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Direction-of-Arrival Estimation with Coarray ESPRIT for Coprime Array.

Chengwei Zhou1, Jinfang Zhou2

  • 1College of Information Science and Electronic Engineering, Zhejiang University, Hangzhou 310027, China. zhouchw@zju.edu.cn.

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|August 4, 2017
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Summary
This summary is machine-generated.

This study introduces a novel coprime coarray ESPRIT algorithm for direction-of-arrival (DOA) estimation. It efficiently retrieves off-grid DOAs, overcoming limitations of existing methods by avoiding predefined grids and spectrum peak searches.

Keywords:
DOA estimationESPRITcoprime arrayoff-gridvirtual sensor

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Area of Science:

  • Signal Processing
  • Array Signal Processing
  • Electromagnetics

Background:

  • Coprime arrays offer superior degrees-of-freedom (DOF) for direction-of-arrival (DOA) estimation compared to uniform linear arrays.
  • Existing DOA estimation algorithms for coprime arrays often suffer from high computational complexity due to predefined spatial grids or spectrum peak searching.

Purpose of the Study:

  • To propose a novel, computationally efficient DOA estimation algorithm for coprime arrays.
  • To address the trade-off between estimation performance and computational complexity in existing methods.

Main Methods:

  • Introduction of Estimation of Signal Parameters via Rotational Invariance Techniques (ESPRIT) to the coprime coarray domain.
  • Derivation of coprime coarray statistics and extraction of shift-invariant uniform linear subarrays.
  • Investigation of signal subspace rotational invariance using the coprime coarray covariance matrix.

Main Results:

  • A closed-form solution for DOA estimation is formulated by incorporating ESPRIT in the coarray domain.
  • The proposed algorithm efficiently retrieves off-grid DOAs.
  • Demonstrated DOF superiority of the coprime coarray.

Conclusions:

  • The novel coarray ESPRIT-based DOA estimation algorithm is efficient and effective.
  • The method successfully overcomes the limitations of existing grid-based and peak-searching algorithms.
  • Validated through theoretical analysis and simulations, the algorithm offers improved DOA estimation for coprime arrays.