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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 H (%) Reduction of computational complexity compared to QR decomposition with H (%)
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