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Data amount-variable radix-4 module for fast Fourier transform (FFT)/inverse fast Fourier transform (IFFT) processor

A processor and data technology, applied in the base 4 module field, can solve the problems of large register data and occupying large chip resources, etc.

Inactive Publication Date: 2011-11-09
SHANGHAI HUAHONG INTEGRATED CIRCUIT
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Based on the content of the invention patent titled "FFT / IFFT Processor Radix-4 Module for Realizing Variable Number of Data" (Application No. 200910201955.2), the design uses a lot of register data, which takes up A large number of chip resources, how to reduce the chip area and improve the resource utilization rate of the chip design without changing the original clock frequency design on the basis of the existing technology has become a technical problem to be solved by the present invention

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  • Data amount-variable radix-4 module for fast Fourier transform (FFT)/inverse fast Fourier transform (IFFT) processor
  • Data amount-variable radix-4 module for fast Fourier transform (FFT)/inverse fast Fourier transform (IFFT) processor
  • Data amount-variable radix-4 module for fast Fourier transform (FFT)/inverse fast Fourier transform (IFFT) processor

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[0025] specific implementation plan

[0026] Below in conjunction with each accompanying drawing, the content that the present invention proposes is described in detail:

[0027] Such as figure 1 As shown in , if the clock of the input data is clk1x, the clock of the three registers of the radix-4 module and the clock of the related control logic circuit must use twice the clock clk2x, so as to ensure that when the next data block arrives, the registers are read first and then Write operations will not cause data to be overwritten or lost.

[0028] The following takes the radix-4 operation of a data block with a data number N of 4096 and a bit width of 10 bits as an example for a detailed description:

[0029] The external input data block has a total of 4096 data, divided into four blocks, the first block is the 1st to 1024th data; the second block is the 1025th to 2048th data; the third block is the 2049th to 3072th data; the fourth The block is the 3073rd to 4096th data,...

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Abstract

The invention discloses a data amount-variable radix-4 module for a fast Fourier transform (FFT) / inverse fast Fourier transform (IFFT) processor. The radix-4 module consists of registers, a radix-4 arithmetic unit, an alternative multi-path selector, a selection and control module, a multiplication module and a rotation factor module. The alternative multi-path selector comprises two multi-path selectors MUX1 and MUX2. When input, external data is divided into four data blocks, the data of the first three blocks is stored in the registers, and when arriving, the data of the last block is transmitted together with the data of the first three blocks in the registers to the radix-4 arithmetic unit for an operation. By the data amount-variable radix-4 module for the FFT / IFFT processor, a plurality of registers can be combined on the premise of not changing conventional clock frequency so as to reduce register connecting lines and a designing area, save chip resources and increase the utilization rate of resources.

Description

technical field [0001] The invention relates to a radix-4 module based on an FFT / IFFT processor, in particular to a radix-4 module of an FFT / IFFT processor with variable data numbers. Background technique [0002] With the development of communication technology and signal processing technology, people have more and more demands for multimedia, and the quality is getting higher and higher. How to realize reasonable optimization of real-time multimedia communication terminal equipment and products under the existing technical level and hardware conditions It has always been a topic of concern in the field of signal processing and related companies in recent years. [0003] As an important direction for the development of multimedia communication and integrated circuit industry, mobile digital TV has achieved rapid development in the world in recent years. As a leader in digital TV standards, CMMB (China Mobile Multimedia Digital Broadcasting) standard has covered most large ...

Claims

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Application Information

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IPC IPC(8): H04N5/44
Inventor 左耀华
Owner SHANGHAI HUAHONG INTEGRATED CIRCUIT
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