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

Adaptive modulation-demodulation control device and method

An adaptive modulation and control device technology, applied to electrical components, orthogonal multiplexing systems, multiplexing communications, etc., can solve problems such as large error codes, unfavorable system implementation, and transmission interruption

Inactive Publication Date: 2005-09-14
INFORMATION TECH LAB
View PDF0 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In a general communication system, using a fixed modulation mode can ensure correct data transmission when the channel conditions meet the transmission requirements, but when the channel quality deteriorates, the transmission is interrupted due to too many errors; the existing self-adaptive The modulation and demodulation scheme selects the appropriate modulation mode according to the channel quality, but the algorithm is too complicated when evaluating the channel quality, which is not conducive to system implementation

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-demodulation control device and method
  • Adaptive modulation-demodulation control device and method
  • Adaptive modulation-demodulation control device and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0019] Other purposes, characteristics and advantages of the present invention can be better understood through the detailed description of the embodiments of the adaptive modulation and demodulation control device and its implementation method according to the present invention below in conjunction with the accompanying drawings.

[0020] see figure 1 Describe the structure of the adaptive modulation and demodulation control device of the present invention. Such as figure 1 As shown, the adaptive modulation and demodulation control device is composed of a signal error estimator 101 , a forward error detection decision unit 102 , and an adaptive modulation and demodulation decision unit 103 . Among them, the signal error estimator 101 is used to estimate the error between the actual signal and the decision signal; the forward error detection decision unit 102 is used to check whether there is an error in the decoded bit stream; the adaptive modulation and demodulation decisio...

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 puts forward an adaptive modem control device for regulating the modulation mode of each sub-carrier in channels with different S / N ratios for OFDM communication system and a method. Said device includes a signal error calculator, a forward error detection decider and an adaptive modulation / demodulation decider, said control device can apply high order modulation mode when the channel quality is good to increase channel transmission data rate and apply low order modulation mode when the quality is poor to ensure continuous communication.

Description

technical field [0001] The present invention relates to a method and system for digital wireless communication, in particular to an adaptive modulation and demodulation control method for communication quality in an Orthogonal Frequency Division Multiplexing (OFDM) communication system, and a wireless communication using this method for communication device. Background technique [0002] In a general communication system, using a fixed modulation mode can ensure correct data transmission when the channel conditions meet the transmission requirements, but when the channel quality deteriorates, the transmission is interrupted due to too large a bit error; the existing self-adaptive The modulation and demodulation scheme, selects the appropriate modulation mode according to the channel quality, but the algorithm is too complicated when the channel quality is evaluated, which is not conducive to the system implementation. Contents of the invention [0003] The purpose of 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 Applications(China)
IPC IPC(8): H04J11/00H04L27/01
Inventor 赵继安孙勇王思业
Owner INFORMATION TECH LAB
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