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Area Effiecient Algorithm for the Implementation of Configurable FFT/I

Publication Date : 29/06/2015

Author(s) :

Arsha P.S..

Volume/Issue :
Volume 2
Issue 6
(06 - 2015)

Abstract :

The core processing block of an OFDM system are  Fast Fourier Transform (FFT) block and the Inverse Fast Fourier Transform (IFFT) . The FFT/IFFT functions contain twiddle factor term. These complex functions are combination of sine and cosine terms that generally spread in the channel. The commonly used software solutions for the digital implementation of these functions are table lookup method and polynomial expansions, requiring number of multiplications and additions/subtractions. The size of ROM in the multiplier based implementation for the twiddle factors becomes the matter of concern with larger chip area. CORDIC (Coordinate Rotation Digital Computer) is a method for computing elementary functions using minimal hardware such as shifts adds/subs and compares. CORDIC works by rotating the coordinate system through constant angles until the angle is reduces to zero. The angle offsets are selected such that the operations on X and Y are only shifts and adds. The required Rotation for CORDIC is provided by Rotation factor Module. The Radix 4 FFT is chosen since it has fewer calculation than Radix 2. It is simulated and synthesized using Xilinx ISE design..The performance of the coding is analysed from the result of timing simulation using Xilinx ISE Design Suite 14.5 and Modelsim SE 6.5b.

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Area Effiecient Algorithm for the Implementation of Configurable FFT/I

June 29, 2015