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Table 1 Computational complexity comparision per subblock for EM, ML, LCML, and SW detectors

From: A novel detector based on EM algorithm for multiple-mode OFDM with index modulation

DetectorComplexity
EM\( \mathcal {O}({\bar i}nM n!) \)
ML\( \mathcal {O}(n!M^{n}) \)
LCML\( \mathcal {O}(Mn^{2} + n!) \)
SW\( \mathcal {O}(Mn^{2}/2 + Mn/2) \)