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Improved generation method of multiphase filter

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

Inactive Publication Date: 2016-08-31
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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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

Method used

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  • Improved generation method of multiphase 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 generation method of a multiphase filter, and belongs to the field of radio techniques. The method comprises the following steps of according to operation requirement parameters, generating an FIR filter based on a window function method of the FIR filter; dividing the FIR filter into n first sub-filters, to form n multiphase filter banks, wherein n is more than and equal to 2; further dividing the FIR filter into n second sub-filters, using second sub-filters of which the passband is adjusted as baseband filters, and adding the baseband filter between each two adjacent first sub-filters, wherein the passband of the added baseband filter is within the stop band of the two first sub-filters connected therewith. The method is applied to the multiphase filter, and can effectively eliminate spectral interference between the filter banks.

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