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Designi an Adaptive Beamforming Algorithm, Robust Against Direction-of-Arrival Mismatch

Rahmani, Mostafa | 2012

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 44230 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Bastani, Mohammad Hasan
  7. Abstract:
  8. Adaptive beamforming performance is very sensitive to any mismatch between actual and presumed steering vectors of desired signal. In addition to this sensitivity, presence of desired signal in training snapshots dramatically reduces the convergence rate, as compared to the case that signal-free training snapshots are available.
    The present work is aimed at proposing a new adaptive beamformer that is robust against direction-of-arrival (DOA) mismatch and has high convergence rate. This method is based on desired signal elimination from training snapshots and sub-array beamforming technique. To this end, a Blocking matrix that converts primary data to desired signal free data is synthesized. The Synthesis process is based on desired degree of freedom and uncertainty of DOA of desired signal. Using the signal-free data, the weight vector (beamforming vector) is calculated through the presented algorithm. Due to elimination of desired signal from training snapshots and performing adaptive operations in the sub-array level, our algorithm has high convergence rate and excellent performance even in cases with small sample size. Numerical examples show that this method has excellent Signal-to-Interference-plus-Noise Ratio (SINR) performance and offers a higher convergence rate, compared to that of existing robust adaptive beamforming algorithms
  9. Keywords:
  10. Robust Algorithm ; Array Signal Processing ; Adaptive Beamforming Algorithm ; Desired Signal Direction-of-Arrival (DOA)Mismatch

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