This paper describes the design and implementation of a fully pipelined 64-point Fast Fourier Transform (FFT) in programmable logic. The FFT takes 20-bit fixed point complex numbers as input and after a known pipeline latency produces 20-bit complex values representing the FFT of the input. It is designed to allow continuous input of samples and is therefore suitable for use in real-time system...

In recent years, as a result of advancing VLSI technology, OFDM has received a great deal of attention and been adopted in many new generation wideband data communication systems such as IEEE 802.11a, HiPerLAN/2,digital audio/video broadcasting (DAB/DVB-T) and asymmetric digital subscriber line (ADSL), very high speed digital subscriber line (VDSL) in wireless and wired communications, respecti...

he Fast Fourier Transform (FFT) algorithm has been used in a variety of applications in signal and image T processing [1-51. In this article, a simple procedure for designing Finite-extent Impulse Response (FIR) discretetime filters using the FFT algorithm is described. The zerophase (or linear phase) FIR filter design problem is formulated here to altemately satisfy the frequency domain constr...

This paper focus on the development of the fast Fourier transform (FFT), based on Decimation-In-Time (DIT) domain by using Mixed-Radix algorithm (Radix-4 and Radix-8).Fast Fourier transforms, popularly known as FFTs, have become an integral part of any type of digital communication system and a wide variety of approaches have been tried in order to optimize the algorithm for a variety of parame...

This paper proposes a class of power-of-two FFT (Fast Fourier Transform) algorithms, called AM-QFT algorithms, that contains the improved QFT (Quick Fourier Transform), an algorithm recently published, as a special case. The main idea is to apply the Amplitude Modulation Double Sideband Suppressed Carrier (AM DSB-SC) to convert odd-indices signals into even-indices signals, and to insert this e...

OrthogonalFrequencyDivisionMultiplexing (OFDM) is a multicarrier modulation technique which divides the available spectrum into many carriers. OFDM uses the spectrumefficiently compared to FDMA by spacing the channels much closer together andmaking all carriers orthogonal toone another[1]. In OFDM applications, IFFT/FFT hardware in the transceiver is usually designed jointly to carry out IFFT a...

Transcranial Doppler ultrasound is capable of detecting microembolic material, both gaseous and solid, within the intracranial cerebral arteries. To avoid discrediting this promising and exciting new technique, experts in this field met in January 1997 in Frankfurt, Germany, to discuss the limitations and problems of embolus detection and to determine guidelines for its proper use in clinical p...