Secure OFDM with Peak-to-Average Power Ratio Reduction Using the Spectral Phase of Chaotic Signals.

Area of Science:

• Electrical Engineering
• Information Security
• Telecommunications

Background:

• Orthogonal Frequency Division Multiplexing (OFDM) systems face challenges with Peak to Average Power Ratio (PAPR) and inherent security vulnerabilities.
• Physical layer security offers a promising approach to enhance communication security at the transmission level.

Purpose of the Study:

• To propose a novel physical layer security technique for OFDM systems.
• To simultaneously address the Peak to Average Power Ratio (PAPR) issue in OFDM systems.
• To leverage chaotic sequences for enhanced security and PAPR reduction.

Main Methods:

• Modifying OFDM symbols using the phase information of chaos in the frequency spectrum.
• Employing the Selected Mapping (SLM) technique with chaotic sequences for PAPR reduction.
• Utilizing the initial conditions of chaotic generators as cryptographic keys.

Main Results:

• The proposed technique achieves physical layer security by exploiting the noise-like behavior and initial condition sensitivity of chaotic sequences.
• PAPR reduction comparable to existing SLM schemes is achieved.
• The method offers lower computational complexity and eliminates the need to transmit side information to the receiver.

Conclusions:

• The developed chaotic sequence-based technique provides a robust and efficient solution for enhancing OFDM system security.
• The dual benefit of improved security and PAPR reduction makes this technique highly valuable for practical OFDM applications.
• The key-dependent nature of chaotic sequences ensures strong cryptographic security against eavesdropping.