在分析研究FPGA的可并行运算性质及快速高效地进行二维快速傅里叶变换的计算过程的基础上,实现了FPGA支持的32位多并行2DFFT处理器的设计与仿真研究.设计利用Quartus II 13.0进行分析、布线与综合,利用Modelsim SE仿真平台进行仿真测试...在分析研究FPGA的可并行运算性质及快速高效地进行二维快速傅里叶变换的计算过程的基础上,实现了FPGA支持的32位多并行2DFFT处理器的设计与仿真研究.设计利用Quartus II 13.0进行分析、布线与综合,利用Modelsim SE仿真平台进行仿真测试,并将结果与MATLAB计算结果进行对比验证.结果表明:该处理器充分利用FPGA的并行性和处理能力,解决了普通2DFFT处理器的计算缓慢问题,同时具有运算速度快,结构简易且可重构性能佳等特点.展开更多
We present a novel method to implement the radix-2 fast Fourier transform (FFT) algorithm on field programmable gate arrays (FPGA).The FFT architecture exploits parallelism by having more pipelined units in the stages...We present a novel method to implement the radix-2 fast Fourier transform (FFT) algorithm on field programmable gate arrays (FPGA).The FFT architecture exploits parallelism by having more pipelined units in the stages,and more parallel units within a stage.It has the noticeable advantages of high speed and more efficient resource utilization by employing four ganged butterfly engines (GBEs),and can be well matched to the placement of the resources on the FPGA.We adopt the decimation-infrequency (DIF) radix-2 FFT algorithm and implement the FFT processor on a state-of-the-art FPGA.Experimental results show that the processor can compute 1024-point complex radix-2 FFT in about 11 μs with a clock frequency of 200 MHz.展开更多
In this paper,we address the frequency estimator for 2-dimensional(2-D)complex sinusoids in the presence of white Gaussian noise.With the use of the sinc function model of the discrete Fourier transform(DFT)coefficien...In this paper,we address the frequency estimator for 2-dimensional(2-D)complex sinusoids in the presence of white Gaussian noise.With the use of the sinc function model of the discrete Fourier transform(DFT)coefficients on the input data,a fast and accurate frequency estimator is devised,where only the DFT coefficient with the highest magnitude and its four neighbors are required.Variance analysis is also included to investigate the accuracy of the proposed algorithm.Simulation results are conducted to demonstrate the superiority of the developed scheme,in terms of the estimation performance and computational complexity.展开更多
在毫米波连续波阵列雷达系统中,根据近场各动目标多普勒频率的不同,提出了一种近场动目标多普勒频率、距离及方位三维参数估计算法。首先采用全相位快速傅里叶变换(all phase fast Fourier transform,apFFT)方法估计回波信号频谱,并使...在毫米波连续波阵列雷达系统中,根据近场各动目标多普勒频率的不同,提出了一种近场动目标多普勒频率、距离及方位三维参数估计算法。首先采用全相位快速傅里叶变换(all phase fast Fourier transform,apFFT)方法估计回波信号频谱,并使用相位差频谱校正法对目标多普勒频率进行校正。全相位FFT方法所得相位谱为信号的初始相位,各通道之间对应信号的相位关系包含了目标的位置信息,采用二维多重信号分类(twodimensional multiple signal classification,2-D MUSIC)方法就可从各目标对应多普勒频率的复幅度中估计出目标的距离及方位参数。计算机仿真结果证明了该算法的有效性。展开更多
文摘在分析研究FPGA的可并行运算性质及快速高效地进行二维快速傅里叶变换的计算过程的基础上,实现了FPGA支持的32位多并行2DFFT处理器的设计与仿真研究.设计利用Quartus II 13.0进行分析、布线与综合,利用Modelsim SE仿真平台进行仿真测试,并将结果与MATLAB计算结果进行对比验证.结果表明:该处理器充分利用FPGA的并行性和处理能力,解决了普通2DFFT处理器的计算缓慢问题,同时具有运算速度快,结构简易且可重构性能佳等特点.
文摘We present a novel method to implement the radix-2 fast Fourier transform (FFT) algorithm on field programmable gate arrays (FPGA).The FFT architecture exploits parallelism by having more pipelined units in the stages,and more parallel units within a stage.It has the noticeable advantages of high speed and more efficient resource utilization by employing four ganged butterfly engines (GBEs),and can be well matched to the placement of the resources on the FPGA.We adopt the decimation-infrequency (DIF) radix-2 FFT algorithm and implement the FFT processor on a state-of-the-art FPGA.Experimental results show that the processor can compute 1024-point complex radix-2 FFT in about 11 μs with a clock frequency of 200 MHz.
文摘In this paper,we address the frequency estimator for 2-dimensional(2-D)complex sinusoids in the presence of white Gaussian noise.With the use of the sinc function model of the discrete Fourier transform(DFT)coefficients on the input data,a fast and accurate frequency estimator is devised,where only the DFT coefficient with the highest magnitude and its four neighbors are required.Variance analysis is also included to investigate the accuracy of the proposed algorithm.Simulation results are conducted to demonstrate the superiority of the developed scheme,in terms of the estimation performance and computational complexity.
文摘在毫米波连续波阵列雷达系统中,根据近场各动目标多普勒频率的不同,提出了一种近场动目标多普勒频率、距离及方位三维参数估计算法。首先采用全相位快速傅里叶变换(all phase fast Fourier transform,apFFT)方法估计回波信号频谱,并使用相位差频谱校正法对目标多普勒频率进行校正。全相位FFT方法所得相位谱为信号的初始相位,各通道之间对应信号的相位关系包含了目标的位置信息,采用二维多重信号分类(twodimensional multiple signal classification,2-D MUSIC)方法就可从各目标对应多普勒频率的复幅度中估计出目标的距离及方位参数。计算机仿真结果证明了该算法的有效性。
