Non-iterative subspace-based DOA estimation in the presence of nonuniform noise

Majdoddin Esfandiari, Sergiy A. Vorobyov*, Simin Alibani, Mahmood Karimi

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

35 Citations (Scopus)


The uniform white noise assumption is one of the basic assumptions in most of the existing direction-of-arrival (DOA) estimation methods. In many applications, however, the nonuniform white noise model is more adequate. Then, the noise variances at different sensors have to be also estimated as nuisance parameters while estimating DOAs. In this letter, different from the existing iterative methods that address the problem of nonuniform noise, a non-iterative two-phase subspace-based DOA estimation method is proposed. The first phase of the method is based on estimating the noise subspace via eigendecomposition (ED) of some properly designed matrix and it avoids estimating the noise covariance matrix. In the second phase, the results achieved in the first phase are used to estimate the noise covariance matrix, followed by estimating the noise subspace via generalized ED. Since the proposed method estimates DOAs in a non-iterative manner, it is computationally more efficient and has no convergence issues as compared to the existing methods. Simulation results demonstrate better performance of the proposed method as compared to other existing state-of-the-art methods.

Original languageEnglish
Article number8684312
Pages (from-to)848-852
Number of pages5
JournalIEEE Signal Processing Letters
Issue number6
Publication statusPublished - 1 Jun 2019
MoE publication typeA1 Journal article-refereed


  • Array processing
  • direction-of-arrival (DOA) estimation
  • nonuniform noise
  • spectral analysis
  • subspace-based methods


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