Modern computer architecture provides a special instruction|the fused multiply-add (FMA) instruction|to perform both a multiplication and an addition operation at the same time. In this paper newly developed radix-2, radix-3, and radix-5 FFT kernels that e ciently take advantage of this powerful instruction are presented. If a processor is provided with FMA instructions, the radix-2 FFT algorit...

This paper presents a reconfigurable FFT architecture for variable length and multistreaming WiMax wireless standard. The architecture processes 1 stream of 2048-pt FFT, up to 2 streams of 1024-pt FFT or up to 4 streams of 512-pt FFT. The architecture consists of 11 SDF pipelined stages and radix-2 butterfly is calculated in each stage. The sampling frequency of the system is varied in accordan...

This document describes a FPGA implementation and simulation of the FFT component of the IIP Radiometer RFI processor described in [1]. A possible implementation of this FFT component has been previously described in [2]. Here a single FFT processor will be implemented and tested before proceeding to a larger design consisting of many such processors. This document is broken into three separate...

Waveforms obtained from a superconducting Fault Current Limiter are investigated using the Prony modelling technique. Comparable measurements with the use of standard tools of spectral analysis (like FFT) fail because of short data available and low levels of higher spectral components. Streszczenie. W pracy przedstawiono wyniki analizy widmowej prądów i napięć zarejestrowanych w obwodach z nad...

The presence of harmonics in power system is a major concern to power engineers for many years. With the increasing usage of nonlinear loads in power systems, the harmonic pollution becomes more serious. One of the widely used computation algorithm for harmonic analysis is Fast Fourier Transform (FFT). In this project, a harmonic analyzer using FFT is being implemented on ARM7 core processor LP...

Measuring means extracting information from acquired signals. Either in the frequency or in the time, mathematical processing tools are applied to get information from measurement signals. It is usual, when processing measurement signals in the frequency domain, the application of Fourier analysis, mainly through Fast Fourier Transform (FFT) algorithms. Nevertheless, there are other digital sig...

background: increase in aquatic production is dependent on raw materials, quality of diet, feed manufacture technology and optimum feed formulation. objectives: the aim of this study was investigation and quality control feed of fft, gft1 and gft2 of rainbow trout in farm and fish feed factory producers in chaharmahal and bakhtiari province. methods: in this study samples of fft, gft1 and gft2 ...

Under many research works, it has been observed that the multiple input multiple output (MIMO) system can be considered an efficient solution for the high-speed wireless communication. However, the delay spreads in non-flat fading channels abrupt the functioning of MIMO system. In orthogonal frequency division multiplexing (OFDM), the channel impulse response is flat in each sub carrier. Hence,...

Fast Fourier transforms (FFT) and Inverse Fast Fourier Transform (IFFT) processing is one of the key procedures in popular orthogonal frequency division multiplexing (OFDM) communication systems. This paper presents the study of an efficiency of the fast Fourier transform may be increased by removing operations of input values which are zero, and of output values which are not required; this pr...