Development of Large Scale Path Loss Model for 3 rd Generation Networks: The Case of Eastern Addis Ababa

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Addis Ababa University


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.



Path Loss Model, Receive Signal Strength,, Path Loss Expponent, Standard Deviation, Hata Model, COST -231 Models, Drive Test