Development Of Large Scale Path Loss Model For 3 Rd Generation Networks The Case Of Eastern Addis Ababa

The design of efficient cellular system requires a detail understanding of propagationrncharacteristics of mobile channel. A signal propagation through a channel undergo two kind ofrnvariations; large scale and small scale path loss. This thesis focuses on large scale propagationrnmodel for Eastern Addis Ababa of Ethio telecom. The results are evaluated based on differentrnparameters such as coverage radius, antenna height, and Eb/No. And network planning, operation,rnmaintenance and upgrade depend on radio channel environment and property. Radio propagationrnparameters that affect the receive signal level on radio links are analyze the best path loss modelrnfor prediction of the receive signal level is determine. This thesis work on the most commonlyrnused path loss models among others, for 3G based cellular systems in Eastern Addis Ababa. Itrncollected two types of data, static and dynamic data. From the static data it get eNodeB andrnmobile station height in meter and operating frequency in mega Hertz that is 2100 Mhz. Andrnusing this data it modeled Hata and COST 231 empirical model. And from drive test it collectedrndynamics data, distance from transmitter to receiver and receive signal strength in dBm. Andrnfrom this data it get path loss exponent, reference path loss, standard deviation and MSE for thernfour eNodeB and its average that are located in Eastern Addis Ababa. Several electronicrnequipment are used for the measurement for RSS such as Samsung S5 mobile that are installedrnNemo software , Global positioning System((BU353 GPS) and Laptop that are installed Actixrnsoftware and data export to Excel program. The selected sites are Bole Homes, Bole IntentionalrnStadium, Summit Beverage and Summit Savory. The path loss exponent for the above fourrnEastern Addis Ababa place are 2.87, 5.38, 4.55 and 2.58 respectively .And standard deviationrnwas evaluated as 6.24dB, 4.78dB, 6.11dB and 7.58dB respectively. And path loss model wasrndeveloped as ‘PL =114.5 + 45.5 log (d/do)’ for Summit Beverage. For Bole InternationalrnStadium the path loss model are ‘PL=95.9+53.8log (d/do)’. For Bole Homes modeling andrnSummit Savory ‘PL=116.5+28.7 log (d/do)’ and ‘PL=109.17+25.8 log (d/do)’respectively. AndrnMATLAB R2015a was used for simulation.

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