The optimization between the processing gain and the theoretically achievable average channel capacity per user (in the Shannon sense) of a constant total system's allocated bandwidth hybrid direct sequence/fast frequency hopping codedivision multiple-access (DS/FFH-CDMA) cellular system, when operating in a Rayleigh fading environment, is presented. ... Pagination p 902-910 Subject Engineering...

We derive an analytical theory of the prestellar core initial mass function based on an extension of the Press-Schechter statistical formalism applied in cosmology. Our approach relies on the general concept of the gravo-thermal and gravo-turbulent collapse of a molecular cloud, with a selection criterion based on the thermal or turbulent Jeans mass, which yields the derivation of the mass spec...

In this paper, we study random Blaschke products, acting on the unit circle, and consider cocycle of Perron–Frobenius operators Banach spaces analytic functions an annulus. We completely describe Lyapunov spectrum these cocycles. As a corollary, obtain simple product system where has infinitely many distinct exponents, but arbitrarily small natural perturbations cause complete collapse spectrum...

We investigate disorder effects on Landau levels in Dirac electron systems with the use of a non-Hermitian quasiparticle Hamiltonian formalism. This formalism reveals that spin-dependent scattering rates induce spectrum collapse levels, i.e., disappearance energy gaps between n-th and -n-th under finite external magnetic field. The occurs both weak strong field regimes, thus showing reentrant b...

Neutrinos emitted during stellar core collapse up to their trapping phase carry information about the stage from which the Supernova explosion process initiates. The dominant νe emission mechanism is by electron capture on free protons and f-p shell nuclei and the spectrum of these neutrinos is a function of the ambient physical conditions within the core as well as the nuclear equation of stat...