DoA estimation through modified unitary MUSIC algorithm for CRLH leaky-wave antennas
DoA estimation through modified unitary MUSIC algorithm for CRLH leaky-wave antennas
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DOI：
10.1109/pimrc.2013.6666152
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发表时间：
2013-12
期刊：
影响因子：
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通讯作者：
H. Paaso;A. Mämmelä;D. Patron;K. Dandekar
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文献类型：
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作者：
H. Paaso;A. Mämmelä;D. Patron;K. Dandekar
本文提出了一种改进的酉多信号分类（MUSIC）算法，用于双端口复合左右手（CRLH）漏波天线（LWA）。该算法只需要实值运算来估计接收信号的到达方向，这将简化未来的硬件实现。CRLH LWA由超材料单元的级联组成，使用变容二极管进行周期性调制。通过改变串联和并联变容二极管两端的电压，天线能够均匀地控制其辐射方向图。提出的修正酉MUSIC算法使用两个天线的输入端口来估计DoA。现有的MUSIC实现需要在复值信号子空间中进行特征值分解，这导致高度复杂的硬件实现。我们提出的改进的酉MUSIC算法可以降低计算复杂度，因为它使用酉变换将接收信号的复值协方差矩阵变换为实值矩阵。实验证明，该算法的性能，通过使用CRLH LWA在电波暗室设施和估计的DoA的结果是在良好的协议与预测的角度。
In this paper, we propose a modified unitary multiple signal classification (MUSIC) algorithm for a two-port composite right/left handed (CRLH) leaky-wave antenna (LWA). The algorithm requires only real-valued operations to estimate direction of arrival (DoA) of the received signals, which will simplify future hardware implementation. The CRLH LWA consists of a cascade of metamaterial unit cells, periodically modulated using varactor diodes. By changing the voltages across series and shunt varactors, the antenna is able to uniformly steer its radiation pattern. The proposed modified unitary MUSIC algorithm uses both antennas' input ports to estimate the DoA. Existing MUSIC implementations requires eigenvalue decomposition in the complex-valued signal subspace, which results in highly complex hardware implementation. The computational complexity can be reduced using our proposed modified unitary MUSIC algorithm since it transforms the complex-valued covariance matrix of the received signals to a real-valued matrix using unitary transformations. The performance of the algorithm is experimentally demonstrated by using a CRLH LWA within an anechoic chamber facility and the estimated DoA results are in good agreement with the predicted angles.