Off-grid DoA estimation method of wideband signals

Yasoub Eghbali | Mahmoud Ferdosizade Naeiny

---

URL :   http://research.shahed.ac.ir/WSR/WebPages/Report/PaperView.aspx?PaperID=137697
Date :  2020/07/24
Publish in :    International Journal of Communication Systems
DOI :  https://doi.org/ https://doi.org/10.1002/dac.4466
Link :  http://dx.doi.org/ https://doi.org/10.1002/dac.4466
Keywords :direction of arrival (DoA), non-uniform linear array, off-grid, sparse representation

Abstract :

---

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.