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Table 1 Chaos-based communication systems comparison

From: A new scheme to enhance the performance of permutation index–differential chaos shift keying communications system

System Energy saving Spectral efficiency Security level Reference signal required Permutation required Mode of bit transmission for each reference signal
SR-PI-DCSK High High High No Yes Multiple
DCSK No Low Low Yes No Single
CDSK No Low Moderate Yes No Single
HE-DCSK Moderate Low Moderate Yes No Dual
TR-DCSK Moderate Moderate Moderate Yes Yes Single