Results 1 to 10 of about 112,080 (220)
Fast DCT-I, DCT-III, and DCT-IV via Moments [PDF]
EURASIP Journal on Advances in Signal Processing, 2005 Summary: This paper presents a novel approach to compute DCT-I, DCT-III, and DCT-IV. By using a modular mapping and truncating, DCTs are approximated by linear sums of discrete moments computed fast only through additions. This enables us to use computational techniques developed for computing moments to compute DCTs efficiently. We demonstrate this by
G. Y. Wang, Y. Z. Liu, J. G. Liu
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Maximum likelihood based estimation of frequency and phase offset in DCT OFDM systems under non-circular transmissions: algorithms, analysis and comparisons [PDF]
, 2008 Recently, the advantages of the discrete cosine transform (DCT) based orthogonal frequency-division multiplexing (OFDM) have come to the light. We thus consider DCT- OFDM with non-circular transmission (our results cover circular transmission as well ...
Cui, Tao +3 more
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DCT-Based Iris Recognition [PDF]
IEEE Transactions on Pattern Analysis and Machine Intelligence, 2007 This paper presents a novel iris coding method based on differences of discrete cosine transform (DCT) coefficients of overlapped angular patches from normalized iris images. The feature extraction capabilities of the DCT are optimized on the two largest publicly available iris image data sets, 2,156 images of 308 eyes from the CASIA database and 2,955
Donald M, Monro +2 more
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DCT-based motion estimation [PDF]
IEEE Transactions on Image Processing, 1998 We propose novel discrete cosine transform (DCT) pseudophase techniques to estimate shift/delay between two one-dimensional(1-D) signals directly from their DCT coefficients by computing the pseudophase shift hidden in DCT and then employing the sinusoidal orthogonal principles, applicable to signal delay estimation remote sensing.
U V, Koc, K R, Liu
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Feedforward data-aided phase noise estimation from a DCT basis expansion [PDF]
, 2008 This contribution deals with phase noise estimation from pilot symbols. The phase noise process is approximated by an expansion of discrete cosine transform (DCT) basis functions containing only a few terms.
Bhatti, Jabran, Moeneclaey, Marc
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Recovering Missing Coefficients in DCT-Transformed Images [PDF]
, 2011 A general method for recovering missing DCT coefficients in DCT-transformed images is presented in this work. We model the DCT coefficients recovery problem as an optimization problem and recover all missing DCT coefficients via linear programming.
Karrenbauer, Andreas +3 more
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Performance analysis and optimization of DCT-based multicarrier system on frequency-selective fading channels [PDF]
, 2018 Regarded as one of the most promising transmission techniques for future wireless communications, the discrete cosine transform (DCT) based multicarrier modulation (MCM) system employs cosine basis as orthogonal functions for real-modulated symbols ...
Cao, Aijun +5 more
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DCT-OFDM With Index Modulation [PDF]
IEEE Communications Letters, 2017 In this letter, index modulation (IM) is proposed for OFDM systems based on a discrete cosine transform (DCT) implementation. The new DCT-OFDM-IM scheme is shown to yield spectral efficiency improvements of up to 38% relative to OFDM-IM and up to 55% relative to OFDM while occupying the same bandwidth and maintaining similar robustness against the ...
Chafii, Marwa +2 more
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Pilot-aided carrier synchronization using an approximate DCT-based phase noise model [PDF]
, 2007 This contribution deals with phase noise estimation from pilot symbols. The phase noise process is approximated by an expansion of DCT basis functions containing only a few terms.
Bhatti, Jabran, Moeneclaey, Marc
core +2 more sources
Steerable Discrete Cosine Transform [PDF]
, 2017 In image compression, classical block-based separable transforms tend to be inefficient when image blocks contain arbitrarily shaped discontinuities. For this reason, transforms incorporating directional information are an appealing alternative.
Fosson, Sophie Marie +2 more
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