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Table 3 Degrees of freedom of 2D- l 1 -SVD and l 1 -SVD

From: Decoupled 2D direction-of-arrival estimation based on sparse signal reconstruction

Methods

Degrees of freedom

 

Single snapshot

Multiple snapshots

l 1-SVD

M N/2

M N−1

2D- l 1-SVD- α

α

M/2

α

M−1

 

β for each α

N/2

β for each α

N−1

 

Maximum

M N/4

Maximum

(M−1)(N−1)

2D- l 1-SVD- β

β

N/2

β

N−1

 

α for each β

M/2

α for each β

M−1

 

Maximum

M N/4

Maximum

(M−1)(N−1)