Low-Power Twiddle Factor Unit for FFT Computation

Provided by: Springer Healthcare
Topic: Storage
Format: PDF
Fast Fourier Transform (FFT) has gained popularity lately due to the fact that OFDM has been used in several wireless and wireline communication systems, e.g., IEEE 802.11a/g, 802.16, VDSL, and DVB. An integral part of the FFT computation are the twiddle factors, which, in software implementations, are typically stored into RAM memory implying large memory footprint. An integral part of FFT computation are the twiddle factors, which, in software implementations, are typically stored into RAM memory implying large memory footprint and power consumption. In this paper, the authors propose a novel twiddle factor generator based on reduced ROM tables.

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