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An Improved Generation Method for Polyphase Filter

A technology of polyphase filter and filter, which is applied in the direction of multi-terminal pair network, impedance network, electrical components, etc., can solve the problems of influence processing, signal frequency band judgment deviation, etc., and achieve the effect of eliminating inter-spectrum interference

Inactive Publication Date: 2018-06-19
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in actual engineering, it is impossible to generate an ideal filter, which makes it possible for the two filters to have signal output when the signal falls between the two filters during polyphase filtering, thus It makes the frequency band judgment of the signal deviate, which affects the subsequent processing

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  • An Improved Generation Method for Polyphase Filter
  • An Improved Generation Method for Polyphase Filter
  • An Improved Generation Method for Polyphase Filter

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Embodiment Construction

[0022] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the implementation methods and accompanying drawings.

[0023] This example provides a kind of polyphase filter that obtains based on the improved generation method for polyphase filter of the present invention, and this embodiment is based on the digital circuit of FPGA, and the signal of processing is the digital signal through ADC sampling, and sampling rate It is 1.25GHz, and the bandwidth of each channel is 156.25MHz. In this embodiment, only signals from 100 MHz to 500 MHz are processed, that is, only the first to third channels in the polyphase filter need to be used.

[0024] Such as figure 1 Shown is the system flow chart of the embodiment, including ADC data sampling and complement code conversion of its sampled data, sending the processed data into the polyphase filter channel, p...

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Abstract

The invention discloses an improved generating method for a polyphase filter, which belongs to the field of radio technology. The present invention comprises the following steps: according to the work requirement parameter, the FIR filter is generated based on the window function method of the FIR filter; the FIR filter is divided into n first sub-filters to form n-way polyphase filter banks, wherein n≥2 ; The FIR filter is divided into n second sub-filters again, the second sub-filter after adjusting the passband is used as a baseband filter, and a baseband filter is added between two adjacent first sub-filters, The passband of the added baseband filter is between the stopbands of the connected two first sub-filters. The invention is used in polyphase filters and can effectively eliminate the interspectral interference between filter groups.

Description

technical field [0001] The invention relates to the technical field of software radio, and in particular relates to improving polyphase filters. Background technique [0002] The ideal structure of the software radio system is a low-pass sampling structure. The bandwidth of the RF signal sampled by the low-pass sampling structure is the widest, and the number of channels that can be processed in parallel is the largest. Because the low-pass sampling structure uses the same sampling frequency for signals in all bands, the baseband signals after digital frequency conversion are all in a serious oversampling state. Although oversampling is beneficial to improve the signal-to-noise ratio of the signal, its high output data rate requires subsequent signal processing to have a very high processing speed. Therefore, how to effectively reduce the data rate of the signal without signal distortion, thereby reducing the speed of subsequent signal processing such as synchronization and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03H7/00H03H7/21
CPCH03H7/00H03H7/21
Inventor 李桓谢严朋
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA