Joint Encryption Scheme Based on the Chaotic DCT Matrix and SLM Algorithm in an OFDM-PON System

Table 1

The comparative analysis among our scheme and other preprocessing matrix schemes.

Scheme	Complexity	PAPR reduction	Key space
WHT [11]	L
CAZAC [13]	M
DFT [14]	H
Our	H

WHT: Walsh–Hadamard transform; CAZAC: constant envelope zero autocorrelation; DFT: discrete Fourier transform; L: low; H: high; M: medium.