19,651 research outputs found
On Berry--Esseen bounds for non-instantaneous filters of linear processes
Let , where the are
i.i.d. with mean 0 and at least finite second moment, and the are assumed
to satisfy with . When ,
is usually called a long-range dependent or long-memory process. For a certain
class of Borel functions , , from
to , which includes indicator functions and
polynomials, the stationary sequence is
considered. By developing a finite orthogonal expansion of
, the Berry--Esseen type bounds for the normalized sum
are obtained when
obeys the central limit theorem with positive limiting variance.Comment: Published in at http://dx.doi.org/10.3150/07-BEJ112 the Bernoulli
(http://isi.cbs.nl/bernoulli/) by the International Statistical
Institute/Bernoulli Society (http://isi.cbs.nl/BS/bshome.htm
Comparison of Nonlinear Phase Noise and Intrachannel Four-Wave-Mixing for RZ-DPSK Signals in Dispersive Transmission Systems
Self-phase modulation induced nonlinear phase noise is reduced with the
increase of fiber dispersion but intrachannel four-wave-mixing (IFWM) is
increased with dispersion. Both degrading DPSK signals, the standard deviation
of nonlinear phase noise induced differential phase is about three times that
from IFWM even in highly dispersive transmission systems.Comment: 3 pages, 2 figure
Polyelectrolyte Adsorption on Charged Substrate
The behavior of a polyelectrolyte adsorbed on a charged substrate of
high-dielectric constant is studied by both Monte-Carlo simulation and
analytical methods. It is found that in a low enough ionic strength medium, the
adsorption transition is first-order where the substrate surface charge still
keeps repulsive. The monomer density at the adsorbed surface is identified as
the order parameter. It follows a linear relation with substrate surface charge
density because of the electrostatic boundary condition at the charged surface.
During the transition, the adsorption layer thickness remains finite. A new
scaling law for the layer thickness is derived and verified by simulation.Comment: Proceedings of the 3rd Symposium on Slow Dynamics in Complex Systems,
3-8 November 2003, Sendai, Japa
Purchasing Power Parity and Country Characteristics: Evidence from Time Series Analysis
This paper investigates the relationships between country characteristics and the validity of PPP. We use three alternative time series methods to test for the stationarity of real exchange rates for each of the 72 countries over the period from 1976 to 2005. Our result shows that the evidence of PPP exhibits geographic difference. It is most likely to find stationary real exchange rates for European countries, whereas it is least likely to obtain the result of supporting PPP for Asian countries. We then use a probit regression model to examine if county characteristics are related to the validity of PPP. The probit regression result reveals that the validity of PPP decreases with inflation rate and increases with nominal exchange rate volatility.Purchasing power parity, Country characteristics, Unit root tests
Simultaneous Amplitude and Phase Measurement for Periodic Optical Signals Using Time-Resolved Optical Filtering
Time-resolved optical filtering (TROF) measures the spectrogram or sonogram
by a fast photodiode followed a tunable narrowband optical filter. For periodic
signal and to match the sonogram, numerical TROF algorithm is used to find the
original complex electric field or equivalently both the amplitude and phase.
For phase-modulated optical signals, the TROF algorithm is initiated using the
craters and ridges of the sonogram.Comment: 10 pages, 5 figure
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