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The weighted least-squares (WLS) direction-of-arrival estimator that minimizes an error based on interchannel phase differences is both computationally simple and flexible. However, the approach has several limitations, including an inability to cope with spatial aliasing and a sensitivity to phase wrapping. The recently proposed phase wrapping robust (PWR)-WLS estimator addresses the latter of these issues, but requires solving a nonconvex optimization problem. In this contribution, we focus on both of the described shortcomings. First, a conceptually simpler alternative to PWR is presented that performs comparably given a good initial estimate. This newly proposed method relies on an unwrapping of the phase differences vector. Secondly, it is demonstrated that all microphone pairs can be utilized at all frequencies with both estimators. When incorporating information from other frequency bins, this permits a localization above the spatial aliasing frequency of the array. Experimental results show that a considerable performance improvement is possible, particularly for arrays with a large microphone spacing.
Keywords
sound source localization, direction-of-arrival, least-squares, phase wrapping, spatial aliasing

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MLA
Bohlender, Alexander, et al. “Least Squares DOA Estimation with an Informed Phase Unwrapping and Full Bandwidth Robustness.” ICASSP 2020 - 2020 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), IEEE, 2020, pp. 4841–45, doi:10.1109/ICASSP40776.2020.9053359.
APA
Bohlender, A., Spriet, A., Tirry, W., & Madhu, N. (2020). Least squares DOA estimation with an informed phase unwrapping and full bandwidth robustness. In ICASSP 2020 - 2020 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) (pp. 4841–4845). New York: IEEE. https://doi.org/10.1109/ICASSP40776.2020.9053359
Chicago author-date
Bohlender, Alexander, A. Spriet, W. Tirry, and Nilesh Madhu. 2020. “Least Squares DOA Estimation with an Informed Phase Unwrapping and Full Bandwidth Robustness.” In ICASSP 2020 - 2020 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), 4841–45. New York: IEEE. https://doi.org/10.1109/ICASSP40776.2020.9053359.
Chicago author-date (all authors)
Bohlender, Alexander, A. Spriet, W. Tirry, and Nilesh Madhu. 2020. “Least Squares DOA Estimation with an Informed Phase Unwrapping and Full Bandwidth Robustness.” In ICASSP 2020 - 2020 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), 4841–4845. New York: IEEE. doi:10.1109/ICASSP40776.2020.9053359.
Vancouver
1.
Bohlender A, Spriet A, Tirry W, Madhu N. Least squares DOA estimation with an informed phase unwrapping and full bandwidth robustness. In: ICASSP 2020 - 2020 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP). New York: IEEE; 2020. p. 4841–5.
IEEE
[1]
A. Bohlender, A. Spriet, W. Tirry, and N. Madhu, “Least squares DOA estimation with an informed phase unwrapping and full bandwidth robustness,” in ICASSP 2020 - 2020 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), Barcelona, Spain, 2020, pp. 4841–4845.
@inproceedings{8662369,
  abstract     = {{The weighted least-squares (WLS) direction-of-arrival estimator that minimizes an error based on interchannel phase differences is both computationally simple and flexible. However, the approach has several limitations, including an inability to cope with spatial aliasing and a sensitivity to phase wrapping. The recently proposed phase wrapping robust (PWR)-WLS estimator addresses the latter of these issues, but requires solving a nonconvex optimization problem. In this contribution, we focus on both of the described shortcomings. First, a conceptually simpler alternative to PWR is presented that performs comparably given a good initial estimate. This newly proposed method relies on an unwrapping of the phase differences vector. Secondly, it is demonstrated that all microphone pairs can be utilized at all frequencies with both estimators. When incorporating information from other frequency bins, this permits a localization above the spatial aliasing frequency of the array. Experimental results show that a considerable performance improvement is possible, particularly for arrays with a large microphone spacing.}},
  author       = {{Bohlender, Alexander and Spriet, A. and Tirry, W. and Madhu, Nilesh}},
  booktitle    = {{ICASSP 2020 - 2020 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)}},
  isbn         = {{9781509066315}},
  issn         = {{1520-6149}},
  keywords     = {{sound source localization,direction-of-arrival,least-squares,phase wrapping,spatial aliasing}},
  language     = {{eng}},
  location     = {{Barcelona, Spain}},
  pages        = {{4841--4845}},
  publisher    = {{IEEE}},
  title        = {{Least squares DOA estimation with an informed phase unwrapping and full bandwidth robustness}},
  url          = {{http://dx.doi.org/10.1109/ICASSP40776.2020.9053359}},
  year         = {{2020}},
}

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