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arXiv 1702.01386cs.ITmath.IT
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多源多传感器联合DOA和欠采样频率估计

Joint DOA and Frequency Estimation with Sub-Nyquist Sampling for More Sources than Sensors

Liang Liu, Ping Wei

摘要:

在这封信中,我们应用以前的阵列接收机架构,采用时域欠采样技术,联合估计频率和到达方向(DOA)的窄带远场信号。在此,考虑更一般的情况,其中在子带中可以存在多于一个信号。建立了时空联合模型,分析了该模型的辨识性,并给出了可辨识的最大信号个数。我们还证明了Cramer-Rao界(CRB)低于采用Nyquist采样。仿真结果验证了该方法估计信源个数的能力。同时,仿真结果表明,我们的估计性能密切匹配的CRB,是优于更多的源比传感器,特别是当最小冗余阵列(MRA)。

英文摘要:

In this letter, we apply previous array receiver architecture which employs time-domain sub-Nyquist sampling techniques to jointly estimate frequency and direction-of-arrival(DOA) of narrowband far-field signals. Herein, a more general situation is taken into consideration, where there may be more than one signal in a subband. We build time-space union model, analyze the identification of the model, and give the maximum signal number which can be classified. We also proof that the Cramer-Rao Bound (CRB) is lower than that of which employs Nyquist sampling. Simulation results verify the capacity to estimate the number of sources. Meanwhile, simulations show that our estimation performance closely matches the CRB and is superior for more sources than sensors, especially when the minimum redundancy array (MRA) is employed.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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