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Low-power application-specific FFT processor for LTE applications

In this paper, we describe a processor architecture tailored to mixed-radix4/2/3 FFT algorithm. The proposed design supports all FFT sizes, namely 128-2048/1536, required by the LTE applications. The processor is based on the Transport Triggered Architecture processor architecture, which was customized with a set of function units, designed especially for the application at hand. The processor has been synthesized on an ASIC technology and both energy-efficiency and performance have been evaluated. The developed processor is programmable but shows energy-efficiency comparable to fixed-function ASIC implementations.