53,459 research outputs found
Finite Blocklength Rates over a Fading Channel with CSIT and CSIR
In this work, we obtain lower and upper bounds on the maximal transmission
rate at a given codeword length , average probability of error
and power constraint , over a finite valued, block fading additive
white Gaussian noise (AWGN) channel with channel state information (CSI) at the
transmitter and the receiver. These bounds characterize deviation of the finite
blocklength coding rates from the channel capacity which is in turn achieved by
the water filling power allocation across time. The bounds obtained also
characterize the rate enhancement possible due to the CSI at the transmitter in
the finite blocklength regime. The results are further elucidated via numerical
examples.Comment: 10 pages, 2 figures, results for finite valued fading states, typos
corrected, proofs elaborated, lower bound under short term power constraint
improve
Magnetic moments of spin {1/2}^+ and spin {3/2}^+ charmed baryons
The magnetic moments of spin and spin charmed baryons
have been calculated in chiral constituent quark model (CQM). The effects
of configuration mixing and quark masses have also been investigated. The
results are not only in good agreement with existing experimental data but also
show improvement over other phenomenological models.Comment: 5 pages, 2 tables. Presented at the XIII International Conference on
Hadron Spectroscopy, Florida State University, Florida, USA, November
29-December 4, 200
Interactions of satellite-speed helium atoms with satellite surfaces. 3: Drag coefficients from spatial and energy distributions of reflected helium atoms
Spatial and energy distributions of helium atoms scattered from an anodized 1235-0 aluminum surface as well as the tangential and normal momentum accommodation coefficients calculated from these distributions are reported. A procedure for calculating drag coefficients from measured values of spatial and energy distributions is given. The drag coefficient calculated for a 6061 T-6 aluminum sphere is included
Electric and Magnetic fields due to Dirac particles in FRW spacetime
Some solutions of the Maxwell equations with Dirac particles for the source
in FRW spacetime are discussed. The Green's function of the equation for the
radial component of the Maxwell fields, F_{r\eta} and F_{\theta\phi} is solved.
Green's function is found to reduce to that of Minkowskian spacetime in the
appropriate limit. Also, the Lienard-Wiechert type solution is derived. Also,
the solutions with the Dirac particle current is also presented. It is found
that the F_{r\eta} is composed of even angular momentum states while the odd
states constitue F_{\theta\phi} .Comment: 8 pages including 2 figure
- …