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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...
This paper presents the validation of the unified propagation model, the Lisbon University Institute (LUI) model, which is valid for three wireless technologies: Wireless Fidelity, Universal Mobile Telecommunications System and Worldwide Interoperability for Microwave Access. With this purpose in mind, several experimental trials for those technologies were performed in different scenarios, where...
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...
Cellular system deployment can utilize relays both for the capacity improvement and for the coverage extension. This paper studies the performance of the relay enhanced circular cells via the metrics of throughput mean and variance, number of the relay stations, and outage probability. Single-hop links are used as a reference case. Link throughput varies according to four modulation levels whose coverage...
Interest has been growing regarding the use of Wireless Sensor Networks (WSNs) for monitoring and assessing the conditions of infrastructure such as tunnels, bridges and water supply systems. Therefore it is vitally important for us to understand the radio propagation characteristics, especially the Path Loss of these specific environments prior to the deployment of a WSN. The Finite-Difference Time-Domain...
This paper deals with path loss calculation by using measurement results. This paper offers methodology for processing path loss measurement results. First part of the paper gives short introduction. Second part of the paper describes measurement results collection process. Third part of the paper offers methodology for processing measurement results. By using this methodology we can found real propagation...
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