From: Multiple access interference in MIMO-CDMA systems under Rayleigh fading: statistical characterization and applications
MIMO system
2×2
3×3
4×4
K=4
3.77
4.28
4.63
K=10
3.30
3.90
4.02
K=15
3.18
3.80
3.94
K=20
3.14
3.71
3.83