TITLE:
An Improved Characterization of Small Scale Fading Based on 2D Measurements and Modeling of a Moving Receiver in an Indoor Environment
AUTHORS:
Redhwan Mawari, Alexander H. Henderson, Muhammad B. Akbar, Gregory D. Durgin, Mohamed Zohdy
KEYWORDS:
Small-Scale Fading, Gaussian, Rayleigh, Rician, TWDP, Maximum Likelihood
JOURNAL NAME:
Journal of Signal and Information Processing,
Vol.7 No.3,
August
11,
2016
ABSTRACT: Accurately characterizing the wireless
small-scale fading channel has been a challenging task in the wireless
communication era due to the surrounding environment. Therefore, this paper
introduces a new technique to experimentally characterize the small-scale
fading taking under consideration real environmental conditions. By conducting
a two dimensional measurement while the mobile receiver is moving; a more
accurate channel will be achieved. Two-dimensional measurement refers to
collecting data from the receiver along the x and y direction. The two-dimensional
measurement data contain far more information than a one-dimensional data
collected. In order to represent the small-scale channel along with the real
environmental conditions, new approaches are necessary to configure the
two-dimensional system and to analyze the 2D data. The new approach this paper
introduces for the characterization is that the measurements are conducted on a
receiver while it is moving in a two dimensional manner, under different
scenarios, Line-of-sight, Non-line-of-sight, and Two-wave-Diffuse Power. The
experiment was conducted in a 7 meters long by 4 meters wide room, wherein the
distance between the transmitter antenna and receiver is about 3 meters. Those
scenarios represent different real-time conditions where obstacles differ from
one scenario to another. For example, the line of sight scenario assumes there
a clear line of sight between transmitter and receiver, Non line of sight
assumes many obstacles between the transmitter and receiver, i.e. walls,
cabinets, etc. and Two Wave Diffuse Power assumes a metallic reflector
surrounding the receiver. The experiment showed more accurate results when
compared to the one dimensional measurement that has been done in the past where
receiver is moving in one direction and also receiver being fixed where a
constructive and destructive interference is not captured. The two dimensional
measurement technique, i.e. capturing data while receiver moving in both x and
y directions, provided essential information regarding the constructive and
destructive interference patterns caused by the interaction between the
receiver while moving and the obstacles surrounding the receiver.