Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method and apparatus for channel information feedback and precoding

A channel information and precoding technology, which is applied in the field of channel information feedback and precoding, can solve problems such as system performance deterioration, achieve BlockErrorRate reduction, good backward compatibility, and achieve simple effects

Active Publication Date: 2014-11-05
ALCATEL LUCENT SHANGHAI BELL CO LTD
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this type of implicit feedback technology solution is only applicable to the first-order situation, and the system performance deteriorates sharply for the multi-order situation

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
  • Method and apparatus for channel information feedback and precoding
  • Method and apparatus for channel information feedback and precoding
  • Method and apparatus for channel information feedback and precoding

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0037] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0038] figure 1 It shows an application scenario diagram of a wireless communication network according to a specific embodiment of the present invention, where the base station 21 has N t Transmit antennas, N t Greater than 1; user terminal 11 has N r Transmit antennas, N r Greater than or equal to 1. The uplink and downlink channels between the user terminal 11 and the base station 21 are asymmetric channels. The base station 21 needs to precode the data to be sent to the user terminal 11 based on the downlink channel information fed back by the user terminal 11 and send it to the user terminal 11.

[0039] figure 2 It shows a flowchart of a method for feeding back downlink channel information to a base station in a user terminal of a wireless communication network according to a specific embodiment of the present invention. The following combi...

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 proposes a technical scheme (called as explicit feedback) used for feeding the information of downlink channels back to the base station in the user terminals of wireless communication system, and a technical scheme for precoding the data transmitted to the user terminals according to the information of downlink channels fed back by the user terminals in the base station. The user terminal determines an approximately equivalent matrix of the transmission matrix of downlink channel, according to the transmission matrix of downlink channel, the number of downlink data streams, the space correlation matrixes of multiple transmitting antennas in the base station and a predetermined codebook; then feeds the related information of the approximately equivalent matrix back to the base station. The base station recovers the approximately equivalent matrix according to the related information of the approximately equivalent matrix fed back from the user terminal, and precodes the downlink data transmitted to the user terminal by using the approximately equivalent matrix.

Description

Technical field [0001] The present invention relates to a method and device for channel information feedback and precoding. Background technique [0002] In the LTE-Advanced wireless communication system, for the FDD MIMO system, in order to obtain higher downlink spectrum efficiency, the user terminal feeds back the precoding codeword to the base station for the base station to precode the signal to be sent to the user terminal. The method is called implicit feedback, that is, the user terminal determines the precoding codeword according to the downlink channel transmission matrix, and feeds the codeword back to the base station. At present, Intel, Huawei and other companies have proposed the use of the precoding codebook defined in the existing specifications to perform first-order correlation adaptive implicit feedback technology. The meaning of "correlation adaptive" refers to the use of downlink channel spatial correlation matrix to transform In the predefined codebook, the...

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): H04L1/06
CPCH04L1/0026H04B7/0417H04L1/0028H04B7/0421H04B7/0639H04L1/06
Inventor 陈晋辉李栋
Owner ALCATEL LUCENT SHANGHAI BELL CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com