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Multi-beam 8×8 RF aperture digital beamformers using multiplierless 2-D FFT approximations

机译:使用多平台2-D FFT近似的多光束8×8射频光圈形成器

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The two-dimensional (2-D) discrete Fourier transform (DFT) is widely used in digital signal processing (DSP) and computing applications. Fast Fourier transforms (FFTs) are widely used as low-complexity algorithms for the computation of the DFT as it reduces the required computation operations from O(N) to O(N logN). The multiplicative complexity is used as a benchmark in comparing different algorithms as it affects the circuit complexity, chip area and power. This paper introduces a new class of multiplierless hardware algorithm consisting only of arithmetic adder circuits that closely approximates the 2-D version of the 8-point DFT. The paper discusses the theory behind the proposed new algorithm, with the DFT presented in the form of an 8 × 8 matrix. Furthermore it provide a multi-beam RF aperture application example where the 2-D DFT approximation has been used to closely obtain the antenna array patterns.
机译:二维(2-D)离散傅里叶变换(DFT)广泛用于数字信号处理(DSP)和计算应用中。快速傅里叶变换(FFT)被广泛用作低复杂性算法,用于计算DFT,因为它将所需的计算操作从O(n)到O(n logn)减少。乘法复杂性用作比较不同算法的基准,因为它影响电路复杂性,芯片区域和电源。本文介绍了一类新的多平台硬件算法,这些算法仅由算术加法器电路组成,该算法电路与8点DFT的2-D版本密切相关。本文讨论了所提出的新算法背后的理论,DFT以8×8矩阵的形式呈现。此外,它提供了一种多光束RF孔径应用示例,其中二维DFT近似用于紧密地获得天线阵列图案。

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