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On the optimum number of beams for fixed beam smart antennas in UMTS FDD

机译:UMTS FDD中固定波束智能天线的最佳波束数

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摘要

Fixed-beam smart antennas are a simple but effective method to boost the downlink capacity of UMTS FDD. In this paper we compare the two possible strategies. Using a four element uniform linear antenna array, we find the optimum number of fixed beams per 120/spl deg/ sector dependent on the direction of departure (DoD) spread at the base station. For the first method we find the optimum number of beams to be four for low DoD spreads and two or three for large DoD spreads. For the second method the optimum number of beams per sector is seven for small DoD spreads and goes down to four or five beams per sector for large DoD spreads depending on base station spacing. By extensive system level simulations, we show, for 1 km inter base station distance, a capacity gain of more than 160% over a conventional 3-sectored reference system by both fixed beam methods.
机译:固定波束智能天线是提高UMTS FDD下行链路容量的简单但有效的方法。在本文中,我们比较了两种可能的策略。使用四元素均匀线性天线阵列,我们找到了每120 / spl度/扇区的固定波束的最佳数量,具体取决于基站散布的方向(DoD)。对于第一种方法,我们发现最佳的光束数量对于低DoD扩展是四个,对于大DoD扩展是两个或三个。对于第二种方法,对于较小的DoD扩展,每个扇区的最佳波束数量为7个,对于较大的DoD扩展,每个扇区的最佳波束数量为4至5个,具体取决于基站的间隔。通过广泛的系统级仿真,通过两种固定波束方法,我们显示出在1 km的基站间距离上,与传统的3扇区参考系统相比,容量增益超过160%。

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