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Channelizer Design Method and Device Based on Approximately Exact Reconstruction Filter Bank

A technology for reconstructing filters and filter banks, applied in electrical components, radio transmission systems, transmission systems, etc., can solve the problems of large computing resources and storage resource overhead, degradation, etc., and achieve the effect of reducing implementation complexity and overhead.

Active Publication Date: 2018-07-13
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in practical engineering applications, high-order accurate reconstruction filter banks require a lot of computing resources and storage resource overhead, which brings great pressure to hardware implementation.
On the other hand, the exact reconstruction filter bank coefficients are much more sensitive to fixed-point quantization than the approximate exact reconstruction filter bank coefficients. Quantization effects will still degenerate it into an approximately exact reconstruction filter bank

Method used

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  • Channelizer Design Method and Device Based on Approximately Exact Reconstruction Filter Bank
  • Channelizer Design Method and Device Based on Approximately Exact Reconstruction Filter Bank
  • Channelizer Design Method and Device Based on Approximately Exact Reconstruction Filter Bank

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Experimental program
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Effect test

Embodiment 1

[0042] Such as image 3 As shown, a channelizer design method based on approximately exact reconstruction filter bank, including the following steps:

[0043] S1: Determine the channel number M of the modulation filter bank, the multinomial component length m, and the reconstruction performance relaxation parameter ξ.

[0044] S2: Establish a low-order accurate reconstruction prototype filter h according to the multinomial component length m (2) (n).

[0045] S3: According to the reconstruction performance relaxation parameter ξ and low-order accurate reconstruction prototype filter h (2) (n) Establish a low-order approximate exact reconstruction prototype filter

[0046] S4: Accurate reconstruction of the prototype filter according to the number of channels M and the low-order approximation The high-order approximate exact reconstruction prototype filter h(n) is calculated.

[0047] S5: performing complex exponential modulation on the high-order approximate exact reco...

Embodiment 2

[0078] Such as Figure 7 and Figure 8 As shown, a channelizer device based on an approximately exact reconstruction filter bank includes: an analysis module 1, which adopts an approximate exact reconstruction complex exponential modulation filter bank as an implementation structure, and is used to convert the frequency band occupied by each user from separated from the input signal. The sub-channel switching module 2 is configured to switch the sub-band signals of each user from the frequency domain to the expected position according to the switching control routing table. The synthesis module 3 adopts an approximate exact reconstruction complex exponential modulation filter bank as an implementation structure, and is used to reconstruct all sub-band signals after exchange processing into an output signal.

[0079] The above-mentioned channelizer device evenly divides the uplink / downlink channel into several basic subchannels, each user can occupy one or more adjacent basic...

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Abstract

The present invention belongs to the technical field of broadband satellite communications, and particularly relates to an approximate precision reconstruction filter bank-based channelizer design method and apparatus. The method comprises the steps of determining channel number of a modulation filter bank, multiple component lengths, and a reconstruction performance relaxation parameter; building a low-order precision reconstruction prototype filter according to the multiple component lengths; building a low-order approximate precision reconstruction prototype filter according to the reconstruction performance relaxation parameter; calculating to obtain a high-order approximate precision reconstruction prototype filter; and performing complex index modulation on the high-order approximate precision reconstruction prototype filter, so as to obtain an approximate precision reconstruction complex index modulation filter bank and an approximate precision reconstruction complex index modulation filter bank-based channelizer. The desired reconstruction error performance is described by using the reconstruction performance relaxation parameter, the system design demand is matched by flexibly adjusting the relaxation parameter, so that the lower-order filter is used in actual use, and the implementation complexity and overhead of the complex index modulation filter bank-based channelizer structure are lowered.

Description

technical field [0001] The invention belongs to the technical field of broadband satellite communication, and in particular relates to a channelizer design method and device based on an approximately accurate reconstruction filter bank. Background technique [0002] In broadband satellite communication systems, compared with fully regenerative payloads, digital channelized switching payloads have the advantages of lower equipment complexity, compatibility with various communication systems, and flexible routing and resource allocation through digital sub-channel switching methods , so it is favored by people. [0003] Among the existing digital channelization methods, the channelization technology based on the modulation filter bank is a more effective implementation structure. In the field of digital signal processing, the modulation filter bank is usually used for the separation and reconstruction of multi-carrier and multi-channel signals. Its advantage is that the desig...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/185
CPCH04B7/18578H04B7/18584
Inventor 晏坚凌伟程邓献策陆建华
Owner TSINGHUA UNIV