Results 211 to 220 of about 653,662 (247)
Some of the next articles are maybe not open access.
Efficient Spectral Methods for PDEs with Spectral Fractional Laplacian
Journal of Scientific Computing, 2021We develop efficient spectral methods for the spectral fractional Laplacian equation and parabolic PDEs with spectral fractional Laplacian on rectangular domains. The key idea is to construct eigenfunctions of discrete Laplacian (also referred to Fourier-like basis) by using the Fourierization method.
Changtao Sheng, Duo Cao, Jie Shen
openaire +1 more source
The spectral efficiency of linear precoders
Proceedings 2003 IEEE Information Theory Workshop (Cat. No.03EX674), 2004Recent 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.
M. de Courville +2 more
openaire +2 more sources
A spectrally efficient CDMA overlay
MILCOM 91 - Conference record, 2002The authors describe a scenario in which a direct-sequence spread-spectrum personal communications network is overlaid on top of an existing set of narrowband microwave users. An overlay of this type results in very efficient use of the RF spectrum, and is indicative of what needs to be done to relieve the spectral congestion at radio frequencies. >
M. Kullback +4 more
openaire +2 more sources
Spectrally efficient noncoherent communication
IEEE Transactions on Information Theory, 2002This 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, incurs ...
Upamanyu Madhow, D. Warrier
openaire +1 more source
Spectral luminous efficiency as a function of age
Journal of the Optical Society of America A, 2001Spectral luminous efficiency function for a 2-deg field at a photopic level (100 Td) was measured for 91 observers by flicker photometry (FP) and for 97 observers by direct brightness matching (DBM), to find age-related change in the efficiency function as well as to obtain a reliable data set to be used in photometry.
Yasuro Takahashi, Ken Sagawa
openaire +3 more sources
Efficient Algorithm for Spectral Factorization
IFAC Proceedings Volumes, 1984Abstract An algorithm is presented for the spectral factorization of polynomial (or rational) matrices arising in optimal control and filtering theory as well as in network theory. There are two versions of the algorithm: one applicable to continuous-time problems, the other to discrete time ones.
Jan Ježek, Vladimír Kučera
openaire +2 more sources
L-DACS Spectral Efficiency [PDF]
2019 Integrated Communications, Navigation and Surveillance Conference (ICNS), 2019 L-Band Digital Aeronautical Communication System (L-DACS) is the new future terrestrial datalink system recognized in the ICAO roadmap to support the future ATM concepts. LDACS is a wide-band data link for Air-Ground communications which will provide services in all flight phases (En-Route, TMA and Airport) and support ATS B2 services as well as future
openaire +1 more source
Spectral Efficiency Considerations
1997At the end of the day, whatever cellular radio system is considered, the following two factors will have to be taken into account: (i) The number of subscribers that can be connected to the system in an acceptable way for the radio spectrum allocated within a state or country desiring a cellular telephone service and (ii) the
openaire +2 more sources
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].
Xinchen Zhang +3 more
openaire +1 more source
Spectral Efficiency of Multicarrier Schemes for 5G
2019 26th International Conference on Telecommunications (ICT), 2019This 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. +3 more
openaire +2 more sources