VLSI Design and Implementation of Reconfigurable 46-Mode Combined-Radix-Based FFT Hardware Architecture for 3GPP-LTE Applications
Abstract: This paper presents a reconfigurable fast Fourier transform (FFT) hardware architecture, supporting 46 different FFT sizes defined in 3GPP-LTE applications. Our proposed design concept is mainly based on combined radix-5, radix-32, and radix24 single-path delay feedback FFT design approaches. In addition, in order to elaborate our hardware design, we also develop three design techniques, such as reconfigurable processing kernel with seven types (RPK-ST), efficient FIFO management scheme, and single-table approximation method. In an ASIC implementation with TSMC 40-nm CMOS technology, our 46-mode reconfigurable FFT chip only occupies a core area of 0.36 mm2, dissipates 48.46 mW, and operates up to clock frequency of 500 MHz. As compared with the other state-of-the-art works, our work delivers high-quality design results in the aspects of area- and energy-related performance indexes, providing a constructive FFT design prototyping for 3GPP-LTE systems.
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