An improved expanding and shift scheme for the construction of fourth-order difference co-arrays

• DOI: 10.1016/j.sigpro.2018.06.025
• Publication Date: 2018-07-06T10:52:39Z
• Authors: Jingjing Cai; Wei Liu; Ru Zong; Bin Wu
• Keywords: 0202 electrical engineering, electronic engineering, information engineering; 02 engineering and technology

An improved expanding and shift (IEAS) scheme for efficient fourth-order difference co-array construction is proposed. Similar to the previously proposed expanding and shift (EAS) scheme, it consists of two sparse sub-arrays, but one of them is modified and shifted according to a new rule. Examples are provided with the second sub-array being a two-level nested array (IEAS-NA), as such a choice can generate more fourth-order difference lags (FODLs), although with the same number of consecutive lags. Furthermore, the array aperture of IEAS-NA is always greater than the corresponding EAS structure, which helps improving the DOA estimation result. Simulations results are provided to show the improved performance by the proposed new scheme.