrix set, the scale of the expanded precoding matrix set is greater than that of the initial precoding matrix set. Therefore, the CSI measurement and feedback performed on the basis of the expanded precoding matrix set are able to, relative to the CSI measurement and feedback performed on the basis of the initial precoding matrix set, enable the CSI that is determined and fed back by the terminal to better reflect an actual channel state, thereby lowering the chances of the difference between SINRs of multiple data streams mapped to the same codeword being too large.

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. The goal is to develop 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 to imp...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(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