Method and device for feeding back channel state information in MIMO system
What is Al technical title?
Al technical title is built by PatSnap Al team. It summarizes the technical point description of the patent document.
A technology for feedback channel and state information, applied in the field of communication, can solve the problem of not reflecting the channel change and so on
Active Publication Date: 2016-11-23
ZTE CORP
View PDF5 Cites 36 Cited by
Summary
Abstract
Description
Claims
Application Information
AI Technical Summary
This helps you quickly interpret patents by identifying the three key elements:
Problems solved by technology
Method used
Benefits of technology
Problems solved by technology
But in the long-period feedback W 1 After selection, since W 1 The 4 DFT vectors in are far apart, when the channel ch...
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
Click on the blue label to locate the original text in one second.
Reading with bidirectional positioning of images and text.
Smart Image
Examples
Experimental program
Comparison scheme
Effect test
Embodiment 1
[0161] The number of antennas of the base station eNB is 8, and the number of receiving antennas of the terminal is 2. The base station sends a 16Tx channel state measurement pilot to the terminal UE, and the terminal performs channel measurement according to the received measurement pilot, and feeds back CSI information, including PMI information, to the base station.
[0162] The codebook of 8Tx is U 8 =W 1 ·W 2 ;
[0163] in: W 1 , n = X n 0 0 X n where n = 0,1 , . . , 15
[0164] X n ...
Embodiment 2
[0188] The number of antennas of the base station eNB is 8, and the number of receiving antennas of the terminal is 2. The base station sends a 16Tx channel state measurement pilot to the terminal UE, and the terminal performs channel measurement according to the received measurement pilot, and feeds back CSI information, including PMI information, to the base station.
[0189] The codebook of 8Tx is U 8 =W 1 ·W 2 ;
[0190] in: W 1 , n = X n 0 0 X n where , n = 0,1 , . . , 15
[0191] X ...
Embodiment 3
[0209] The number of antennas of the base station eNB is 16, and the number of receiving antennas of the terminal is 2. The base station sends a 16Tx channel state measurement pilot to the terminal UE, and the terminal performs channel measurement according to the received measurement pilot, and feeds back CSI information, including PMI information, to the base station.
[0210] The Rank1 / 2 codebook structure of 16Tx is:
[0211] U 1 = v 0 βv 1 U 2 = ...
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 provides a method and a device for feeding back channel state information in an MIMO (Multi-input Multi-output) system. The method comprises the step that terminal UE feeds back CSI (Channel State Information) to a base station eNodeB, wherein the CSI comprises codebook index information; the codebook index information comprises a first type of codebook index set I and a second type of codebook index set J; the combination of the first type of index set I and the second type of index set J is used for indicating a pre-coding matrix U; the pre-coding matrix U is an Nt*r matrix; in the matrix, Nt represents the total number of ports or the total number of antennas, and r represents the number of transmission layers; the pre-coding matrix U is at least composed of Q*r basic vectors with the dimensional degree of Nt/Q; Q is not less than 2, r is not less than 1 and both Q and R are positive integers; and column extraction of the basic vectors is carried out from a matrix B, the matrix B is composed of M columns of Nt/Q dimension vectors, and M is a positive integer.
Description
technical field [0001] The invention relates to the communication field, in particular to a method and device for feeding back channel state information in a multiple-input multiple-output system. Background technique [0002] In the wireless communication system, the transmitting end and the receiving end adopt the method of spatial multiplexing, and obtain a higher rate by using multiple antennas. Compared with the general spatial multiplexing method, an enhanced technology is that the receiving end feeds back channel information to the sending end, and the sending end uses some transmit precoding techniques according to the obtained channel information to greatly improve the transmission performance. For single-user MIMO, channel feature vector information can be directly used for precoding; for multi-user MIMO, more accurate channel information is required. [0003] In the long term evolution (Long Term Evolution, LTE) plan, the feedback of channel information mainly ut...
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
Application Date:The date an application was filed.
Publication Date:The date a patent or application was officially published.
First Publication Date:The earliest publication date of a patent with the same application number.
Issue Date:Publication date of the patent grant document.
PCT Entry Date:The Entry date of PCT National Phase.
Estimated Expiry Date:The statutory expiry date of a patent right according to the Patent Law, and it is the longest term of protection that the patent right can achieve without the termination of the patent right due to other reasons(Term extension factor has been taken into account ).
Invalid Date:Actual expiry date is based on effective date or publication date of legal transaction data of invalid patent.
Login to view more 
Login to view more