From: Low storage space for compressive sensing: semi-tensor product approach
M
t = 1
t = 2
t = 4
32
Φ 32×256
Φ 16×128
Φ 8×64
64
Φ 64×256
Φ 32×128
Φ 16×64
128
Φ 128×256
Φ 64×128
Φ 32×64