Development of Large Scale Path Loss Model for 3 rd Generation Networks: The Case of Eastern Addis Ababa
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Date
2020-06
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Addis Ababa University
Abstract
The design of efficient cellular system requires a detail understanding of propagation
characteristics of mobile channel. A signal propagation through a channel undergo two kind of
variations; large scale and small scale path loss. This thesis focuses on large scale propagation
model for Eastern Addis Ababa of Ethio telecom. The results are evaluated based on different
parameters such as coverage radius, antenna height, and Eb/No. And network planning, operation,
maintenance and upgrade depend on radio channel environment and property. Radio propagation
parameters that affect the receive signal level on radio links are analyze the best path loss model
for prediction of the receive signal level is determine. This thesis work on the most commonly
used path loss models among others, for 3G based cellular systems in Eastern Addis Ababa. It
collected two types of data, static and dynamic data. From the static data it get eNodeB and
mobile station height in meter and operating frequency in mega Hertz that is 2100 Mhz. And
using this data it modeled Hata and COST 231 empirical model. And from drive test it collected
dynamics data, distance from transmitter to receiver and receive signal strength in dBm. And
from this data it get path loss exponent, reference path loss, standard deviation and MSE for the
four eNodeB and its average that are located in Eastern Addis Ababa. Several electronic
equipment are used for the measurement for RSS such as Samsung S5 mobile that are installed
Nemo software , Global positioning System((BU353 GPS) and Laptop that are installed Actix
software and data export to Excel program. The selected sites are Bole Homes, Bole Intentional
Stadium, Summit Beverage and Summit Savory. The path loss exponent for the above four
Eastern Addis Ababa place are 2.87, 5.38, 4.55 and 2.58 respectively .And standard deviation
was evaluated as 6.24dB, 4.78dB, 6.11dB and 7.58dB respectively. And path loss model was
developed as ‘PL =114.5 + 45.5 log (d/do)’ for Summit Beverage. For Bole International
Stadium the path loss model are ‘PL=95.9+53.8log (d/do)’. For Bole Homes modeling and
Summit Savory ‘PL=116.5+28.7 log (d/do)’ and ‘PL=109.17+25.8 log (d/do)’respectively. And
MATLAB R2015a was used for simulation.
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Keywords
Path Loss Model, Receive Signal Strength,, Path Loss Expponent, Standard Deviation, Hata Model, COST -231 Models, Drive Test