Results 1 to 10 of about 36,464 (226)

Statistical Beamforming for Multi-Set Space–Time Shift-Keying-Based Full-Duplex Millimeter Wave Communications

open access: yesMathematics, 2023
Full-duplex (FD) communication has been shown to provide an increased achievable rate, while millimeter wave (mmWave) communications benefit from a large available bandwidth that further improves the achievable rate.
Abdulah Jeza Aljohani   +4 more
doaj   +1 more source

Optimized Statistical Beamforming for Cooperative Spectrum Sensing in Cognitive Radio Networks

open access: yesMathematics, 2023
In cognitive radio (CR), cooperative spectrum sensing (CSS) employs a fusion of multiple decisions from various secondary user (SU) nodes at a central fusion center (FC) to detect spectral holes not utilized by the primary user (PU). The energy detector (
Ubaid M. Al-Saggaf   +3 more
doaj   +1 more source

The Riesz basis property of an indefinite Sturm-Liouville problem with non-separated boundary conditions [PDF]

open access: yes, 2013
We consider a regular indefinite Sturm-Liouville eigenvalue problem \{$-f" + q f = \lambda r f$} on $[a,b]$ subject to general self-adjoint boundary conditions and with a weight function $r$ which changes its sign at finitely many, so-called turning ...
Fleige, Andreas   +2 more
core   +3 more sources

Cohomology and Decomposition of Tensor Product Representations of SL(2,R) [PDF]

open access: yes, 2002
We analyze the decomposition of tensor products between infinite dimensional (unitary) and finite-dimensional (non-unitary) representations of SL(2,R). Using classical results on indefinite inner product spaces, we derive explicit decomposition formulae,
André van Tonder   +26 more
core   +4 more sources

Sleep spindle detection based on non-experts: A validation study. [PDF]

open access: yesPLoS ONE, 2017
Accurate and efficient detection of sleep spindles is a methodological challenge. The present study describes a method of using non-experts for manual detection of sleep spindles.
Rui Zhao   +6 more
doaj   +1 more source

Realizations of Causal Manifolds by Quantum Fields [PDF]

open access: yes, 1997
Quantum mechanical operators and quantum fields are interpreted as realizations of timespace manifolds. Such causal manifolds are parametrized by the classes of the positive unitary operations in all complex operations, i.e.
C. Becchi   +27 more
core   +3 more sources

Various Half-Eigenvalues of Scalar p-Laplacian with Indefinite Integrable Weights

open access: yesAbstract and Applied Analysis, 2009
Consider the half-eigenvalue problem (ϕp(x′))′+λa(t)ϕp(x+)−λb(t)ϕp(x−)=0 a.e.
Wei Li, Ping Yan
doaj   +1 more source

Multiplicity results for asymmetric boundary value problems with indefinite weights

open access: yesAbstract and Applied Analysis, 2004
We prove existence and multiplicity of solutions, with prescribed nodal properties, to a boundary value problem of the form u″+f(t,u)=0, u(0)=u(T)=0.
Francesca Dalbono
doaj   +1 more source

Inhomogeneous Neumann problem with critical Sobolev exponent

open access: yesAdvances in Nonlinear Analysis, 2012
We investigate the solvability of the inhomogeneous Neumann problem involving the critical Sobolev exponent. In particular, we discuss the impact of the shape of the graph of the coefficient of the critical exponent on the existence of a solution.
Chabrowski Jan
doaj   +1 more source

Existence Result for a Class of Elliptic Systems with Indefinite Weights in R2

open access: yesBoundary Value Problems, 2008
We obtain the existence of a nontrivial solution for a class of subcritical elliptic systems with indefinite weights in R2. The proofs base on Trudinger-Moser inequality and a generalized linking theorem introduced by Kryszewski and Szulkin.
Sanyang Liu, Guoqing Zhang
doaj   +1 more source

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