Non maximum extraction system integrated filter bank construction method based on DFT

Abstract

The invention belongs to the field of software radio applications, and particularly relates to a non maximum extraction system integrated filter bank construction method based on DFT in a wide frequency band digital receiving and transmitting system, a voice signal processing system and a multi-carrier communication system. A frequency shift module is used for multiplying M to-be-integrated sub band baseband complex signals by a complex exponential modulation factor, and a signal spectrum distribution mode with the same bandwidth and central frequencies arranged at an equal interval is obtained; modulation data of M channels are subjected to a Fourier transform module, IDFT (Inverse Discrete Fourier Transform) is carried out on M sub channels, and data after transform are obtained; the data after IDFT are filtered, D-times interpolation is carried out, and data after M sub channel interpolation are obtained; and through a delay module and a summation module, a final target signal is obtained in an integrated mode. Better stop-band attenuation can be obtained, and the calculation amount and the hardware resource loss are reduced.

Description

technical field [0001] The invention belongs to the application field of software radio, and specifically relates to a DFT-based non-maximum decimation system synthesis filter bank construction method in a wide-band digital transceiver system, a voice signal processing system and a multi-carrier communication system. Background technique [0002] With the rapid development of software radio systems, communication systems, video signal analysis, voice signal analysis, image signal processing, radar signal processing and other fields, digital signal processing technology has attracted more and more attention. Digital signal processing is the basis of electronic warfare and communication, and electronic warfare and communication are the two major battlefields of modern information technology warfare. Many technologies in electronic warfare are also applicable in the field of communication. As one of the key technologies of digital signal processing, filter bank technology has b...

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Problems solved by technology

[0003] In terms of integrated filter structure design, the patent "A Method for Constructing a Lattice Structured Integrated Filter Bank" (Application No.: 2010100290218) adopts a lattice structure to construct an integrated filter bank, which is used in the field of image denoising, and is consistent with the present invention The structure design is different; the document "Optimized Design of Integrated Filter Bank and Its Application in Image Processing" (Doctoral Thesis of Wuhan University of Science and Technology, 2014) mainly discusses the optimal design of one-dimensional and two-dimensional integrated filter bank in image processing. Research, what all adopted is lattice structure, is different with the structural design of the present invention; Document " HDTV audio frequency decoding comprehensive filter bank algorithm optimization and FPGA realization " (electronic measurement technology, 2008) mainly around the comprehensive filter bank in audio processing The FPGA realization problem research of butterfly structure, does not provide the concrete construction method of synthetic filter bank, is different with the content of the present invention; Document " research on the symmetry and length selection method of synthetic filter based on M channel LPPRFB " (Journal of Instrument and Apparatus , 2009) mainly focused on the research on the symmetry and length selection method of the integrated filter, and did not involve the construction method of the integrated filter bank, which is different from the patent of the present invention

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