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OFDM technology is used for many communication systems such as Asymmetric Digital Subscriber Line (ADSL), Wireless Local Area Network (WLAN) or multimedia communication services. One of the key components in OFDM system is the Fast Fourier Transform (FFT). There are more and more communication systems requiring higher points FFT and higher symbol rates. The requirement establishes challenges for low power and high speed FFT design with large points. In the authors' target application, the IEEE 802.16d (fixed WiMAX) standard requires the OFDM symbol rates from 1.75 MHz to 20 MHz and the FFT up to 2048 points.
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