Secure Multi-Directional Independent Transmission Based on Directional Modulated 2D Conformal Phased Array.

Area of Science:

• Wireless communication
• Antenna theory
• Signal processing

Background:

• Directional Antenna Modulation (DAM) with 2D conformal phased arrays enables secure Multi-directional Independent Transmission (MIT).
• Existing methods face challenges in practical scenarios with receivers at varying distances, impacting efficiency.

Purpose of the Study:

• To propose an unbalanced DAM technique for enhanced transmission efficiency.
• To improve the security and angular coverage of multi-directional transmissions.
• To optimize phase delays for improved performance using an advanced algorithm.

Main Methods:

• Developed an unbalanced DAM technique with dynamic power allocation based on transmission distance.
• Integrated a Differential Evolution (DE) optimization algorithm with an "alien species invasion" mechanism.
• Analyzed Bit Error Rate (BER) for MIT using conformal and spherical sparse arrays.

Main Results:

• The unbalanced DAM technique significantly enhances transmission efficiency in practical scenarios.
• Superior directional security was achieved for MIT compared to traditional methods.
• Conformal arrays offer wider angular coverage, and sparse arrays overcome spacing limitations.
• Simulations validate simultaneous secure transmissions in multiple directions with BER below -40 dB.

Conclusions:

• The proposed unbalanced DAM technique improves efficiency and security for multi-directional transmissions.
• The optimized DE algorithm accelerates convergence and enhances phase delay optimization.
• The system demonstrates robust performance for secure, simultaneous multi-directional communication.