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Table 1 Complexity comparison

From: A simple block diagonal precoding for multi-user MIMO broadcast channels

Method

Computational complexity

SVD-BD

6 K 9 K 1 N k 3 + 8 K 1 N k 2 N T + 4 K 1 N k N T 2

8KN k N T (N T  − (K − 1)N k )

6 K 9 N k 3 + 8 N k 2 N T K 1 N k + 4 N k N T K 1 N K 2

2K2N k 2 + 6KN k

K N k + 2 K N k 2 + 8 K N T N T K 1 N k N k

QR-BD

12 K K 1 2 N k 2 N T K 1 N k / 3

8KN k N T (N T  − (K − 1)N k )

6 K 9 N k 3 + 8 N k 2 N T K 1 N k + 4 N k N T K 1 N k 2

2K2N k 2 + 6KN k

 

K N k + 2 K N k 2 + 8 K N T N T K 1 N k N k