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Table 2 Comparison of the implementation complexity

From: Massive MIMO signal transmission in spatially correlated channel environments

Beamforming FLOP
MRT K(6N T −1)
ZFBF [13] K{(24(K−1)N T 2+48(K−1)2 N T )+54(K−1)3}
IQRD [13] \(\begin {array}{l} 8\left ({3{N_{T}} - 1} \right) + \sum \limits _{i = 2}^{K - 1} \left ({i + 1} \right)\left \{8{N_{T}}\left [ {{N_{T}} - \left ({i - 1} \right)} \right ]\right.\\ ~~~~~~~~~~~~~~~~~~~~~~+ 4\left [ {3\left ({{N_{T}} - \left ({i - 1} \right)} \right) - 1} \right ]\\ \left.~~~~~~~~~~~~~~~~~~~~~~+ 8{N_{T}}\left [ {{N_{T}} - \left ({i - 1} \right)} \right ]\left ({{N_{T}} - i} \right)\right \} \end {array}\)
Proposed BF \(\begin {array}{l} K\left [ 2\left ({6{N_{T}} - 1} \right) + N\left (\left ({8{N_{T}} - 1} \right){N^{2}} + \left ({14{N_{T}} - 2} \right)N \right.\right.\\ \left.\left.~~~~~~~~~~~~~~~~~~~~~~~~~~~+ 18{N_{T}} + 8 \right)\right ] \end {array}\)