Multi-phase filter digital channelization realization method

Abstract

The invention provides a multi-phase filter digital channelization realization method. The method comprises the following steps: (1) firstly quantizing an intermediate frequency signal as a digital signal through a digital/analog converter, and decreasing the digital signal to a baseband signal through a digital down-conversion module DDC; and (2) setting a sampling frequency fs, dividing into D sub-channels, performing D-times extraction at the front end of a multi-phase filter, enabling the extracted signal to enter the multi-phase filter to be filtered. The frequency band can be divided into multiple independent sub-band channels by using the digital channelization technology, the parallel computation can be realized among various sub-band channels. A computer simulation result verifiesthe correctness of the efficient structure. And meanwhile, the structure design is realized by using a FPGA, and the multi-channel parallel operation advantage is sufficiently reflected.

Description

technical field [0001] The invention belongs to the field of photoelectric communication, and in particular relates to a method for realizing digital channelization of polyphase filtering. Background technique [0002] Channelized receiver is a very promising signal receiver in current electronic systems, and it is widely used in various fields. The accuracy, resolution, and sensitivity of this receiver can reach the level of narrow-band heterodyne receivers, and it has 100% wideband receivers. It is these characteristics that channelized receivers are very adaptable to various signals; [0003] With the rapid development of DSP and FPGA, it has become a trend to replace traditional analog channelization technology with digital technology. According to the current soft radio receiver category, both RF low-pass sampling and band-pass sampling reduce the use of analog devices. With the current use of high-sampling rate A / D, two parallel sampling methods can achieve high speed...

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Problems solved by technology

[0003] With the rapid development of DSP and FPGA, it has become a trend to replace traditional analog channelization technology with digital technology. According to the current soft radio receiver category, both RF low-pass sampling and band-pass sampling reduce the use of analog devices. With the current use of high-sampling rate A/D, two parallel sampling methods can achieve high speed, but with the increase of sampling rate, another problem is how to solve the problem of high-speed A/D ch

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