Method, terminal, base station and communication system for transmitting channel characteristic information

A technology for channel characteristics and information transmission, applied in baseband system components, transmission systems, multi-frequency code systems, etc., can solve the problems of occupying a large feedback signaling overhead, inaccurate codebook precoding, and increasing the burden on terminals. The effect of saving signaling overhead, improving system performance, and reducing processing burden

Inactive Publication Date: 2009-12-09
HUAWEI TECH CO LTD
View PDF0 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The disadvantage of this solution is that: the terminal needs to make judgments based on the estimated downlink channel characteristic information, and decide the codebook to use, which requires a large amount of calculation and increases the burden on the terminal; while the base station needs to pre-store the codebook, due to

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, terminal, base station and communication system for transmitting channel characteristic information
  • Method, terminal, base station and communication system for transmitting channel characteristic information
  • Method, terminal, base station and communication system for transmitting channel characteristic information

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0034] Method Example 1

[0035] This embodiment takes a Multiple Input Multiple Output (Multiple Input Multiple Output, hereinafter referred to as: MIMO) system as an example for description. Such as figure 1 As shown, this embodiment provides a method for sending channel characteristic information, which includes the following steps:

[0036] Step 101: The terminal performs channel estimation on the downlink channel to obtain first downlink channel characteristic information.

[0037] Specifically, the downlink channel characteristic information can be estimated based on the downlink pilot signal from the base station. For example, the downlink pilot signal received by the terminal can be expressed as: h d ·S+n, where: h d Represents the actual downlink channel characteristic information, s represents the pilot symbol sent by the base station to the terminal for channel estimation, and n represents noise information. According to existing estimation algorithms such as Least Squ...

Example Embodiment

[0049] Method Example 2

[0050] In this embodiment, a space division multiple access (Space Division Multiple Access, hereinafter referred to as SDMA) system is taken as an example for description. Such as figure 2 As shown, this embodiment provides a method for sending channel characteristic information, which includes the following steps:

[0051] Step 201: The terminal performs channel estimation on the downlink channel to obtain first downlink channel characteristic information.

[0052] Specifically, the downlink channel can be estimated according to the downlink pilot signal from the base station, and the obtained characteristic estimation value of a certain downlink subcarrier is expressed as

[0053] Step 202: Differentially modulate the first downlink channel characteristic information into at least one uplink pilot symbol to obtain an uplink pilot modulation symbol, and send it to the base station.

[0054] Since in the SDMA system, the multi-antenna transmission mode...

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 embodiment of the invention provides a method, a terminal, a base station and a communication system for transmitting channel characteristic information, wherein the method comprises the following steps: obtaining first downlink channel characteristic information by the terminal; differentiating and modulating the first downlink channel characteristic information into at least one uplink pilot frequency signal to obtain an uplink pilot frequency modulation signal; and transmitting the uplink pilot frequency modulation signal to the base station. The invention feeds back the estimation value of a downlink channel through modulating the downlink channel characteristic information on pilot frequencies of a plurality of uplink channels so as to lead the base station to obtain the characteristics of the uplink channels and the downlink channels, thereby greatly saving the signaling cost; and the invention increases the detection of the uplink pilot frequency signal through adopting a differential modulation mode, and is beneficial to extracting the downlink channel characteristic information.

Description

technical field [0001] Embodiments of the present invention relate to a wireless communication technology, and in particular to a method for transmitting channel characteristic information in a wireless communication system, a terminal, a base station, and a communication system. Background technique [0002] In a wireless communication system, in order to improve communication quality, it is usually necessary to perform channel estimation on the transmission physical channel. For example, when the downlink is used to implement pre-equalization in the SISO system or precoding in the MIMO system, the channel characteristics of the downlink channel need to be known, so the downlink channel needs to be estimated. [0003] In an existing channel estimation scheme, the terminal estimates the downlink channel characteristic information according to the forward common pilot signal from the base station, and calculates the optimal precoding matrix. The index number of the precoding ...

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
IPC IPC(8): H04B1/707H04L1/06H04L25/03H04L27/26
Inventor 阮卫杜颖钢
Owner HUAWEI TECH CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap