'Institute of Electrical and Electronics Engineers (IEEE)'
Doi
Abstract
To reach a higher number of degrees of freedom by exploiting the
fourth-order difference co-array concept, an effective structure extension
based on two-level nested arrays is proposed. It increases
the number of consecutive lags in the fourth-order difference coarray,
and a virtual uniform linear array (ULA) with more sensors
and a larger aperture is then generated from the proposed structure,
leading to a much higher number of distinguishable sources with
a higher accuracy. Compressive sensing based approach is applied
for direction-of-arrival (DOA) estimation by vectorizing the fourthorder
cumulant matrix of the array, assuming non-Gaussian impinging
signals
