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    • 1. 发明授权
    • Fast fourier transform (FFT) architecture in a multi-mode wireless processing system
    • 快速傅立叶变换(FFT)架构在多模式无线处理系统中
    • US07734674B2
    • 2010-06-08
    • US11199577
    • 2005-08-08
    • Lewis Neal CohenTheodore Jon MyersRobert W. Bosel
    • Lewis Neal CohenTheodore Jon MyersRobert W. Bosel
    • G06F15/00
    • G06F17/142
    • A system and method Fast Fourier Transform (FFT) method in a multi-mode wireless processing system. The method can include loading an input vector into an input buffer, initializing a second counter and a variable N, where N=log2 (input vector size), and s is the value of the second counter, performing an FFT stage, and comparing s to N and performing additional FFT stages until s=N. Performing the FFT stage can include performing vector operations on data in the input buffer and sending results to an output buffer, the data in the input buffer comprising a plurality of segments, advancing the value of the second counter; and switching roles of the input and output buffers. The vector operations can include performing Radix-4 FFT vector operations on the four input data at a time and multiplying the resulting output vectors with a Twiddle factor.
    • 一种多模式无线处理系统中的系统和方法快速傅里叶变换(FFT)方法。 该方法可以包括将输入向量加载到输入缓冲器中,初始化第二计数器和变量N,其中N = log2(输入向量大小),s是第二计数器的值,执行FFT阶段,并比较s 到N并执行附加的FFT级直到s = N。 执行FFT阶段可以包括对输入缓冲器中的数据执行矢量操作并将结果发送到输出缓冲器,输入缓冲器中的数据包括多个段,前进第二计数器的值; 以及切换输入和输出缓冲区的角色。 向量操作可以包括一次对四个输入数据执行Radix-4 FFT向量运算,并将所得到的输出向量与Twiddle因子相乘。