Table 2 Reduction of computational complexity for ZF, MMSE and QR decomposition compared to LC-QR decomposition detection mechanisms
From: A low computational complexity V-BLAST/STBC detection mechanism in MIMO system
Complex arithmetic operation | Reduction of computational complexity compared to ZF and MMSE with(%) | Reduction of computational complexity compared to QR decomposition with(%) | ||||||
|---|---|---|---|---|---|---|---|---|
M = 4 | M = 5 | M = 4 | M = 5 | |||||
N = 4 | N = 5 | N = 5 | N = 6 | N = 4 | N = 5 | N = 5 | N = 6 | |
Addition | 93.2 | 92.2 | 94.0 | 94.1 | 17.3 | 17.2 | 21.5 | 21.1 |
Subtraction | - | - | - | - | - | - | - | - |
Multiplication | 89.7 | 90.3 | 92.7 | 93.0 | - | - | 8.3 | 8.1 |
Division | - | - | - | - | 33.3 | 33.3 | 25.0 | 25.0 |
Householder reflection | - | - | - | - | 80.6 | 79.9 | 82.1 | 81.8 |
Gaussian elimination | - | - | - | - | - | - | - | - |
Total | 87.9 | 87.7 | 90.9 | 90.7 | 51.5 | 53.0 | 59.3 | 60.5 |