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Cognitive Radio has now become a realistic option for the solution of the spectrum scarcity problem in wireless communication. TV channels (primary user) can be protected by accurate prediction of TV White Spaces (TVWS) by using propagation models. Knowledge of radio propagation is considered essential in any wireless network, with dependence on appropriate deployment and management strategies leading...
Radio wave propagation models are extremely important in mobile network planning and design since it used to predict the Received Signal Strength (RSS). In this work an empirical model was develop to predicate the propagation path loss at the capital of Libya “Tripoli”, based on quit good number of measurements conducted in different places in the target area using the Neural Network approach. This...
The design of communication architecture over a sea environment is challenging since it requires careful analysis of different factors such as multipath propagation, antenna characteristics and mobility that affect a signal. Although existing work has addressed a few factors, there is no work which provides a complete analysis of path loss incorporating such factors and how they affect on Received...
Propagation models are used extensively in signal prediction and interference analysis. Peculiarity of these models gives rise to high prediction errors when deployed in a different environment other than the one initially built for. In this paper, we provide the error bounds on the efficacy at predicting path loss for 10 empirical widely used path loss models. The results show that no single model...
Cellular network design for a specific area requires precise knowledge of the propagation characteristics of the radio channel in that area. This paper discusses the applicability of some well known theoretical models to the specific conditions in Izmir, Turkey. Three path loss models were used to predict the path loss in three different frequency bands. Advanced Okumura-Hata, Advanced Walfisch-Ikegami...
Propagation characteristics in the 2.3-GHz band were studied in a dense urban environment. Experiments at this frequency using WiMAX transmissions were conducted in dense urban western India. Coverage predictions using various models and their comparison with measured data were carried out. Path-loss exponents, mean errors, and standard deviations of all the prediction methods were deduced, and suitable...
This paper presents an unified and empirical propagation model to obtain the received power in mixed scenarios, with outdoor and indoor environments, or in a scenario with only one kind of environment, either for an urban, sub-urban or rural scenario, with or without vegetation. This unified model is called the Lisbon University Institute (LUI) one and can be included into planning tools for wireless...
In view of designing any mobile network system, the fundamental task is to predict the coverage of the proposed system. A wide variety of approaches have been developed over the years to predict coverage using what are known as propagation models. In this paper, we compare the measured path loss obtained for the sub-urban areas with that for the rural areas and then with four propagation models, that...
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