Macrocell Protection Interference Alignment in Two-Tier Downlink Heterogeneous Networks

Table 1

Computational complexity of MCP-IA and ILMA.

Scheme	Step	Operation	FLOPs	MIMO
MCP-IA	Compute	SVD with only and [26, 27]		1024
	Compute	SVD with , , and [26, 27]		2624
	Compute	Matrix multiplication [26]		112
		SVD with only and		1024
	Compute	Matrix multiplication		96
		Matrix inversion [27, 28]		84
Iteration			1	1
Total FLOPs				4964
ILMA	Compute	Matrix multiplication		32
	Compute	Eigenvalue decomposition [26, 27]		213
	Compute	Matrix multiplication		128
	Compute	Eigenvalue decomposition		1706
Iteration			Convergence is required	70 (average)
Total FLOPs				145530