Table 3 The average number of searches (\( \overline{\alpha} \)) for different schemes
From: Pilot allocation scheme based on coalition game for TDD massive MIMO systems
| Â | Different combining schemes | ||
|---|---|---|---|
MMSE | ZFC | MRC | |
Coalition game for different utility function | |||
 MSE-SD | 36.1 | 35.2 | 34.2 |
 Received SINR | 36.5 | 35.8 | 34.2 |
 SE | 36.5 | 35.8 | 34.2 |
 MSE-CE | 24 (without combining schemes) | ||
Random coalition | 0 (for all combining schemes) | ||
Greedy approach in [15] | |||
 MSE-CE | 12 (for MMSE combining scheme) | ||