From: A new pilot assignment scheme for mitigating pilot contamination in uplink massive multi-input–multi-output (MIMO) systems
Algorithm
Order of complexity
TS-PA
\(\mathcal{O}(L{K}^{3})\)
GATS-PA
\(\mathcal{O}\left(PL{K}^{3}\right)+\mathcal{O}\left(PL{K}^{2}\right), T=K\)
EX-PA
\(\mathcal{O}({K!}^{L-1})\)