OFDM系统智能天线设计中的波束综合算法

基于自适应天线阵列理论。提出了一种新的可以应用于任意类型天线阵列的波束综合算法。根据与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。应用本文提出的新算法，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，本算法能更有效地获得与参考波束基本相符的波束。在设计应用于OFDM智能天线系统时，通过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，所有子载波上获得基本一致的阵列输出。

A New Pattern Synthesis Algorithm Using for the Design of OFDM Smart Antenna

Based on adaptive array theory,a new pattern synthesis algorithm for arbitrary arrays is presented. 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. Comparison with the other algorithms,the new method can obtain a synthesized pattern that is the same as the reference pattern. In the designing of smart antennas for OFDM system,with the proposed algorithm,an constant pattern can be obtained over the different subcarriers. A frequency-invarlant beamforming could be obtained.