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802.11n based FFT/IFFT (fast fourier transform)/(inverse fast fourier transform) processor

A technology of processor and selector, which is applied in the field of OFDM system and signal processing in communication technology, can solve the problems that the bit width cannot be arbitrarily configured, the overall performance is not high, and the versatility is not strong, so as to save resources, less resources, The effect of enhancing configurability

Inactive Publication Date: 2011-05-18
INST OF MICROELECTRONICS CHINESE ACAD OF SCI
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Problems solved by technology

Literature [2] adopts a parallel structure, which consumes a lot of resources, and the bit width cannot be configured arbitrarily, and the precision is not high
Documents [3][4][5] are all designed for specific requirements, the versatility is not strong, and the overall performance is not high

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  • 802.11n based FFT/IFFT (fast fourier transform)/(inverse fast fourier transform) processor
  • 802.11n based FFT/IFFT (fast fourier transform)/(inverse fast fourier transform) processor
  • 802.11n based FFT/IFFT (fast fourier transform)/(inverse fast fourier transform) processor

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Embodiment Construction

[0035] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0036] The FFT / IFFT processor provided by the present invention adopts a single butterfly 4-way parallel processing, which can realize FFT / IFFT transformation of 64 points and 128 points, and the bit width can be configured arbitrarily according to the system requirements. The test results show the correctness of the design. The speed and throughput meet the requirements of 802.11n system. The operation unit adopts an improved radix-4 butterfly structure, which realizes radix-4 and radix-2 mixed radix operations by time-division multiplexing. Compared with the traditional 4-way parallel method, it requires less hardware resources. The block floating-point algorithm is adopted to improve the precision of data operation. T...

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Abstract

The invention discloses an 802.11n based FFT / IFFT (Fast Fourier Transformation) / (Inverse Fast Fourier Transformation) processor, comprising a RAM (Random Access Memory), an address generating module, a sequence adjusting module, a shift control module, an exponent generating module and a butterfly operation unit, wherein the processor adopts a RAM in a double ping-pang structure and is used for realizing caching of data stream; the address generating module is used for generating an address used for writing data into the RAM and reading data from the RAM; the sequence adjusting module is used for selecting the data in the RAM and adjusting the sequence; the shift control module shares an exponent at each level; the exponent generating module is used for generating a maximum exponent after operation at each level according to the calculated result of the butterfly operation unit; and the butterfly operational unit adopts a block floating point algorithm to complete radix-4 or radix-2 operation. By utilizing the invention, FFT arithmetic and IFFT arithmetic can be conveniently carried out, thus solving the problems that the traditional FFT / IFFT processor has abundant resource, accuracy is low and operation time is too long.

Description

technical field [0001] The present invention relates to the field of OFDM system and signal processing technology in communication technology, in particular to an 802.11n-based FFT / IFFT processor suitable for an Orthogonal Frequency Division Multiplexing (OFDM) system in the field of wireless communication. Background technique [0002] As a new wireless network protocol, 802.11n has a qualitative leap in terms of transmission speed, coverage and compatibility compared with previous related standards. 802.11n comprehensively adopts advanced technologies such as Orthogonal Frequency Division Multiplexing (OFDM) modulation and Multiple Input Multiple Output (MIMO), which increases the transmission speed of the wireless network to 100Mb / s~600Mb / s, and the transmission distance can reach several kilometers; The unique dual-band working mode (including two working frequency bands of 2.4GHz and 5GHz) ensures compatibility with previous standards such as 802.11a / b / g. [0003] FFT / ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/14
Inventor 吴斌姜鑫尉志伟周玉梅
Owner INST OF MICROELECTRONICS CHINESE ACAD OF SCI
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