Joint Estimation of DOA and TDOA of Multiple Reflections in Mobile Communications
Joint Estimation of DOA and TDOA of Multiple Reflections in Mobile Communications
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DOI：
10.1109/access.2016.2584088
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发表时间：
2016-06
期刊：
影响因子：
3.9
通讯作者：
Lutao Liu;Huan-Chang Liu
中科院分区：
文献类型：
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作者：
Lutao Liu;Huan-Chang Liu
在多径通信场景中，估计每个多径信号的方向和相对延迟通常是相关的。我们提出了一种有效的算法，这些参数的同时估计，通过重新迭代超分辨率，波束形成，和MUSIC类搜索技术。该算法首先对多径信号进行波达方向（DOA）分离和估计。采用线性约束最小功率波束形成方法，得到期望信号在一定入射角下的发射时间函数。然后，入射信号的到达时间差（TDOA）映射到频域中的相移。利用期望信号和接收数据的DFT，我们可以通过MUSIC搜索在频域中分离由于时间延迟引起的相移。同时，自动确定估计的DOA和TDOA的配对。计算机模拟说明所提出的算法的性能与Cramer-Rao界。
In a multipath communication scenario, it is often relevant to estimate the directions and relative delays of each multipath signal. We present an effect algorithm for the simultaneous estimation of these parameters by re-iterative super-resolution, beamforming, and MUSIC-like searching techniques. The algorithm first separates and estimates direction of arrival (DOA) of the multipath signals. Linear constrained minimum power beamforming is used to obtain the transmitted time function of the desired signal in certain incident angle. Then, time difference of arrival (TDOA) for the incident signals are mapped into phase shifts in the frequency domain. Using the DFT of the desired signal and the received data, we can separate the phase shifts in the frequency domain due to time delay by MUSIC-like searching. At the same time, the pairing of the estimated DOA and TDOA is automatically determined. Computer simulations illustrating the performance of the proposed algorithm with the Cramer-Rao bound are included.