Unlock instant, AI-driven research and patent intelligence for your innovation.

Multi-sequence spread spectrum communication method and system based on index modulation

A multi-sequence spread spectrum and index modulation technology, applied in transmission systems, ultrasonic/acoustic/infrasonic transmission systems, electrical components, etc., and can solve problems such as low communication rates in multi-sequence spread spectrum communication systems

Active Publication Date: 2021-11-09
XIAMEN UNIV
View PDF6 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention solves the problem that the communication rate of the current multi-sequence spread spectrum communication system is low, and proposes a multi-sequence spread spectrum communication method and system that improves the communication rate and ensures system performance by group cyclic shift index modulation

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
  • Multi-sequence spread spectrum communication method and system based on index modulation
  • Multi-sequence spread spectrum communication method and system based on index modulation
  • Multi-sequence spread spectrum communication method and system based on index modulation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0036] In order to make the purposes, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0037] A multi-sequence spread spectrum communication method based on index modulation, such as figure 1 As shown, the communication sending step specifically includes: grouping operation: dividing the original signal into k groups, and then dividing each group into index bits b used to determine the index bits in turn IM and information bits b for constellation modulation;

[0038] Process the information bit sequence of the i-th group of signals: the information bit sequence is passed through the serial-to-parallel conversion module and the constellation modulation module to obtain J constellation symbols s(i, 1)...s(i, J), where J is the superimpos...

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 multi-sequence spread spectrum communication method and system based on index modulation, and the method comprises the following steps: communication transmission: grouping original signals, performing index modulation on each group, and determining the offset by the index bit in the group, wherein the information sequence in the group is used for constellation modulation, and information in the group is transmitted after being subjected to index modulation and superposed with a pilot signal; communication receiving: performing channel estimation on the received signal by using the pilot signal, correcting the received signal according to a channel parameter obtained by estimation, then de-spreading the signal, estimating an index bit sequence by using an index estimation algorithm, and then recovering the bit sequence. According to the method, index modulation is added on the basis of the MSSS, the cyclic displacement of the spread spectrum sequence is used as index information for carrying extra information for different superposed sequences, different spread spectrum sequences share the same pilot signal for channel estimation within the coherence time, and the information transmission rate is improved on the basis of the MSSS.

Description

technical field [0001] The invention belongs to the technical field of spread spectrum in wireless communication, in particular to a multi-sequence spread spectrum system and method based on packet cyclic shift index modulation. Background technique [0002] Underwater acoustic communication is one of the hot research directions in the field of wireless communication in recent years. Underwater acoustic channel has unique advantages in the field of marine communication, and has a wide range of applications in underwater positioning, navigation, ranging and so on. The underwater acoustic communication channel is worse than the usual wireless channel, the multipath fading and Doppler effect are serious, the channel is time-varying rapidly, and the received signal-to-noise ratio is low. [0003] The traditional underwater acoustic communication spread spectrum technology adopts the direct sequence spread spectrum (DSSS) method. The direct sequence spread spectrum has the advant...

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): H04B1/69H04B11/00H04B13/02
CPCH04B1/69H04B11/00H04B13/02
Inventor 徐位凯朱正杰王琳
Owner XIAMEN UNIV
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

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

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com