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Performance Analysis of a Novel Antenna Array Calibration Approach for Direction Finding Systems
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DoA estimation in multipath channels for packet transmission communication systems
No full textThis manuscript deals with the problem of direction of arrival (DoA) in multipath wireless channels with a line-of-sight (LOS) component. A cyclic prefixing (CP) orthogonal frequency division multiplexing (OFDM) transmission technique is herein considered to show how the proposed methodology can be easily integrated into a data transmission system. The method basically consists of three steps: a frame synchronization and a channel estimation (which are shared with the data processing path), and finally the DoA estimation. The proposed procedure is general and does not rely on a particular synchronization mechanism or a specific channel estimation algorithm. A comparison between the use of two different DoA estimation methodologies (a low complexity DoA estimator applied to the first arrival path and a super-resolution algorithm using smooth-MUSIC) is described in this work to serve as a guideline for the appropriate method selection according to the specific application requirements
Characterization of Hardware Impairments in Multiple Antenna Systems for DoA Estimation
Full text linkWe consider the effects introduced by hardware impairments on the estimation of the direction of arrival (DoA) deploying a multiple antenna radio system. We derive a system model from experimental measurements of a state-of-the-art hardware test bed based on an RF direct-conversion architecture. The system model includes DC offsets, carrier frequency and phase offsets, and the phase noise. Then, we propose a simple digital compensation algorithm of the impairments for bidimensional DoA estimation (azimuth and elevation) with a 3D orthogonal linear array. The robustness of the algorithm in terms of minimum-mean-squared error as a function of the hardware impairments is evaluated and compared with that achieved using the root-MUSIC algorithm
Low Complexity AoA Estimation with Planar Electromagnetic Lens Arrays
No full textThis paper describes the problem of angle of arrival (AoA) estimation with planar electromagnetic (EM) lens arrays. Planar EM lens arrays exhibit some implementation advantages if compared with dielectric lenses such as light weight and low cost, making them a very attractive solution for different applications. Although several AoA estimation algorithms and methods have been recently proposed, most part of the literature does not deal with the case of planar lens, and an analysis of EM lens array signal models reveals the impossibility to apply methodologies developed for other kind of EM lenses to this case. Therefore, this work develops novel algorithms for AoA estimation with planar EM lens arrays. Moreover, the proposed methods not only have a very low computational complexity, but also employ only signal energies, leading to a great implementation simplification. Numerical results are also shown to demonstrate the accuracy of the proposed methods
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