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Off‐grid DoA estimation method of wideband signals
Author(s) -
Eghbali Yasoub,
Ferdosizade Naeiny Mahmoud
Publication year - 2020
Publication title -
international journal of communication systems
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.344
H-Index - 49
eISSN - 1099-1131
pISSN - 1074-5351
DOI - 10.1002/dac.4466
Subject(s) - computer science , covariance matrix , wideband , algorithm , grid , direction of arrival , covariance , range (aeronautics) , matrix (chemical analysis) , mathematics , telecommunications , statistics , electronic engineering , antenna (radio) , materials science , geometry , engineering , composite material
Summary In this paper, an off‐grid direction of arrival (DoA) estimation method is proposed for wideband signals. This method is based on the sparse representation (SR) of the array covariance matrix. Similar to the time domain DoA estimation methods, the correlation function of the sources was assumed to be the same and known. A new measurement vector is obtained using the lower‐left triangular elements of the covariance matrix. The DoAs are estimated by quantizing the entire range of continuous angle space into discrete grid points. However, the exact DoAs may be located between two grid points; therefore, this estimation has errors. The accuracy of DoA estimation is improved by the minimization of the difference between the new measurement vector and its estimated values. Simulation results revealed that the proposed method can enhance the DoA estimation accuracy of wideband signals.