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Article
Range-Coverage Extension Using Smart Antennas in Mobile Communications Systems

Authors: A.H. Sallomi --- S.R. Salim
Journal: Iraqi Journal of Applied Physics المجلة العراقية للفيزياء التطبيقية ISSN: 18132065 23091673 Year: 2009 Volume: 5 Issue: 2 Pages: 25-28
Publisher: iraqi society for alternative and renewable energy sources and techniques الجمعية العراقية لمصادر وتقنيات الطاقة البديلة والمستجدة

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Abstract

The growing demand for wireless communications services is constantly increasing the need for better coverage and quality service. Smart antennas employ collection of individual elements in the form of an array, so, they give rise to narrow beam with increased gain when compared to conventional antennas using the same power. The array gain is the average increase in signal power at the receiver due to a combination of the signals received at all antenna elements. The gain provided by adaptive antenna array is proved to provide an extension in a communication range that depends on the number of array elements. The simulation had done by using power exponent radio wave propagation model shows that the gain provided by smart antennas can extend the range of a cell to cover a larger area and more users than would be possible with omnidirectional or sector antennas. The increase in gain leads to employ fewer base stations to cover a given area.


Article
Linear Adaptive Antenna Array Geometry Effects on Radiation Pattern

Authors: A.H. Sallomi --- H.M. Mikhlif --- S.R. Salim
Journal: Iraqi Journal of Applied Physics Letters الرسائل العراقية في الفيزياء التطبيقية ISSN: 1999656X Year: 2010 Volume: 3 Issue: 1 Pages: 3-6
Publisher: iraqi society for alternative and renewable energy sources and techniques الجمعية العراقية لمصادر وتقنيات الطاقة البديلة والمستجدة

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Abstract

Over the last few years, the number of subscribers to wireless services has increased at an explosive rate. Smart-antenna technology compared to conventional antenna has the ability to increase the number of simultaneous users, and satisfy the requirements of spectral efficiency, and coverage in wireless communication systems. In this paper the radiation pattern and performance of linear smart antenna array is investigated by considering multiple directions of arrivals of signals. The simulations done confirmed that smart antenna systems using Least Mean Square (LMS) algorithm are able to adjust their pattern to enhance desired signals, and reduce interference. The results also show that smart antenna radiation patterns are related to the number of elements in the array, the inter-element spacing, and amplitude distribution.

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