Signal modulation and demodulation method based on constellation structure optimization and honeycomb-like region judgment

A signal modulation and demodulation method technology, applied in the modulation carrier system, digital transmission system, multi-carrier system and other directions, can solve the problem of reducing the constellation diagram, increasing, etc., to increase the CFM, and realize the anti-noise performance of the modulation format. effect on system bit error rate performance, improved SNR efficiency, and noise immunity

Active Publication Date: 2020-04-17
NANJING UNIV OF INFORMATION SCI & TECH
View PDF4 Cites 10 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to aim at the deficiencies of the above-mentioned prior art, reduce the average power of the constellation diagram as much as possible through the optimization design of the constellation geometry, increase the CFM of the constellation diagra...

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
  • Signal modulation and demodulation method based on constellation structure optimization and honeycomb-like region judgment
  • Signal modulation and demodulation method based on constellation structure optimization and honeycomb-like region judgment
  • Signal modulation and demodulation method based on constellation structure optimization and honeycomb-like region judgment

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment 1

[0037] Such as figure 1 As shown, taking the 16QAM format as an example, the modulation and demodulation process mainly includes three stages: constellation structure optimization design, probabilistic shaping constellation mapping, and cellular-like area judgment. The workflow of the whole modulation process is: the constellation structure optimization design stage, with the design principle of maximizing the constellation performance index, the minimum Euclidean distance d between constellation points min Under the condition of being fixed at 1, through the optimization design of the geometric structure, the average Euclidean distance between the constellation points is reduced as much as possible, the average power of the constellation diagram is reduced, the constellation performance index is improved, and the geometric positions of the 16 constellation points in the constellation diagram are designed;

[0038] In the probability forming constellation mapping stage, accord...

specific Embodiment 2

[0057] Taking the 32QAM format as an example, the modulation and demodulation process mainly includes three stages: constellation structure optimization design, probability shaping constellation mapping, and honeycomb-like area judgment. The workflow of the whole modulation process is: the constellation structure optimization design stage, with the design principle of maximizing the constellation performance index, the minimum Euclidean distance d between constellation points min Under the condition of being fixed at 1, through the optimization design of the geometric structure, the average Euclidean distance between the constellation points is reduced as much as possible, the average power of the constellation diagram is reduced, the constellation performance index is improved, and the geometric positions of the 32 constellation points in the constellation diagram are designed; probability shaping In the constellation mapping stage, according to the Maxwell Boltzmann distribut...

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 signal modulation and demodulation method based on constellation structure optimization and honeycomb-like region judgment. The method comprises the following steps: converting bit data from one path of data into multiple paths of parallel data through serial-to-parallel conversion; then carrying out distribution matching to obtain non-uniformly distributed QAM symbols; performing constellation mapping according to a designed structure-optimized constellation mapping rule by using probability shaping and combining a Gray-like mapping rule; modulating the QAM symbol information after constellation mapping to an optical carrier, then transmitting the QAM symbol information to a receiving end, and restoring the QAM symbol information after constellation mapping by the receiving end to obtain QAM symbol information after constellation mapping; determining a honeycomb-like constellation judgment area according to the positions of the constellation points, and removing the dispersion phenomenon of the QAM symbol information in the transmission process; and then performing the constellation de-mapping, inverse distribution matching and parallel-to-serial conversion successively to obtain bit data. According to the method, the anti-noise performance of the modulation format and the bit error rate performance of the system are improved.

Description

technical field [0001] The invention belongs to the technical field of communication, and in particular relates to a signal modulation and demodulation method based on constellation structure optimization and honeycomb-like region judgment. Background technique [0002] With the rise of high-speed new services such as high-definition video, augmented reality / virtual reality (AR / VR), Internet of Things, big data, and cloud computing, people's demand for network traffic is growing exponentially. To meet this demand, the optical access network, as a bridge connecting the customer premises network and the metropolitan area network / backbone network, must provide better bandwidth performance. Compared with coherent detection systems, intensity modulation / direct detection (IM / DD) is widely used in short-distance communication systems due to its advantages in cost, energy consumption, and packaging. At the same time, advanced modulation formats have higher spectral efficiency and c...

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
IPC IPC(8): H04L27/34
CPCH04L27/3405
Inventor 刘博张丽佳毛雅亚任建新忻向军孙婷婷赵立龙吴泳锋刘少鹏宋真真王俊锋哈特沈磊李良川王光全
Owner NANJING UNIV OF INFORMATION SCI & TECH
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