نتایج جستجو برای: شبکه fft
تعداد نتایج: 41640 فیلتر نتایج به سال:
الگوریتم fft قلب محاسباتی سیستمهای مخابراتی ofdm است. لذا هر نوع بهینه سازی روی این واحد تاثیر مستقیم بر عملکرد این سیستمها خواهد داشت. ساختار خط لوله بعلت داشتن میزان گذردهی بالا برای سیستمهای مخابرات سیار بسیار مناسب است. از طرفی ساختار خط لوله انواع مختلفی دارد که انتخاب دقیق یک ساختار با توجه به نوع کاربرد بر عملکرد سیستم تاثیر خواهد داشت. لذا در این رساله پردازنده های خط لوله fft از ابعاد ...
An important procedure in the mathematics of phylogenetic analysis is to associate, to any collection of weighted splits, the metric given by the corresponding linear combination of split metrics. In this note, we study necessary and sufficient conditions for a collection of splits of a given finite set X to give rise to a linearly independent collection of split metrics. In addition, we study ...
A large family of signal processing techniques consist of Fourier-transforming a signal, manipulating the Fourier-transformed data in a simple way, and reversing the transformation. We widely use Fourier frequency analysis in equalization of audio recordings, X-ray crystallography, artefact removal in Neurological signal and image processing, Voice Activity Detection in Brain stem speech evoked...
To process high-rate streaming data, throughput is one of the key performance metrics for FFT design. However, high throughput FFT architectures consume large amount of power due to complex routing or excessive memory access. In this paper, we propose a Cooley-Turkey algorithm based, high throughput energy-efficient multi-FFT architecture. In the proposed architecture, we use multiple time-mult...
DOI: 10.5281/zenodo.55536 ABSTRACT Discrete Fourier Transform is a principal mathematical method for the frequency analysis and has wide applications in Engineering and Sciences. Because the DFT is so ubiquitous, fast methods for computing DFT have been studied extensively, and continuous to be an active research. The way of splitting the DFT gives out various fast algorithms. In this paper, we...
We describe an implementation of the Cooley Tukey complex-to-complex FFT on the Connection Machine. The implementation is designed to make eeective use of the communications bandwidth of the architecture, its memory bandwidth, and storage with precomputed twiddle factors. The peak data motion rate that is achieved for the interprocessor communication stages is in excess of 7 Gbytes/s for a Conn...
The Fast Fourier Transform (FFT) is based on an important factorization of the Fourier matrix Fn into a product of sparse matrices. In this paper, we demonstrate the existence of a set of FFT-like factorizations for an arbitrary Kronecker product of Fourier matrices F = Fn1 ⊗ . . . ⊗ Fnk . We show that there exists such a factorization for any chain of nested subgroups of the Abelian group Zn1×...
© 2010 Sang-In Cho et al. 1 In this paper, we present a fast Fourier transform (FFT) processor with four parallel data paths for multiband orthogonal frequency-division multiplexing ultrawideband systems. The proposed 128-point FFT processor employs both a modified radix-2 algorithm and a radix-2 algorithm to significantly reduce the numbers of complex constant multipliers and complex booth mul...
Fructosyltransferases (FTs) synthesize fructans, fructose polymers accumulating in economically important cool-season grasses and cereals. FTs might be crucial for plant survival under stress conditions in species in which fructans represent the major form of reserve carbohydrate, such as perennial ryegrass (Lolium perenne). Two FT types can be distinguished: those using sucrose (S-type enzymes...
The technique of orthogonal frequency divisionmultiplexing (OFDM) is famous for its robustness against frequency-selective fading channel. This technique has been widely used in many wired and wireless communication systems. In general, the fast Fourier transform (FFT) and inverse FFT (IFFT) operations are used as the modulation/demodulation kernel in the OFDM systems, and the sizes of FFT/IFFT...
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