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

Linear pre-coding method in multi-user MIMO system

A linear precoding, multi-input technology, applied in the field of linear precoding, can solve the problems of increased linear precoding complexity, low linear precoding efficiency, large SVD decomposition calculation complexity, etc., to achieve the effect of eliminating co-channel interference

Inactive Publication Date: 2011-04-20
TD TECH COMM TECH LTD
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this process, when determining the linear precoding matrix in steps 1 and 2, it is necessary to perform SVD decomposition on the interference channel transmission matrix , and The computational complexity of SVD decomposition itself is large, so the linear precoding complexity of the signal at the sending end increases, and the linear precoding efficiency is low
In addition, when SVD decomposition is used for linear precoding, further sorting processing of SVD decomposition cannot be used to further improve system performance

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
  • Linear pre-coding method in multi-user MIMO system
  • Linear pre-coding method in multi-user MIMO system
  • Linear pre-coding method in multi-user MIMO system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] FIG. 2 is a specific flow chart of the linear precoding method in Embodiment 1 of the present invention. As shown in Figure 2, the method includes:

[0057] Firstly, the linear precoding matrix of each user is determined. During this process, the method of determining the linear precoding matrix is ​​the same for different users. The determination process of the linear precoding matrix of user k is described below as an example.

[0058] Step 201, the base station determines the interference channel transmission matrix of user k according to the channel estimation result In this step, according to channel estimation, the downlink channel transmission matrix H from the base station to each user is obtained k , k=1, 2,..., K, and determine the user's interference channel transmission matrix for H ¯ k = [ H 1 H , . . ...

Embodiment 2

[0075] FIG. 3 is a specific flow chart of the linear precoding method in Embodiment 2 of the present invention. As shown in Figure 3, the method includes:

[0076] Firstly, the linear precoding matrix of each user is determined. During this process, the method of determining the linear precoding matrix is ​​the same for different users. The determination process of the linear precoding matrix of user k is described below by taking the determination of the linear precoding matrix of user k as an example.

[0077] Steps 301-302, the base station determines the interference channel transmission matrix of user k according to the channel estimation result Interfering channel transmission matrix for user k The conjugate transpose matrix of Perform QR decomposition.

[0078] The operations in the above steps 301-302 are the same as the operations in steps 201-202 in the first embodiment, and will not be repeated here.

[0079] In this embodiment, it is assumed that the linear ...

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

The invention discloses a linear precoding method in a multiuser multi-input and multi-output (MIMO) system, which comprises the following steps: determining the interference channel transmission matrix HK in the system of each user according to the channel estimation results, wherein, k is user index, k is in the range from 1 to K, and K is the user number served by the system base station simultaneously in the same band range; carrying out the QR decomposition to the conjugate transposed matrix HK<H> of a random user's interference channel transmission matrix HK, and forming the user's linear precoding matrix Tk according to the QR decomposition result; and carrying out the linear precoding to each user's emission signal sk respectively by utilizing the formed linear precoding matrix Tk.

Description

technical field [0001] The invention relates to the linear precoding technology in the communication technology, in particular to a linear precoding method in a multi-user multiple-input multiple-output (MIMO) system. Background technique [0002] In a multi-user MIMO Orthogonal Frequency Division Multiplexing (OFDM) system, multi-user spatial multiplexing is an important technology to improve wireless spectrum utilization. In a multi-user MIMO system, if the base station uses the same frequency band and the same time slot to communicate with multiple users, and at the same time, there is no channel state information (CSI) that reflects the channel characteristics in the base station, then the shared channel generated between multiple users Interference would be irreversible, and channel sharing among multiple users would be next to impossible. [0003] However, in fact, CSI reflecting channel characteristics can be obtained in various ways, for example, obtaining a channel...

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): H04L1/02H04B7/02
Inventor 王大飞拉盖施薛强
Owner TD TECH COMM TECH LTD