Fusion code index-modulated multi-ary differential chaos shift keying modem

A modem and shift keying technology, applied in the modulation carrier system, multi-carrier system, phase modulation carrier system and other directions, can solve the problems of low transmission data rate and energy efficiency, difficulty in broadband transmission, etc., to improve the transmission data rate, reduce complexity, and eliminate the effects of delay circuits

Inactive Publication Date: 2017-06-09
XIAMEN UNIV
View PDF4 Cites 7 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problems that the existing differential chaotic shift keying modem does not carry information for half a symbol period, which leads to the low transmission data rate and energy efficiency of the system, and the difficulty in realizing broadband transmission, etc. The multi-ary system differential chaotic shift keying modem modulated by the fusion code subscript modulation using the delay unit and improving the transmission data rate of the system at the same time

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
  • Fusion code index-modulated multi-ary differential chaos shift keying modem
  • Fusion code index-modulated multi-ary differential chaos shift keying modem
  • Fusion code index-modulated multi-ary differential chaos shift keying modem

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0050] Suppose that the chaotic carrier is generated by discrete Logistic mapping, and the sampling frequency of the signal is set to f s =1000 times / s, the duration of the symbol is T=0.08s, then the equivalent spreading factor is defined as β=T×f s =80. The logistic mapping equation that generates the chaotic signal is When given the initial value x(0), by iterative formula x(i+1)=1-2×x 2 (i), i=0,....,i,....,β-1, can generate a chaotic carrier sequence of length β (spreading factor is β) The construction method of the n-order Walsh code is w n =[w n-1 w n-1 ;w n-1 -w n-1 ], P represents the Walsh code length, satisfying P=2 n .

[0051] The modulator is based on the chaotic carrier sequence generated above, as figure 2 The modulator shown completes the modulation, and its transmitted signal in each symbol period can be expressed as

[0052]

[0053] where E s represents the symbol energy, spreading factor SF = β, {x i ,i=1,...,R} is a discrete chaotic seq...

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 provides a fusion code index-modulated multi-ary differential chaos shift keying modem and relates to the field of wireless communication, wherein a receiver is free of any delay unit. Meanwhile, the fusion code index-modulated multi-ary differential chaos shift keying modem improves the system transmission data rate. The subscript value of a Walsh code is adopted as a carrier for the transmission of information bits, so that the number of bits transmitted by the system is improved. The transmission data rate and the energy efficiency of the system are improved effectively. In the orthogonal code multiplexing manner, delay units are effectively eliminated, and the complexity of system implementation is lowered. The simulations of AWGN channels and multi-path rayleigh fading channels show that, compared with the conventional DCSK, the fusion code index-modulated multi-ary DCSK system has certain performance advantages.

Description

technical field [0001] The invention relates to wireless communication, in particular to a multi-ary system differential chaotic shift keying modem modulated by fusion code subscripts. Background technique [0002] Chaotic signal is not only easy to generate, but also has low cost. It has the characteristics of broadband, aperiodic and noise-like, which makes the chaotic communication system with chaotic signal as the carrier become a low-cost alternative to the traditional spread spectrum communication system. At the same time, chaotic communication also has strong competitiveness in secure communication, short-distance communication and ultra-wideband communication systems. Differential Chaotic Shift Keying (DCSK: Differential Chaotic Shift Keying), as a kind of chaotic communication system, has the advantages of general chaotic communication system. And the DCSK system has a very simple receiver structure, and has good performance in multipath fading channels and time-va...

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): H04L27/00H04L27/20H04L27/22H04L27/36
CPCH04L27/001H04L27/20H04L27/22H04L27/362
Inventor 谭云生徐位凯王琳洪少华
Owner XIAMEN UNIV
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