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Evaluation and Improvement of DOA Estimation Methods in Dipole Antenna Arrays with Different Geometries

Sasannia, Zahra | 2016

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 48664 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Farzaneh, Forouhar
  7. Abstract:
  8. In this thesis, some of the well-known DOA algorithms namely Bartlett, Capon, Linear prediction, Maximum Entropy, Pisarenko harmonic decomposition, Minimum norm and MUSIC are analyzed and compared with each other in the identical situations using a uniform linear array. Then based on these comparisons, the appropriate algorithm is selected. In the next step since the linear arrays can't estimate both angles of arrival (Azimuth and Elevation) simultaneously, two dimensional (2D) geometries are introduced and are also compared to each other. Then one of them (circular array) is selected for dipole antenna arrays. The performance of the selected array is evaluated using isotropic elements for estimating azimuth and azimuth/elevation angles of arrival. This evaluation is performed by the selected DOA algorithm in an environment with several signal sources and in presence of white Gaussian noise. The simulation results are compared in different scenarios (in terms of the number of elements, the number of snapshots and the signal to noise ratio). In addition, this 2D geometry is upgraded to a three dimensional (3D) geometry in order to improve the resolution of DOA estimation. These geometries and DOA algorithms are mainly used in 1-2 GHz and 3-4 GHz bands and they will be applicable in smart antennas in wireless communications. Finally, the mutual coupling effect (non-ideal arrays) is considered and its effect is estimated in one, two and three dimensional arrays
  9. Keywords:
  10. Smart Antenna System ; Mutual Coupling ; Wireless Communication ; Direction of Arrival (DOA)Estimation ; Direction of Arrival (DOA) Algorithms ; Dipole Antenna Arrays

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