四路并行MDF FFT的FPGA实现
基于FPGA的FFT计算架构主要分为四种类型：顺序架构、并行架构、流水架构和阵列架构。流水结构是利用时间并行的计算方法，将重复的计算过程分解为多级进行计算，各级之间以流水的方式在时间上并行计算。
MDF架构是SDF架构的并行版本。最初的MDF架构由多个SDF架构通过变换电路连接而成。一般来说，MDF由多个相互连接的SDF路径组成，每个路径负责管理一个并行输入流。这种设计有助于有效利用寄存器的继承，节省了内存资源。
四路并行基2-DIF MDF FFT的具体架构如图 7所示，可以看到四路并行MDF FFT架构是SDF FFT的并行版本，从单个通道变为了4个通道。在前8个阶段，每个通道都相当于单个SDF在运行，每个通道的数据互不影响，在最后两阶段一起处理四路数据，输出最终结果。
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