802.11a and 802.16a OFDM FFT Core

Overview

Key Features

• The FFT Core implements a 64-point or 256-point FFT and inverse FFT suitable for use in the Demodulator or Modulator of OFDM (COFDM) systems such as 802.11a and 802.16a.
• It uses a fast and efficient radix-4 engine to compute the FFT. All logic is fully pipelined to clock at 4x sample rate.
• Synthesis control for 64-point FFT, 256-point FFT or other sizes = 22n
• Synthesis control of signal precision (variable width)
• Performs forward and inverse FFT (IFFT)
• Incorporates unit-delay input buffer which may be used for symbol timing
• Inputs are gathered in time-order at sample rate
• Outputs are produced in a burst at clock rate (3x or 4x sample rate)
• Outputs are produced in scrambled order

Technical Specifications