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GSM Technology and Link Analysis

In mobile radio environment, a part of the electromagnetic energy radiated by the antenna of the transmitting station reaches the receiving station by propagating through different paths. Predictions of signal strength and propagation coverage area are vital aspects in the design of mobile radio system. There are basically three approaches used in obtaining received radio signal. The first one is the empirical model approach which not adequately considers local terrain features, which determines characteristics of radio propagation. The second is the measures data approach which is very tedious and time consuming, especially in large cities and rural areas. The last model happens to be a combination of the previous mentioned approaches. Here theoretical models are used and appropriately adapted to a local environment based on selected radio signal measurement.

Propagation loss shows a particular logarithmic behavior to the distance. Bearing this in mind and the third above mentioned approach, one can easily adapt a prevalent model such as the Hata-Okumura model to suit a particular mobile radio environment and has widespread use in land mobile communication. It is based on an extensive experimental study of propagation loss over different terrain.

In this Report, the Hata-Okumura model is thus given a special preference.

Overall, results were within expectations despite propagation measuring constraints. The MATLAB approach towards simulation can in the near future provide a speedy and economic service to communications system design engineers.


  •     Ajit Raj Kafle
  •     Dipesh Paudel
 

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