OFDM调制中高速FFT处理器的设计与实现

The Design and Implementation High-speed FFT Processor for OFDM Modulation

通过对通用算法对比和分析,介绍了一种利用混合基、多块存储器的原位算法构成、能够实现持续处理的多模式FFT处理器的设计和实现。该FFT处理器采用类似块浮点的数据收缩方法,结构简单、速度高、性能好、功耗低,不仅满足高速计算的要求,而且减小了硬件实现的复杂度、易于FPGA实现,因此可以适用于多载波OFDM调制系统中。

The design and implementation of high-speed FFT processor for OFDM modulation is introduced through comparing and analyzing varieties conventional FFT algorithm. The proposed FFT processor simultaneously performs sequential input and output by applying an in-place algorithm for a mixed-radix multi-bank memory. The FFT processor adopts similar block-floating point data scaling approach and satisfy a high-speed calculation requirement while minimizing its complexity satisfying a high-speed calculation requirement. It suitable for OFDM modulation and easy to be implemented with FPGA with high-speed calculation, less complexity, high-performance and low power.