Direction of Arrival Estimation and Digital Beamforming in the Presence of Mutual Coupling Effects and Implementation

Emadi, Mohammad | 2013

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 43995 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Haj Sadeghi, Khosrow
  7. Abstract:
  8. Different beamforming methods are prevalent in wireless and mobile communication systems. However, a lot of practical issues, such as the quality of these methods in compact arrays and the huge computational burden are the major defects of the proposed methods. These problems restrict most of the algorithms to the theoretical domain and render them anappropriate for commercial applications. Therefore, the major focus of this thesis is on the practical issues in the implementation of the digital beam steering and direction of arrival estimation systems for linear, circular and random array configurations. To do so, compact arrays with super directivity are presented and considered. Different methods for mutual coupling compensation in these arrays are scrutinized, and based on the iteration methods; a new iterative algorithm for null steering is presented. In addition, a new method for finding the direction of arrival of a known signal in the presence of multipath effect with a small computational burden is proposed. Furthermore, for applications with very low available computational resources, a new method based on sparse signal processing is introduced and compared with other conventional algorithms. All the presented methods could be implemented in the commonplace hardware proposed in the final part of this thesis
  9. Keywords:
  10. Mutual Coupling ; Smart Antenna System ; Beamforming ; Null Steering ; Direction of Arrival (DOA)Estimation

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