3780-point quick fourier transformation processor of pipelining structure

A technology of Fourier transform and pipeline, which is applied in the field of digital signal processing and digital communication, can solve the problems of complex address conversion, error and introduction of intermediate data, and achieve the effect of avoiding address mapping, improving processing speed and avoiding complexity

Inactive Publication Date: 2008-03-05
FUDAN UNIV +1
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Problems solved by technology

In method 1, interpolating 3780 points to 4096 points reduces the complexity of hardware implementation, but at the same time introduces errors and reduces calculation accuracy, so this method is generally not used in actual implementations
In method 2, due to the mixed base algorithm, the address translation of the intermediate data is quite complicated, so it is not suitable to adopt a full pipeline structure, which limits the data throughput rate of the processor

Method used

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  • 3780-point quick fourier transformation processor of pipelining structure
  • 3780-point quick fourier transformation processor of pipelining structure
  • 3780-point quick fourier transformation processor of pipelining structure

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Embodiment Construction

[0058] Please refer to Figure 1, taking a group of 3780 point inputs as a cycle, and explain its operation steps:

[0059] (1) The FFT / IFFT control unit 101 controls the whole process to perform FFT operation or IFFT operation according to the input signal;

[0060] (2) In the first cycle, after the data is input to the conjugate unit 103, the input data is stored in the upper 3780 bits of the first "ping-pong" structure storage unit 104 by the read-write address and the control state machine 102;

[0061] (3) In the second cycle, the read-write address and the control state machine 102 control the input data to be stored in the low 3780 bits of the first "ping-pong" structure storage unit 104, while the first "ping-pong" structure storage unit 104 high The 3780-point input of the last cycle of the 3780-bit storage is input to the 63-point FFT calculation unit 106 through the selector 105, and the 63-point FFT is calculated;

[0062] (4) The twiddle factor storage ROM107 outp...

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Abstract

3780 points Fast Fourier Transform (FFT) processor is based on pipeline architecture. Based on mixed base algorithm, the invention decomposes 3780 points FFT into 63X60. Based on prime factor algorithm, 63 points FFT and 60 points FFT are decomposed to 7X9 and 5X3X4 respectively. Characters are that the state design based on pipeline is adopted by each FFT arithmetic unit, and memory unit of using 'ping-pong' structure is in use for storing arithmetic data so as to constitute 3780 points FFT processor in complete pipeline architecture. Thus, the input data can be carried out FFT operation uninterruptedly, and operational result can be output uninterruptedly. The invention raises data throughput of processor, and reduces complexity for controlling address of reading and writing memory.

Description

technical field [0001] The invention belongs to the technical field of digital signal processing and digital communication, and in particular relates to a fast Fourier transform (FFT) processor based on a pipeline structure. Background technique [0002] The national standard digital TV terrestrial transmission scheme uses time-domain synchronous orthogonal frequency division multiplexing (TDS-OFDM) to modulate and demodulate the signal, that is, the inverse discrete Fourier transform (IDFT) is used at the sending end to transform the frequency domain The modulated data is converted into a time-domain signal and sent out, and the received time-domain signal is converted into a frequency-domain signal by discrete Fourier transform (DFT) at the receiving end, and then judged and demodulated to restore the modulated information in the frequency domain. It can be seen that DFT / IDFT occupies a large amount of computing time and computing resources of the TDS-OFDM system, thus det...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26G06F17/14
Inventor 曾晓洋陈赟林一帆肖昊许光铭
Owner FUDAN UNIV
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