Behavior of modified MVDR beamformer algorithm with realistic scenario

A. Khaldoon, Md. Mijanur Rahman, L. A. Hassnawi, R. Ahmad, S. S. Balasem
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引用次数: 1

Abstract

Smart antenna is a system based on the antenna elements which are distributed uniformly as array and on the beamformig (BF) algorithm. Each element in the array receives the wave plane signals individually, and then, the beamformer tries to produce the optimum weight for each element with respect to the reference element in the array. This technique is called beamforming. MVDR is one of the most important algorithms that provide optimum weight. The array elements are weighted to direct the main beam of the transmitted energy to the direction of the desired signal as well as direct null towards undesired signal. Mismatch may be occurs due to the location of reference element within the array. Mismatch in MVDR leads to suppress the desired signal and treats as interference. This paper presents a new technique to re-localize the selected reference element within the array. The reference element is chosen to be in the middle of the array instead of one end side of the array. The new location becomes more realistic with respect to received signals directions. Simulation results clarify that the modified MVDR overcomes the mismatch and self null phenomena in classical MVDR.
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现实场景下改进MVDR波束形成算法的行为
智能天线是基于天线单元以阵列形式均匀分布并采用波束形成(BF)算法的系统。阵列中的每个元件单独接收波平面信号,然后,波束形成器尝试为每个元件相对于阵列中的参考元件产生最佳权重。这种技术被称为波束成形。MVDR是提供最优权重的最重要算法之一。对阵列单元进行加权,使发射能量的主束指向所需信号的方向,并将零束指向不需要的信号。由于引用元素在数组中的位置不同,可能会出现不匹配。MVDR中的失配导致所需信号被抑制,被视为干扰。本文提出了一种重新定位选定参考元素的新方法。引用元素被选择在数组的中间,而不是数组的一端。相对于接收到的信号方向,新的位置变得更加真实。仿真结果表明,改进后的MVDR克服了经典MVDR中的失配和自零现象。
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