Two-Dimensional DOA Estimation Using Arbitrary Arrays for Massive MIMO Systems

Figure 2

2D FDLS MUSIC spectrum for MIMO in different antenna configurations.

(a) 64 × 4 configuration

(b) 4 × 64 configuration

(c) 32 × 8 configuration

(d) 8 × 32 configuration

(e) 16 × 16 configuration