From: A decentralized spectrum allocation and partitioning scheme for a two-tier macro-femtocell network with downlink beamforming
N b
θ m
g m
g s
Ψ m , Ψ f (dB)
1
2Ï€
0.00
4
Ï€/ 2
9.84
-30.00
6.02
8
Ï€/ 4
18.37
9.03