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

Adaptive modulation for wireless networks

A modulation scheme and adaptation technology, applied in the field of modulation scheme selection and control, can solve problems such as deterioration of system response

Inactive Publication Date: 2004-06-23
KK TOSHIBA
View PDF0 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The main disadvantage of the currently used method is that when adaptive modulation is applied on the resulting uplink or downlink, the response of the system can be severely degraded if different results between links are not taken into account

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
  • Adaptive modulation for wireless networks
  • Adaptive modulation for wireless networks
  • Adaptive modulation for wireless networks

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0026] The described embodiment of the invention concerns two terminals, terminal A and terminal B, communicating with each other over two communication links, here referred to as an uplink and a downlink. Accordingly, sending data from terminal A to terminal B will take place on the uplink, and sending data from terminal B to terminal A will take place on the downlink.

[0027] image 3 A representation of the data throughput on a link between two terminals under different noise and interference conditions is shown. exist figure 1 In the configuration shown, terminals A and B are communicating with each other and an interferer is affecting the link between them. Noise will also affect the channel. image 3 It shows the degree of interference, that is, the signal-to-interference ratio (CIR, channel to interference ratio), and the ratio of bit energy to noise density (E b / N o ), followed by energy to noise ratio (energy to noiseratio), the impact on the throughput of one ...

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

This invention relates to communication between terminals. Where communication is over an ideal channel then a high throughput modulation scheme can be used. Where the terminals suffer interference or noise, transmission can be modified to a more robust modulation scheme. The modulation scheme for a signal to be transmitted from the terminal is normally selected based up measurements made on a signal received by the terminal. However, the uplink and downlink between two terminals may not be experiencing the same interference and noise. For example, an interfering source may affect one terminal more than another. Under these circumstances, the terminal will not get a good picture of the status of the channel or link over which it is about to transmit. Therefore, the invention provides a system where quality information is passed from the terminal receiving a signal to the terminal which sent the signal to help to determine the most appropriate modulation scheme.

Description

technical field [0001] The invention relates to the selection and control of the modulation scheme used in a communication channel between two terminals. Background technique [0002] When two terminals communicate with each other, whether wireless or otherwise, the choice of a modulation scheme for a communication channel can significantly affect the throughput of that channel on the link and the channel's ability to reject noise. In particular, it is advantageous to use a modulation scheme with a high throughput rate and little error correction when the channel quality is good, and relatively speaking, to use a modulation scheme with a lower throughput rate when the channel is affected by noise or interference. But a modulation scheme with better noise immunity. The difficulty in choosing an appropriate modulation scheme is that the environment is so unstable that the noise may be low in one situation and high in another. In these cases, the most reliable and noise-rejec...

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 Applications(China)
IPC IPC(8): H03M13/47H04B7/26H04L1/00H04L1/16H04L1/18H04L1/20H04L27/18
CPCH04L1/0025H04L1/1614H04L1/1809H04L1/0003H04L27/18H04L1/1671H04L1/20
Inventor 拉斐尔·A·C罗皮兹迈克尔·P·费登
Owner KK TOSHIBA
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