Discrete Fourier transform processing device and method in data rights management (DRM) system
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A processing device and variable technology, applied in the field of digital sound broadcasting, can solve the problems of increasing hardware cost, multi-memory resources, reducing operation speed, etc.
Inactive Publication Date: 2012-07-25
COMMUNICATION UNIVERSITY OF CHINA +2
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As we all know, reordering means that a first-level buffer must be added, which consumes more memory resources and increases hardware costs.
In addition, reordering will reduce the operation speed and increase the complexity of control
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[0019] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but not as a limitation of the present invention.
[0020] The Digital Radio Mondiale (DRM) standard adopts OFDM technology, supports four strong modes of A, B, C, and D and six channel bandwidths of 4.5kHz, 5kHz, 9kHz, 10kHz, 18kHz, and 20kHz, and requires 112, 128, 144, 176, 224, 256, 288, 352, 512, 576 points Ten kinds of discrete Fourier transform (Discrete Fourier Transform, DFT), such as figure 1 shown. Since three kinds of DFTs of powers of 2 and 7 kinds of DFTs of non-powers of 2 are involved, the efficient implementation of DFT in the DRM system is a technical difficulty.
[0021] The DFT of the N-point sequence x(n) is
[0022] X ( k ) = Σ n = 0 N - ...
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Abstract
The invention provides a solution for solving ten DFTs (discrete Fourier transform) with different points in a DRM system, wherein the DFT processor is composed of a controller, an address generator, a first memory, a second memory, a re-ordering unit, a small point WFTA (Winograd Fourier transform algorithm) unit and a variable point base 2FFT (fast Fourier transform algorithm) unit; the DFT operation with points N of 112, 128, 144, 176, 224, 256, 288, 352, 512 and 576 can be finished. The DFT processor repeatedly adopts the small point WFTA unit and base 2FFT unit, reduces re-ordering process, adopts memory resource share mechanism, and does not need rotation factor multiplying, so that the processor is easy to achieve FPGA (field programmable gate array). The requirement of the memory and the logical resource can be reduced effectively when the processing speed is ensured, thus, the aim for reducing hardware cost and power consumption can be achieved.
Description
technical field [0001] The present invention relates to a digital sound broadcasting (Digital Radio Mondiale, DRM) technology, in particular to a method for realizing a ten-point discrete Fourier Transform (DFT) in a DRM system. Background technique [0002] With the continuous growth of wireless communication services, available spectrum resources are increasingly tight. In order to improve spectrum utilization and communication quality, modern wireless communication systems widely adopt Orthogonal Frequency Duplex Multiplexing (OFDM) technology, which has strong immunity to frequency selective fading. The core of OFDM technology is DFT. [0003] The Digital Radio Mondiale (DRM) standard adopts OFDM technology, supports four strong modes of A, B, C, and D and six channel bandwidths of 4.5kHz, 5kHz, 9kHz, 10kHz, 18kHz, and 20kHz, and requires 112, 128, 144, 176, 224, 256, 288, 352, 512, 576 points ten kinds of DFT, such as figure 1 shown. Since three kinds of DFTs of pow...
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