Results 251 to 260 of about 4,625,198 (299)

Efficient evolutionary spectral clustering

Pattern Recognition Letters, 2016
An evolutionary spectral clustering method using a smoothed Laplacian is presented.The incomplete Cholesky decomposition (ICD) reduces runtime from O(N3) to O(N).The memory requirements are decreased from O(N2) to O(N).A stopping criterion using the convergence of cluster assignments is adopted.An efficient procedure to select the number of clusters is
Rocco Langone, Marc Van Barel, Johan A. K. Suykens   +2 more
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Spectrally Efficient Optical Communications

Asia Communications and Photonics Conference 2015, 2015
The paper reviews most diffuse techniques used for increasing spectral efficiency in optical communication, considering different network segments. Time-frequency packing will be described, and compared to Nyquist wavelength-division multiplexing and orthogonal frequency-division multiplexing.
POTI', LUCA, MELONI, GIANLUCA, FRESI, Francesco, MALACARNE, Antonio   +3 more
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The spectral efficiency of linear precoders

Proceedings 2003 IEEE Information Theory Workshop (Cat. No.03EX674), 2004
Recent results on the asymptotic empirical eigenvalue distribution of the sum or product of matrices, based on the free probability theory, have enabled the study of the asymptotic limits of linear precoded OFDM systems with MMSE equalization for ergodic and non-ergodic channels.
Mérouane Debbah, Philippe Loubaton, Marc de Courville   +2 more
openaire   +1 more source

Spectral Efficiency of Multicarrier CDMA

IEEE Transactions on Information Theory, 2005
We analyze the spectral efficiency (sum-rate per subcarrier) of randomly spread synchronous multicarrier code-division multiple access (MC-CDMA) subject to frequency-selective fading in the asymptotic regime of number of users and bandwidth going to infinity with a constant ratio.
TULINO, ANTONIA MARIA, LI L., VERDU S.
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Spectrally efficient noncoherent communication

IEEE Transactions on Information Theory, 2002
Summary: This paper considers noncoherent communication over a frequency-nonselective channel in which the time-varying channel gain is unknown a priori, but is approximately constant over a coherence interval. Unless the coherence interval is large, coherent communication, which requires explicit channel estimation and tracking prior to detection ...
Dilip Warrier, Upamanyu Madhow
openaire   +1 more source

On the spatial spectral efficiency of ITLinQ

2014 48th Asilomar Conference on Signals, Systems and Computers, 2014
Device-to-device (D2D) communication allows serving local wireless traffic bypassing the system's infrastructure. The interference in D2D can be controlled by carefully allocating users to orthogonal channels. This paper analytically characterizes the spectral efficiency of the ITLinQ channelization technique [1].
Ratheesh Kumar Mungara, Xinchen Zhang, Angel E. Lozano, Robert W. Heath Jr.   +3 more
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Spectral Efficiency of Cognitive Radio Systems

IEEE GLOBECOM 2007-2007 IEEE Global Telecommunications Conference, 2007
In this contribution, we investigate the idea of using cognitive radio to reuse locally unused spectrum to increase the total system capacity. We consider a multiband/wideband system in which the primary and cognitive users wish to communicate to different receivers, subject to mutual interference and assume that each user knows only his channel and ...
Majed Haddad, Aawatif Menouni Hayar, Mérouane Debbah   +2 more
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Spectral Efficiency of Multicarrier Schemes for 5G

2019 26th International Conference on Telecommunications (ICT), 2019
This paper compares the spectral efficiency of some of the most popular multicarrier schemes proposed for the fifth generation (5G) of cellular systems, such as orthogonal frequency-division multiplexing (OFDM), filterbank multicarrier (FBMC), generalized frequency-division multiplexing (GFDM), and universal filtered multicarrier (UFMC).
Banelli P., Colavolpe G., Rugini L., Ugolini A.   +3 more
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Comments on spectral efficiency of VMSK

IEEE Transactions on Broadcasting, 2002
This article demonstrates that no ultra narrow band modulation (UNBM) method, which includes very minimum shift keying (VMSK) and VPSK, can have substantially greater efficiency than conventional methods, such as quadrature amplitude modulation (QAM), in transmission in the same frequency band.
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Efficient regularized spectral data embedding

Advances in Data Analysis and Classification, 2020
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Lazhar Labiod, Mohamed Nadif
openaire   +1 more source