Filter bank multi-carrier sub-band filter

A filter bank and filter technology, applied in the direction of impedance network, adaptive network, electrical components, etc., to achieve the effect of simplifying the composition structure, improving filtering efficiency and fast filtering

Pending Publication Date: 2020-12-04
安徽蓝讯电子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This group of filters is modulated by the same prototype low-pass filter. Note that the filter must satisfy the Nyquist no-symbol interference theorem, and suppress the side lobes very small... It is this filtering process that causes relative OFDM Additional Computational Complexity

Method used

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  • Filter bank multi-carrier sub-band filter

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Experimental program
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Effect test

Embodiment 1

[0014] Such as figure 1 A filter bank multi-carrier sub-band filter is shown, including analysis filter bank, synthesis filter bank and sub-band processor, an M channel cosine modulation filter bank includes M branches, and the input signal is generated by the analysis filter bank Decompose into M subbands, and the subbands have the same bandwidth and sampling factor;

[0015] The analysis filter bank splits the original signal into a series of subband signals, with a standard center frequency ω m =2πn / M and the same bandwidth 2π / M, where m=1...M-1, the integrated filter bank eliminates the aliasing components of each subband to achieve complete reconstruction;

[0016] The subband adaptive filter is time-varying and unknown, and the aliasing component cannot be eliminated by a single fixed synthesis prototype filter after reconstruction and superposition, so the synthesis prototype filter needs to be time-varying and can be used at any subband filters matched in time;

[0...

Embodiment 2

[0021] Different from Embodiment 1, the analysis filter bank divides the original signal into a series of subband signals with standard center frequency ω m =2πn / M and the same bandwidth 2π / M, where m=1, the integrated filter bank eliminates the aliasing components of each subband to achieve complete reconstruction;

[0022] On the basis of the above, an M channel cosine modulation filter bank includes M branches, and the input signal is decomposed into M subbands by the analysis filter bank, and the subbands have the same bandwidth and sampling factor;

[0023] The analysis filter bank is composed of a first analysis filter, a second analysis filter and a third analysis filter, and the synthesis filter bank is composed of a first synthesis filter, a second synthesis filter and a third synthesis filter , different analysis filters are connected with different synthesis filters. When multi-carrier signal processing is performed, the signal processing speed can be greatly improv...

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Abstract

The invention discloses a filter bank multi-carrier sub-band filter, and particularly relates to the field of filter bank multi-carriers, the filter bank multi-carrier sub-band filter comprises an analysis filter bank, a comprehensive filter bank and a sub-band processor, one M-channel cosine modulation filter bank comprises M branches, an input signal is decomposed into M sub-bands by the analysis filter bank, wherein the sub-bands have the same bandwidth and sampling factor; the analysis filter bank divides an original signal into a series of sub-band signals, the standard center frequency [omega]m = 2[pi]n / M and the same bandwidth 2[pi] / M are achieved, m = 1 to M-1, and the comprehensive filter bank eliminates aliasing components of all sub-bands to achieve complete reconstruction. According to the method, the complexity in the filtering calculation process is reduced, so that the filter bank multicarrier can quickly filter the multicarrier signal, and the filtering efficiency in the filter bank multicarrier is improved.

Description

technical field [0001] The present invention relates to the field of filter bank multi-carrier, more specifically, the invention relates to a filter bank multi-carrier sub-band filter. Background technique [0002] Filter bank multi-carrier trades for lower out-of-band power leakage at the cost of increased implementation complexity; strengthens the limitation of modulation modes in exchange for higher spectral efficiency. A set of parallel sub-band filters is used to filter the multi-carrier signal. This group of filters is modulated by the same prototype low-pass filter. Note that the filter must satisfy the Nyquist no-symbol interference theorem, and suppress the side lobes very small... It is this filtering process that causes relative Additional computational complexity of OFDM. Contents of the invention [0003] In order to overcome the above-mentioned defects of the prior art, an embodiment of the present invention provides a filter bank multi-carrier sub-band fil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03H21/00
CPCH03H21/00
Inventor 尹桂芳汪海港张主霖
Owner 安徽蓝讯电子科技有限公司
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