Table 2 Numbers of complex-valued operations required for the ZF STBC decoder: a user is added to the system
From: Low computational complexity methods for decoding of STBC in the uplink of a massive MIMO system
Number of users (M) | 8 | 16 | 24 | 32 |
|---|---|---|---|---|
Direct inverse | 126822 | 396587 | 950683 | 1920182 |
Proposed update | 70180 | 178116 | 329060 | 523012 |
Complexity reduction (updating) | 45% | 55% | 65% | 72% |
Inverse approximation R = 3 | 51264 | 105536 | 168000 | 238656 |
Complexity reduction (approximation) | 60% | 73% | 82% | 87% |