Design method of prototype filter in alternate FBMC-QAM system

A prototype filter and design method technology, applied in baseband systems, transmission systems, multi-frequency code systems, etc., can solve problems such as inter-symbol interference and non-support of traditional MIMO technology

Active Publication Date: 2018-12-07
GUILIN UNIV OF ELECTRONIC TECH
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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

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  • Design method of prototype filter in alternate FBMC-QAM system
  • Design method of prototype filter in alternate FBMC-QAM system
  • Design method of prototype filter in alternate FBMC-QAM system

Examples

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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 prototype filters of odd and even channels designed by the method of the present invention, especially the stopband performance of ...

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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

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Application Information

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Patent Type & Authority Applications(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
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