High-precision and low-power-consumption FFT (fast Fourier transform) processor
A processor and generator technology applied in the field of FFT processors to achieve the effects of small area, flexible configuration, and low power consumption
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[0016] Improved block floating point techniques such as figure 2 As shown, taking the 64-point FFT operation as an example, after the first stage operation, the subsequent calculation can be divided into four independent parts, each part adopts an independent scaling factor, and its value is determined by the largest data in this part Decide. There are four scaling factors in the entire calculation process, the first scaling factor controls the 0-15 points, the second scaling factor controls the 16-31 points, and the third scaling factor controls the 32-47 points, The fourth scaling factor controls points 48-63. Compared with single scaling, this improved method has higher precision; compared with floating-point calculations, this fixed-point-based scaling mechanism has less hardware overhead, requiring only a few comparators and registers.
[0017] In the DSP system, the quantization error caused by the finite word length effect is unavoidable. In the FFT operation, the d...
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