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Analysis and performance evaluation of Relay Assisted OFDMA cellular systems with different Beamforming techniques

机译：不同波束赋形技术的中继辅助OFDMA蜂窝系统分析与性能评估

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This paper addresses the Co-Channel Interference (CCI) reduction in Relay Assisted (R-A) cellular systems using Beamforming (BF) techniques. Analytical treatments are conducted. The network performance improvements through reducing the CCI are evaluated using three different configurations of applying BF. These configurations represent Relay Station (RS) do BF only, Base Station (BS) do BF only and both RS and BS do BF. Additionally, the considered BF techniques denote the horizontal, vertical, and Three Dimensional (3D) BF techniques. Therefore, each configuration consists of three different scenarios. Accordingly, nine different scenarios are studied. A comparison of these scenarios is introduced to enhance the network Quality of Service (QoS). Moreover, closed-form expressions for worst-cases Cell Edge User's (CEU's) Signal to Interference Ratio (SIR), Cell Center User's (CCU's) SIR and inner radius are implemented. Furthermore, various performance evaluation metrics are used to compare the different scenarios. The results reveal, that the performance of vertical BF is close to that of the 3D BF in low Pathloss (PL) exponent range. Therefore, applying vertical BF is preferable from the network cost and power consumption perspectives. Furthermore, it is observed, that the configuration of RS do BF is superior to other configurations when horizontal or vertical BF technique is employed. Additionally, the configuration of both RS and BS do BF outperforms the other configurations when 3D BF is applied. However, as unexpected it performs worse than them when the other BF techniques are applied. The work outcomes attain much higher CEU's SIR improvement. Therefore, the coverage probability is increased. Thus, more users can be served by the network. Accordingly, the total network cost is reduced. So, this treatment not only improves the network performance, but also it reduces the total network cost. (C) 2018 Published by Elsevier B.V.
机译：本文介绍了使用波束成形（BF）技术在中继辅助（R-A）蜂窝系统中减少同频干扰（CCI）的方法。进行分析处理。通过应用BF的三种不同配置评估了通过降低CCI来提高网络性能。这些配置表示中继站（RS）仅执行BF，基站（BS）仅执行BF，RS和BS均执行BF。此外，考虑的BF技术表示水平，垂直和三维（3D）BF技术。因此，每种配置都包含三种不同的方案。因此，研究了九种不同的情况。对这些方案进行了比较，以增强网络服务质量（QoS）。此外，实现了针对最坏情况的小区边缘用户（CEU）的信干比（SIR），小区中心用户（CCU）的SIR和内半径的闭式表达式。此外，各种性能评估指标用于比较不同方案。结果表明，在低Pathloss（PL）指数范围内，垂直BF的性能接近3D BF。因此，从网络成本和功耗的角度来看，最好使用垂直BF。此外，观察到，当采用水平或垂直BF技术时，RS do BF的配置优于其他配置。此外，当应用3D BF时，RS和BS do BF的配置均优于其他配置。但是，出乎意料的是，当应用其他高炉技术时，其性能比它们差。工作成果使CEU的SIR改善更高。因此，覆盖概率增加。因此，网络可以为更多的用户提供服务。因此，降低了总的网络成本。因此，这种处理方法不仅可以提高网络性能，而且可以降低总网络成本。 （C）2018由Elsevier B.V.发布

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