Multi-mode configurable FFT processor and method supporting DAB and CDR

Abstract

The invention discloses a multi-mode configurable FFT (Fast Fourier Transform) processor and method supporting DAB (Digital Audio Broadcasting) and CDR (Code Division Register). The FFT processor comprises a top layer control module, an address generation module and a configurable operational circuit module. The configurable operation circuit module comprises a butterfly operation unit, an input control module, a twiddle factor generation unit and a twiddle factor multiplication unit. The configuration information received by the FFT processor is analyzed by the top layer control unit to obtain a working mode, an operation point number and a butterfly operation layer number; and performing configurable reconstruction on the butterfly arithmetic unit by using the working mode. Arbitrary configuration and operation of different operation points under two standard different modes of DAB and CDR are carried out by reconstructing a butterfly operation structure; the FFT processor is compatible with two standards of DAB and CDR and can quickly reconstruct processing units with different operation functions, the operation efficiency is improved, the resource consumption is reduced, and the circuit area is reduced.

Description

technical field [0001] The invention relates to the technical field of digital multimedia broadcasting, in particular to a multi-mode configurable FFT processor and method supporting DAB and CDR. Background technique [0002] With the continuous development of information communication technology in the direction of digitalization and networking, my country's broadcasting industry has entered a digital development process, gradually shifting from traditional analog FM broadcasting to digital audio broadcasting. At present, the mainstream standards of domestic digital audio broadcasting include digital audio broadcasting (DAB) and China digital broadcasting (CDR). DAB is an all-digital system, suitable for application scenarios with many services and large amounts of data, but the DAB is easy to interfere with the analog broadcast frequency band, does not support digital-analog simulcast, and equipment replacement costs are expensive; CDR supports digital-analog simulcast, an...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is how the baseband demodulation chip of the digital broadcasting receiver is compatible with the DAB and CDR two standards and can quickly reconfigure the processing units with different computing functions, so as to realize the two standards in different scenarios and different signals. Arbitrary configuration and operation of different points under the standard, and how to improve the operation efficiency, reduce resource consumption and reduce the circuit area, the purpose is to provide a multi-mode configurable FFT processor and method supporting DAB and CDR, to solve the above problems

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