FFT processor based on radix-2SDF pipeline type and implementation method of FFT processor in ACO-OFDM system

A pipeline-type, processor-based technology, applied in the field of FFT processor and its realization in ACO-OFDM system, can solve problems such as the lack of realization methods, and achieve the effect of improving efficiency and optimizing realization

Active Publication Date: 2021-02-02
TIANJIN UNIV
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  • Description
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Problems solved by technology

However, most of the current research on ACO-OFDM modulation technology focuses on the analysis and improvement of transmission performance, and the research on specific implementation methods is still relatively lacking.

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  • FFT processor based on radix-2SDF pipeline type and implementation method of FFT processor in ACO-OFDM system
  • FFT processor based on radix-2SDF pipeline type and implementation method of FFT processor in ACO-OFDM system
  • FFT processor based on radix-2SDF pipeline type and implementation method of FFT processor in ACO-OFDM system

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[0032] Certain terms are used, for example, in the description and claims to refer to particular components. Those skilled in the art should understand that hardware manufacturers may use different terms to refer to the same component. The specification and claims do not use the difference in name as a way to distinguish components, but use the difference in function of components as a criterion for distinguishing. As mentioned throughout the specification and claims, "comprising" is an open term, so it should be interpreted as "including but not limited to". "Approximately" means that within an acceptable error range, those skilled in the art can solve the technical problem within a certain error range and basically achieve the technical effect.

[0033] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", horizontal" etc. are based on th...

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Abstract

The invention belongs to the technical field of digital signal processing, and particularly relates to an FFT (fast Fourier transform) processor based on a radix-2SDF pipeline type. The processor comprises four butterfly operation modules connected in series in sequence, twiddle factor storage units are arranged among the butterfly operation modules, and each butterfly operation module comprises abutterfly operation unit used for performing addition and subtraction operations in butterfly operation on input sampling data and data cached at the previous level and generating two operation results, a delay unit used for carrying out delay operation on output data of the butterfly operation unit and realizing delay specified by the system by adopting D trigger cascading, and a control unit used for generating addresses of the twiddle factors at all levels and control signals of the four butterfly operation units, and completing calling of the twiddle factors and gating of internal signalsof the butterfly operation units. Compared with the prior art, the implementation of the ACO-OFDM system is effectively optimized by adopting the radix-2SDF pipelined FFT processor.

Description

technical field [0001] The invention belongs to the technical field of digital signal processing, and in particular relates to a radix-2SDF pipeline-based FFT processor and its implementation method in an ACO-OFDM system. Background technique [0002] With the rapid development of society and the popularization of informatization, wireless networks are continuously providing available capacity and spectrum efficiency. However, due to limited spectrum resources and most of the spectrum has been authorized, wireless frequency bands are becoming more and more Congestion, resulting in a shortage of spectrum resources. In recent years, the emerging visible light communication (Visible Light Communication, VLC) technology has the characteristics of high speed and large bandwidth, and does not require transmission media such as optical fibers, and can directly transmit optical signals in the air, and has become a solution to the danger of spectrum saturation. effective technology....

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/14
CPCG06F17/142
Inventor 冯人海袁万琦王威张琪佳
Owner TIANJIN UNIV
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