[B-1-96] xMISC: A Novel Sparse Linear Array via Maximum Interelement Spacing Principle for DOA Estimation
キーワード：sparse linear array、direction-of-arrival estimation、degrees of freedom、mutual coupling、MISC array
This paper proposes an enhanced sparse array design via the maximum interelement spacing constraint principle (xMISC). The xMISC array is developed by filling the holes in the conventional improved MISC array (IMISC). First, the hole locations in the IMISC array are analyzed, then a simplified hole-filling strategy is proposed to recover the missing lags. Compared with the MISC and IMISC arrays, the xMISC array exhibits enhanced uniform degrees of freedom (uDOF) while maintaining relatively reduced mutual coupling. Besides, the xMISC retains a hole-free difference co-array. The closed-form expressions for sensor locations, weight functions, and achievable DOF are also derived in detail. Numerical examples validated the merits of the xMISC array.
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