Method and device for feeding back channel state information and method and device for receiving channel state information
A technology of channel state information and receiving method, applied in the field of receiving methods and devices, can solve the problems of inaccurate RI and adverse effects on transmission efficiency, and achieve the effect of improving transmission efficiency
Active Publication Date: 2015-04-29
DATANG MOBILE COMM EQUIP CO LTD
View PDF3 Cites 29 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0015] Aiming at the problem that the overall RI calculated in the related art is not accurate enough, which leads to the problem that the transmission efficiency is adversely affected, the present invention proposes a feedback method and device for channel state information, as well as a receiving method and device, which can avoid the vertical channel state information The product of the RI in and the RI in the horizontal channel state information is directly determined as the overall RI, which helps to reasonably determine the overall CQI, thereby improving transmission efficiency
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 moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0049] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments of the present invention belong to the protection scope of the present invention.
[0050] According to a first embodiment of the present invention, a channel state information feedback method is provided.
[0051] Such as Figure 5 As shown, the channel state information feedback method according to the embodiment of the present invention includes:
[0052] Step S501, receiving a downlink pilot signal and performing channel estimation to obtain a channel estimation value;
[0053] Wherein, the downlink pilot signal may be a CSI-RS, and the terminal receives the CSI-RS, pe...
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
Login to View More Abstract
The invention discloses a method and device for feeding back channel state information and a method and device for receiving the channel state information. The feedback method comprises the following steps: receiving a downlink pilot signal and performing channel estimation to obtain a channel estimation value; determining RI (Rank Indication), a first pre-coding matrix, a second pre-coding matrix and a third pre-coding matrix based on the channel estimation value, and determining CQI (Channel Quality Indication) based on the determined RI, first pre-coding matrix, second pre-coding matrix and third pre-coding matrix; feeding back the RI, the CQI and the indexes of the first pre-coding matrix, the second pre-coding matrix and the third pre-coding matrix. According to the method and the device, product of the RI in the vertical channel state information and the RI in the horizontal channel state information can be prevented from being directly determined as integral RI; the RI and the third pre-coding matrix are determined during channel estimation and the CQI is determined according to the RI and the first to third pre-coding matrixes, so that the integral RI can be reasonably determined and the transmission efficiency can be improved.
Description
technical field [0001] The present invention relates to the field of wireless communication engineering, and in particular, relates to a feedback method and device for channel state information, and a receiving method and device. Background technique [0002] The Long Term Evolution (LTE for short) Rel-8 system introduces a closed-loop precoding technology to improve spectrum efficiency. Closed-loop precoding first requires both the base station and the terminal to store the same set of precoding matrices, which is called a codebook. [0003] In order to obtain channel information, the terminal in the LTE Rel-8 system receives the common pilot of the cell and performs channel estimation. In the LTE-A Rel-10 system, the terminal receives the CSI-RS and performs channel estimation. After estimating the channel information, a precoding matrix is selected from the codebook according to certain criteria. The selected criteria can be maximizing the amount of mutual informatio...
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
Login to View More IPC IPC(8): H04L1/06H04L1/16H04L1/00
Inventor 张然然高秋彬拉盖施
Owner DATANG MOBILE COMM EQUIP CO LTD