This paper presents results of wide band path loss and delay spread measurements for two representative microcellular environments in the San Francisco Bay area in the 1900 MHz band. The results presented in this paper provide insight into the statistical distributions of measured path loss by showing the validity of a double regression model with a break point at a distance that has first Fres...

Using the wideband indoor channel measurements data at 2.4, 4.75 and 11.5 GHz of [1], a statistical Ultra Wide Band (UWB) channel model is determined. Employing different windows (i.e. Rectangular, Hanning and Blackman-Harris), the impulse response model for the UWB channel is obtained and accordingly, major channel parameters such as path loss exponent, shadowing, root mean square (rms) delay ...

A new path loss model of interference between mobile terminals in a residential area is proposed. The model uses invertible formulas and considers the effects on path loss characteristics produced by paths having many corners or corners with various angles. Angular profile and height pattern measurements clarify three paths that are dominant in terms of their effect on the accurate modeling of ...

Constraint programming is the study of system which is based on constraints. The solution of a constraint satisfaction problem is a set of variable value assignments, which satisfies all members of the set of constraints in the CSP. In this paper the application of constraint satisfaction programming is used in predicting the path loss of various indoor propagation models using chronological ba...

In this paper we derive high probability lower and upper bounds on the excess risk of stochastic optimization of exponentially concave loss functions. Exponentially concave loss functions encompass several fundamental problems in machine learning such as squared loss in linear regression, logistic loss in classification, and negative logarithm loss in portfolio management. We demonstrate an O(d...

-Radio Frequency (RF) propagation is the study of how radio waves broadcast over distances. One of the main problems in mobile radio communication is the loss of propagated RF signal power at the receiver due to fading. When the fading is very strong, the signal is blocked. Modeling of the signal propagation loss is an important element of the design and performance analysis of wireless communi...

BACKGROUND It is not known how the relationship between weight change and mortality is influenced by initial body mass index (BMI) or the magnitude of weight change. METHODS We use the nationally representative Health and Retirement Study (n = 13,104; follow-up 1992-2006) and Cox regression analysis to estimate relative mortality risks for 2-year weight change by initial BMI among 50- to-70-y...