一种新型的OFDM智能天线

根据自适应天线阵列理论,结合给定的参考波束的误差,引入虚拟干扰的概念,对目标波束图形状进行调整,提出一种新的可以应用于任意类型天线阵列的波束综合算法.应用提出的新算法,在主瓣和旁瓣位置都可以对波束进行有效的调节.最终获得阵列的最优权矢量,能够最小化目标波束图与参考波束图间的差异.理论分析与仿真结果表明,与现有的同类算法相比,该算法能更有效地获得与参考波束基本相符的波束.应用于OFDM智能天线系统时,对不同子载波频率上信号进行单独处理,利用该算法进行波束综合,能够在整个有效频段,使所有子载波上获得基本一致的阵列输出.

A new pattern synthesis algorithm using for design of OFDM smart antenna

Based on the adaptive array theory, this paper presents a new pattern synthesis algorithm for arbitrary arrays.According to the differences between the synthesized pattern and the reference pattern,artificial interferers are introduced to adjust the pattern shape.The proposed algorithm can control the pattern shape in both the mainlobe and sidelobe regions,and obtain an optimal array weight vector that can minimize the difference between patterns.Compared with the other algorithms,the new method can obtain a synthesized pattern identical with the reference pattern.By applying the proposed algorithm to dealing with the smart antennas for OFDM system,a constant pattern can be obtained over the different subcarriers and so can a frequency-nvariant beam forming.