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

Nonlinear rainfall attenuation channel multiple amplitude and phase shift keying (MAPSK) optimal modulation method

A modulation method and non-linear technology, applied in the field of satellite communication, can solve problems such as the inability to ensure the effective use of spectrum, and achieve the effect of reducing bit error performance and resisting influence

Inactive Publication Date: 2014-09-03
NORTHWESTERN POLYTECHNICAL UNIV
View PDF2 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In broadband satellite communication, different frequencies are used in uplink and downlink to reduce the influence of non-linearity of rain attenuation. Although this method can reduce signal distortion, it cannot guarantee the effective use of spectrum.

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
  • Nonlinear rainfall attenuation channel multiple amplitude and phase shift keying (MAPSK) optimal modulation method
  • Nonlinear rainfall attenuation channel multiple amplitude and phase shift keying (MAPSK) optimal modulation method
  • Nonlinear rainfall attenuation channel multiple amplitude and phase shift keying (MAPSK) optimal modulation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0020] Now in conjunction with embodiment, accompanying drawing, the present invention will be further described:

[0021] The polarization attenuation coefficients m and n of rain fading are known to be 0.187 and 1.021. MAPSK uses the optimized 4-12APSK constellation signal, and compares it with the standard MAPSK signal to observe their bit error rate performance.

[0022] According to the present invention, its implementation process is as follows:

[0023] 1) All the parameters needed to calculate the rain fading are m=0.817, n=1.021 respectively, according to the unit nonlinear attenuation rainfall model based on Mie scattering Calculate the rainfall fading model as figure 1 shown.

[0024] 2) Simulate the constellation diagram of the standard MAPSK constellation after passing through the rain fading channel, and read the offset value d of each constellation point from the simulation result 1 , d 2 ,... d n , n represents the number of MAPSK constellation points, a...

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 relates to a nonlinear rainfall attenuation channel multiple amplitude and phase shift keying (MAPSK) optimal modulation method, which is characterized by comprising the following steps of: establishing a Mie-scattering-based unit nonlinear attenuated rainfall model, simulating a constellation diagram of a standard MAPSK constellation passing through a rainfall attenuation channel according to the nonlinear attenuated rainfall model, calculating a relative radius rhok and a minimum inter-ring distance dringi,ringi+1 of the standard MAPSK constellation, and constructing an MAPSK constellation diagram by using the relative radius rho'k=min(A'r*rhok, dringi,ringi+1) of the optimized constellation. According to the method, the influence of the nonlinear rainfall attenuation channel on MAPSK modulation can be effectively resisted, and the bit error rate performance of the optimized MAPSK constellation can be reduced by an order of magnitude.

Description

technical field [0001] The invention relates to a nonlinear rain attenuation channel MAPSK optimization modulation method for satellite communication. Background technique [0002] In the high-frequency satellite communication using MAPSK modulation, the influence of nonlinear rain attenuation is very serious. The research on the nonlinear rain attenuation channel of satellite channel is one of the key technologies to ensure the normal transmission of satellite channel signals. [0003] In broadband satellite communication, different frequencies are used in uplink and downlink to reduce the influence of non-linearity of rain attenuation. Although this method can reduce signal distortion, it cannot guarantee the effective use of spectrum. Contents of the invention [0004] technical problem to be solved [0005] In order to avoid the deficiencies of the prior art, the present invention proposes a nonlinear rain attenuation channel MAPSK optimization modulation method, whic...

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): H04L27/36H04B7/185
Inventor 郭淑霞高颖刘宁李瑛韩前进陈卫军刘琦李南京宋阳姜涛
Owner NORTHWESTERN POLYTECHNICAL UNIV
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