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Efficient evolutionary spectral clustering
Pattern Recognition Letters, 2016An 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 +2 more
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On the spatial spectral efficiency of ITLinQ
2014 48th Asilomar Conference on Signals, Systems and Computers, 2014Device-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 +3 more
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Spectral Efficiency of Cognitive Radio Systems
IEEE GLOBECOM 2007-2007 IEEE Global Telecommunications Conference, 2007In 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 +2 more
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Efficient regularized spectral data embedding
Advances in Data Analysis and Classification, 2020zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Lazhar Labiod, Mohamed Nadif
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Comments on spectral efficiency of VMSK
IEEE Transactions on Broadcasting, 2002This 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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On the Energy Efficiency–Spectral Efficiency Tradeoff in Random Beamforming
IEEE Wireless Communications Letters, 2014Energy efficiency (EE) and spectral efficiency (SE) are among the most important metrics in wireless systems. The relationship between EE and SE has attracted more attention recently. In this letter, we derive a closed-form approximation of the EE–SE tradeoff in a multi-antenna random beamforming system under a realistic power consumption model.
Yi Huang, Ling Qiu
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Spectral efficiency of CDMA with random spreading
IEEE Transactions on Information Theory, 1999Summary: The CDMA channel with randomly and independently chosen spreading sequences accurately models the situation where pseudonoise sequences span many symbol periods. Furthermore, its analysis provides a comparison baseline for CDMA channels with deterministic signature waveforms spanning one symbol period. We analyze the spectral efficiency (total
Sergio Verdú, Shlomo Shamai
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Downlink Spectral Efficiency of Mobile WiMAX
2007 IEEE 65th Vehicular Technology Conference - VTC2007-Spring, 2007Mobile WiMAX is an OFDMA (orthogonal frequency division multiple access) mobile broadband air interface defined by the IEEE 802.16 family of standards and promoted by the WiMAX Forum as a solution to the requirements for mobile Internet services.
Roshni Srinivasan +3 more
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Precoded Spectrally Efficient FDM system
21st Annual IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, 2010Spectrally Efficient Frequency Division Multiplexing (SEFDM) system proposes enhanced spectrum utilization in contrast to Orthogonal Frequency Division Multiplexing system (OFDM). Spectral efficiency is increased by relaxing the orthogonality condition while maintaining the same transmission rate per individual channel, hence, for the same bandwidth ...
Safa Isam, Izzat Darwazeh
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Energy-Efficient and Spectrally-Efficient MIMO
2021While enabling energy efficiency and spectral efficiency, MIMO systems tends to be associated to an exponential increase of complexity and of signal processing, with the increase of the number of transmit and receive antennas. As described in this article, a reduction of complexity can be obtained with the use of the two proposed algorithms: Maximum ...
Silva, Mário Marques da +2 more
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