Design method for perfect reconstruction filter group based on frequency curling and cosine modulation

A technology of cosine modulation and complete reconstruction, which is applied to electrical components, digital technology networks, impedance networks, etc., can solve the problems of reducing system flexibility and increasing complexity of masking filter layers, so as to improve flexibility and reduce complexity , Good reconfigurability effect

Active Publication Date: 2017-05-31
SHANDONG UNIV
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Problems solved by technology

However, the methods mentioned above can only partially achieve reconfigurability, which means that the passband generation layer can only provide several spectrum division schemes, and it is also necessary to design different masking filters for each spectrum division scheme
Therefore, the passband generation layer should avoid too many spectrum division schemes, because this will greatly increase the complexity of the masking filter layer, thereby reducing the flexibility of the entire system

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  • Design method for perfect reconstruction filter group based on frequency curling and cosine modulation
  • Design method for perfect reconstruction filter group based on frequency curling and cosine modulation
  • Design method for perfect reconstruction filter group based on frequency curling and cosine modulation

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Embodiment Construction

[0045] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0046]First design a prototype filter, h(n) is the coefficient expression of the prototype filter, the length of h(n) is N, after cosine modulation, M+1 subbands are obtained, and M is the parameter of cosine modulation. h i (n) is the coefficient expression of the i-th cosine modulation subband, i ranges from 0 to M, and the equation is as follows

[0047]

[0048] c when i=1, L, M-1 i =1, when i=0, M c i = 2

[0049]

[0050] h i (z) is the z-transform of the ith cosine-modulated subband,

[0051] The spectral division of each subband is as figure 1 shown, from figure 1 It can be seen that the distance between the center frequencies of every two adjacent subbands is π / M. A well-known approach to frequency warping with digital filters is to replace the delay elements with an all-pass system. The expression of the all-pass filter G(Z) is ...

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Abstract

The invention discloses a design method for a perfect reconstruction filter group based on frequency curling and cosine modulation. The filter group comprises three frequency curling modules. One module is used for mapping a uniform subband into a new frequency domain generation passband. The second and the third modules are used for mapping an original masking filter into a target masking filter. Therefore, no matter there are how many possible passband generation modules, only the two original filters need to be designed, so that system complexity is greatly reduced, and meanwhile flexibility is improved. The problem about the relation between frequency curling parameters of the passband generation module and the masking filter module is solved, parameter values of the all-pass system under various conditions are pre-designed in a unified manner, and then any scheme can be directly achieved via the method of changing the parameter value without changing a system structure.

Description

technical field [0001] The invention relates to a design method of a complete reconstruction filter bank based on frequency warping and cosine modulation. Background technique [0002] Filter banks are widely used in wireless communication, video and audio processing, and other signal processing. [0003] Currently, a fixed-bandwidth filter bank means that the bandwidth of each passband of the filter bank is fixed. In recent years, filter banks used in software-defined radios and digital hearing aids need to have different sub-band division methods to adapt to different application situations. Therefore, reconfigurable filter banks whose cutoff frequency can be changed without changing the structure are more and more attractive. [0004] The current main methods include the filter bank design method for multi-protocol wireless communication receivers, the structure of the filter bank designed by this method has a low complexity, and has reconfigurable features in both the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03H17/02
CPCH03H17/0202H03H17/0294H03H2017/0072
Inventor 魏莹马彤
Owner SHANDONG UNIV
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