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

A Multiple Access Collision Detection Method for Chirp Modulation Communication System

A technology of communication system and detection method, applied in modulation carrier system, frequency modulation carrier system, transmission system, etc., capable of solving problems such as frame corruption and channel conflict

Active Publication Date: 2021-11-02
NANJING UNIV OF POSTS & TELECOMM
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its MAC layer adopts the pure ALOHA working mechanism, and the terminal directly sends data without detection, and the channel is prone to conflict and frame destruction

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
  • A Multiple Access Collision Detection Method for Chirp Modulation Communication System
  • A Multiple Access Collision Detection Method for Chirp Modulation Communication System
  • A Multiple Access Collision Detection Method for Chirp Modulation Communication System

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0029] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention.

[0030] In an embodiment of the present invention, a multiple access conflict detection method for a Chirp modulation communication system is provided. Each branch in the Chirp modulation communication system demodulates the currently reached Chirp modulation signal S with an amplitude of A in a concurrent manner. (t), and after demodulation, obtain the independent spectrum diagram corresponding to each branch by FFT transformation, specifically include steps as follows:

[0031] S1. Judging the status of each branch in the Chirp modulation communication system:

[0032] S11. Obtain the first peak P1, the second peak P2, and the third peak P3 in the independent spectrum diagra...

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 multiple access conflict detection method for a Chirp modulation communication system. All branches in the Chirp modulation communication system demodulate a Chirp modulation signal S(t) with an amplitude A currently reached in a concurrent manner, and After demodulation, the independent spectrum diagram corresponding to each branch is obtained through FFT transformation. First, the first peak P1, the second peak P2, and the third peak P3 in the independent spectrum diagram of the branch after FFT transformation are obtained; then, set A threshold value, judge the size relationship between the first peak value and the threshold value in the frequency spectrum, and judge the size relationship between the second or third peak value and the threshold value based on this relationship condition, and judge the branch as multiple access conflict and single station occupation based on these two relationships and idle; finally, according to the state relationship of all branches, it is determined that the channel contention state in the Chirp modulation communication system is one of idle, single station occupation or multiple address conflict; the present invention can detect Chirp modulation communication The channel contention status of the system can be used in the design and implementation of LoRa high-throughput scheduling schemes.

Description

technical field [0001] The invention belongs to the technical field of Chirp modulation communication, is applied to multiple access conflict detection of a Chirp modulation communication system, and specifically relates to a multiple access conflict detection method for a Chirp modulation communication system. Background technique [0002] LoRa is an ultra-long-distance wireless transmission scheme based on linear spread spectrum technology. Its MAC layer adopts the pure ALOHA working mechanism, and the terminal directly sends data without detection, and the channel is prone to conflict and cause frame destruction. And as the load increases, the probability of channel collision increases accordingly, and the throughput performance of the system drops sharply; for details, please refer to the literature: LoRaAlliance.V 1.0.2.LoRaWAN TMSpecification[S].Dec.5th,2017. [0003] The physical layer in LoRa adopts the CSS (Chirp Spread Spectrum) modulation method, and the Chirp mo...

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): H04L27/12H04L27/144H04W72/04
CPCH04L27/12H04L27/144H04W72/0453
Inventor 王文鼐柏琛吴炜王斌
Owner NANJING UNIV OF POSTS & TELECOMM
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