The study of propagation characteristics is a fundamental step in mobile radio engineering; which is intended to achieve maximum performance for a mobile radio system. To do this, the propagation models are essential tools for this study such as the evaluation of the signal strength received by a mobile terminal, the evaluation of coverage radii and deduce the number of cells needed to cover a given area, such as radio planning, which in turn is the step that aims to estimate the necessary equipment and configurations of the radio interface. In this work we adopt the standard K factor model and OKUMURA HATA model to demonstrate a propagation model adapted to the physical environment of the city of Annaba in Algeria using a linear regression algorithm based on the ordinary least squares method. Radio measurements were carried out on the CDMA network of operator Mobilis. The calculation of the square root of the mean square error between the actual data and the radio measurements and the prediction data derived from the model implemented allowing the validation of the results obtained. A comparative study between the value of the RMSE obtained by the new model and those obtained by the models K standard factors and the model of OKUMURA HATA allows us to conclude that the new model is better adapted to our local environment than that of OKUMURA HATA. The new model obtained can help increase the performance of mobile radio systems deployed in our territory.Keywords: Model K factor, Model of OKUMURA HATA Linear regression.
IntroductionTo obtain a propagation model that accurately reflects propagation characteristics radio in a given environment. It is necessary to rely on network coverage, the capacity of the network as well as the quality of service of it which are the essential points of a network planning. In order to have access to all the services offered by a network, it is necessary to give particular importance to the dimensioning of the latter. The use of propagation models is very widespread for the planning and installation of networks or also for the extensions of already existing networks, especially in the new towns. Contributing to the improvement of the performance of mobile radio systems. To determine the characteristics of the radio propagation channel, the tests of the concrete propagation modes and the calibration of the existing models are essential to have a propagation models that accurately represent the radio propagation characteristics of the environment being studied. Several types of software allow the improvement of the performance of mobile radio systems through the planning and sizing of mobile networks including prediction models namely: ASSET of AIRCOM company in England, Atoll of the French company FORK ... etc.Some authors investigate the calibration of propagation models, Like Chhaya Dalila, and Garlic