Study of Smart Antenas on Mobile Communications

CONCLUSION AND RECOMMANDATIONS.

By giving an introduction to basic antenna theory, this project had led to a better understanding of antennas with emphasis on array antennas.

The evolution path from omni directional to the smart antenna system was shown before proving the switching-beam array and adaptive array approaches i.e. classifications of smart antenna.

A detailed description on system aspect of smart antenna was presented and it includes the benefits of smart antenna system, multipath and problems associated with it.

Various schemes such as FDMA, TDMA, CDMA and SDMA could be utilized to exploit the range of frequencies available for mobile communication technologies.

Radiation pattern and performance of array antennas have been investigated. Simulation results show that the radiation pattern depends on the number of elements in the array, the inter-elements spacing, and an amplitude distribution. Thus, there is always a compromise between the influencing parameters.

In conclusion, the project shows that smart antennas offer several possibilities than omni directional or sector antennas. They increase coverage through range extension, capacity through interference reduction or SDMA, and mitigation of multipath fading and intersymbol interference. They can be integrated in a given base station without any change on the adjacent cell or on the mobile station.

Because of the key characteristics presented above, smart antennas system are recommended to mobile communications companies to be used especially in big towns where the number of subscribers is large.

However, further studies are required for the future of mobile dimension. This project covers only two methods; Dolph-Chebychev and Woodward-Lawson method, but Fourier Transform and Taylor Line-Source methods may be used also in other research.

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