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首页> 外文期刊>Aerospace and Electronic Systems, IEEE Transactions on >Effect of Antenna Power Roll-Off on the Performance of 3G Cellular Systems from High Altitude Platforms
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Effect of Antenna Power Roll-Off on the Performance of 3G Cellular Systems from High Altitude Platforms

机译：天线功率下降对高空平台3G蜂窝系统性能的影响

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摘要

An investigation into the impact of antenna radiation patterns on the performance of a 3G mobile communication system provided a single high-altitude platform (HAP) is presented. Use of elliptical and circular beam antennas is examined for a 91-cell system. Crucial performance parameters are shown to be the mainlobe power roll-off and sidelobe level. It is presented that the optimum power roll-off from cell center to the cell edge ranges between 10–35 dB, which is dependent on the types of antennas used, sidelobe level, and antenna gain strategy employed. Elliptical beam antennas are proven to provide the best solution, but circular beam antennas with their gain adjusted to reduce the degree of cell overlap and compensate for increasing path loss are shown to provide similar performance, with the advantage that they are practically more realizable. It is shown that poorer overlap performance can be partially compensated for by an increased power roll-off at the cell edge, a strategy that is employed in the case of the gain adjusted circular beam antennas. The impact of cell radius and elevation angles is also assessed.
机译：提出了对天线辐射方向图对3G移动通信系统性能的影响的研究，该研究提供了单个高空平台（HAP）。对于91单元系统，检查了椭圆形和圆形波束天线的使用。关键性能参数显示为主瓣功率滚降和旁瓣水平。结果表明，从小区中心到小区边缘的最佳功率衰减范围在10–35 dB之间，这取决于所用天线的类型，旁瓣电平和所采用的天线增益策略。椭圆形波束天线已被证明可以提供最佳解决方案，但圆形波束天线的增益经过调整以减少单元重叠的程度并补偿路径损耗的增加，可以提供类似的性能，其优点是实际上更易于实现。结果表明，较差的重叠性能可以通过在小区边缘处增加的功率衰减来部分补偿，这是在增益调整后的圆形波束天线的情况下采用的一种策略。还评估了单元半径和仰角的影响。

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