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

A Prototype Filter Design Method for Alternating FBMC-QAM Systems

A prototype filter and design method technology, applied in baseband systems, transmission systems, multi-frequency code systems, etc., can solve the problems of not supporting traditional MIMO technology, inter-symbol interference, etc.

Active Publication Date: 2021-03-19
GUILIN UNIV OF ELECTRONIC TECH
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims at the problem that the traditional FBMC-OQAM system has inherent intersymbol interference so that it does not support the traditional MIMO technology, and provides a prototype filter design method in the alternate FBMC-QAM system

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 Prototype Filter Design Method for Alternating FBMC-QAM Systems
  • A Prototype Filter Design Method for Alternating FBMC-QAM Systems
  • A Prototype Filter Design Method for Alternating FBMC-QAM Systems

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0116] Respectively use the frequency sampling method, the semidefinite programming method method and the method of the present invention to design the number of carrier channels N=64, the synthesis filter of odd and even subcarriers and the FBMC-QAM system of the analysis filter length being L=4N-1. In the design method of the present invention, δ=1×10 -3 . Table 1 shows the performance comparison of the FBMC-QAM system designed by each method, image 3 and Figure 4 The frequency-magnitude response plots of the odd and even subcarrier prototype filters in the FBMC-QAM system designed for each method, respectively. It can be seen from 1 that the method of the present invention obviously reduces the energy of the prototype filter, and the spectrum detection performance of the obtained FBMC-QAM system is better. Combining Table 1 and Figure 3-Figure 4 , it can be known that the method of the present invention designs the gained system to be inferior to document " A New Fil...

example 2

[0120] Design the FBMC-QAM system with carrier number N=256, odd and even subcarrier synthesis filter and analysis filter length L=4N-1. Figure 5 and Figure 6 The frequency-magnitude response comparison diagrams of the odd and even subcarrier prototype filters of the FBMC-QAM system, respectively. From Figure 6It can be seen that the document "Prototype filter design for QAM-based filter bank multicarrier system" (i.e. semi-definite programming method) and the reconstruction performance of the even channel filter obtained by the method of the present invention are better than the document "A New Filter-Bank Multicarrier System With TwoPrototype Filters for QAM Symbols Transmission and Reception" (that is, the frequency sampling method) is poor. However, the performance comparison of each algorithm is given in Table 2. It can be seen that the odd-numbered and even-numbered channel prototype filters designed by the method of the present invention, especially the stop-band ...

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 design method of a prototype filter in an alternate FBMC-QAM system. Firstly, it assumes that a synthesis filter bank and an analysis filter bank of odd and even sub-carriersin a circumambient FBMC-QAM system are respectively obtained by alternate modulation of four different prototype filters; secondly, design of the four prototype filters in the system is described asa convex optimization problem without constraints; an objective function thereof is the sum of stop band energy of inter-symbol interference (ISI), inter-carrier interference (ICI) and the prototype filter of the alternate FBMC-QAM system; on the basis of a gradient vector of the objective function obtained by derivation, an optimization problem is solved by adoption of a double-iteration mechanism; and finally, a synthesis filter and an analysis filter having better performances in the odd and even sub-carriers can be obtained. Compared with the prior art, the stop band energy of the prototype filter in the FBMC-QAM system designed in the invention is relatively low; the obtained FBMC-QAM system has better performances; and thus, an effective solution can be provided for designing a largeFBMC-QAM system.

Description

technical field [0001] The invention relates to the technical field of filter design, in particular to a design method for a prototype filter in an alternating FBMC-QAM system. Background technique [0002] In the FBMC system, the signal modulation and demodulation are realized respectively through the synthesis filter bank at the sending end and the analysis filter bank at the receiving end. The difference with OFDM is that FBMC replaces the IDFT / DFT module in the OFDM system with a filter bank with better spectrum constraints. The traditional FBMC system using OQAM modulation cannot directly apply this technology in MIMO due to its own inter-carrier interference and inter-symbol interference. To break through this limitation, the researchers proposed an FBMC-QAM system using two different prototype filters to transmit QAM symbols. [0003] Since the synthesis filter and analysis filter in the FBMC system are modulated by one or more prototype filters, the design of the p...

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): H04L27/26H04L25/03
CPCH04L25/03821H04L27/264
Inventor 蒋俊正赵海兵杨玉琳欧阳缮杨圣杨杰李龙斌李杨剑
Owner GUILIN UNIV OF ELECTRONIC TECH
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