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首页> 外文期刊>The mediterranean journal of electronics and communications >Improving the Performance of Wireless Communication Systems in Indoor Environments
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Improving the Performance of Wireless Communication Systems in Indoor Environments

机译：在室内环境中改善无线通信系统的性能

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摘要

This paper aims to improve the performance of wireless communication systems in indoor environments especially in high buildings where large number of mobile users are clustered as vertical hotspots. In such indoor environments the mobile wireless services degrade due to such users' distributions, one of the solutions to overcome this shortage may be the use of distributed antenna systems (DASs) that are usually used in outdoor environments. In this research, a model for distributed antenna system is developed and enhanced by utilizing the benefits of spread spectrum in combating interference. Exact and closed bit error rate (BER) mathematical expressions are derived for the first time to study the suggested communication system that show a significant improvement in system performance. The validity of the derived BER expressions are ensured by demonstrating the numerical results. These results also lead us to another important conclusion, that is in high building indoor environments the frequency channels can be reused among floors in very efficient way with negligible inter-floor interference and remarkable reduction in intra-floor interference. This can be achieved by satisfying two conditions: first; using WCDMA DAS utilizing from combining the benefits of distributed antenna system along with the benefits of spreading spectrum in reducing interference, second; is the condition of one floor separation or more with minimum floor penetration loss of -13 dB.
机译：本文旨在提高室内环境中无线通信系统的性能，尤其是在大量移动用户聚集为垂直热点的高层建筑中。在这样的室内环境中，移动无线服务由于此类用户的分布而降低，克服这一不足的解决方案之一可能是使用通常在室外环境中使用的分布式天线系统（DAS）。在这项研究中，通过利用扩频对抗干扰的优势，开发并增强了分布式天线系统的模型。首次得出精确和封闭的误码率（BER）数学表达式来研究建议的通信系统，该系统显示出系统性能的显着改善。通过证明数值结果，可以确保导出的BER表达式的有效性。这些结果也使我们得出另一个重要结论，那就是在高层建筑室内环境中，可以以非常有效的方式在各个楼层之间重用频道，而楼层间的干扰可以忽略不计，并且楼层间的干扰也可以大大降低。这可以通过满足两个条件来实现：第二，结合使用分布式天线系统的优点和扩展频谱的优点来使用WCDMA DAS；是一层或更多层地板的条件，最小地板穿透损耗为-13 dB。

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