نتایج جستجو برای: zero padding

تعداد نتایج: 150601  

2005
Nahoko Hayashi Takayuki Arai Nao Hodoshima Kiyohiro Kurisu

To improve speech intelligibility in reverberant environments, Arai et al. proposed the methods of “steady-state suppression” (Arai, 2002) and “steady-state zero-padding” (Arai, 2005) as a pre-processing method. We conducted two perceptual experiments to evaluate and compare these methods in a hall with an electrical reverberator. The advantage of using this electrical reverberator is that the ...

2006
Yuhang Wang

Array-based comparative genome hybridization (array CGH) is a recently developed high-throughput technique to detect DNA copy number aberrations. Typically, array CGH data is noisy. Wavelet denoising was previously shown to have superior performance for denoising array CGH data. However, the effect of different signal extensions methods on the performance of wavelet denoising in this particular...

Journal: :EURASIP J. Wireless Comm. and Networking 2009
Vincent Le Nir Toon van Waterschoot Marc Moonen Jonathan Duplicy

Abstract— A cognitive radio system needs accurate knowledge of the radio spectrum it operates in. Blind modulation recognition techniques have been proposed to discriminate between single-carrier and multicarrier modulations and to estimate their parameters. Some powerful techniques use autocorrelation and cyclic autocorrelation based features of the transmitted signal applying to OFDM signals ...

Journal: :Systems & Control Letters 2002
Jonathan H. Manton

Orthogonal frequency division multiplex (OFDM) systems are particularly straightforward to understand in the frequency domain. The purpose of this paper is to draw attention to the fact that zero padded block transmissions also have a straightforward frequency domain interpretation. The advantages of this interpretation are illustrated by three additional results which further the understanding...

Journal: :SIAM J. Scientific Computing 2011
John C. Bowman Malcolm Roberts

Algorithms are developed for calculating dealiased linear convolution sums without the expense of conventional zero-padding or phase-shift techniques. For one-dimensional in-place convolutions, the memory requirements are identical with the zero-padding technique, with the important distinction that the additional work memory need not be contiguous with the input data. This decoupling of data a...

2013
Padmapriya Praveenkumar Rengarajan Amirtharajan

Broadband application of wireless communication calls for good signal to noise ratio (SNR) and variable high data rates. In the midst of a spate of available techniques, Orthogonal Frequency Division Multiplexing (OFDM) has proven to be effective. OFDM systems have high tolerance towards multipath effects in fading channels. Wireless communication will become tortuous in the presence of Inter S...

2007
Heidi Steendam Marc Moeneclaey

In this paper, we consider different types of guard intervals for OFDM systems, i.e. cyclic prefix (CP), zero padding (ZP) and known symbol padding (KSP). We compare the different OFDM systems with respect to their SNR performance. We show that CP-OFDM and ZP-OFDM have exactly the same performance, whereas KSP-OFDM has a slightly worse performance. Further, we consider data aided channel estima...

2015
Malcolm Roberts John C. Bowman

Implicitly dealiasing is a recently-developed technique which improves upon conventional zero padding to compute linear convolutions via fast Fourier transforms. For onedimensional inputs, the memory requirements and performance are similar to conventional zero-padded convolutions, but implicitly dealiased convolutions are faster and require less memory when the data is multi-dimensional. We sh...

Journal: :IEEE Trans. Communications 2002
Bertrand Muquet Zhengdao Wang Georgios B. Giannakis Marc de Courville Pierre Duhamel

Zero padding (ZP) of multicarrier transmissions has recently been proposed as an appealing alternative to the traditional cyclic prefix (CP) orthogonal frequency-division multiplexing (OFDM) to ensure symbol recovery regardless of the channel zero locations. In this paper, both systems are studied to delineate their relative merits in wireless systems where channel knowledge is not available at...

Journal: :EURASIP J. Adv. Sig. Proc. 2004
Neng Wang Steven D. Blostein

We present a novel bandwidth (BW) efficient orthogonal frequency division multiplexing (OFDM) scheme with adaptive zeropadding (AZP-OFDM) for wireless transmission. Redundancy issues in OFDM based on cyclic prefix (CP), zero-padding (ZP), as well as no guard interval (NGI) systems are analyzed. A novel system design criterion based on the channel matrix condition is studied and applied to the d...

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