Large-Scale Multicast Group Secure Transmission Scheme Based on Multi-Carrier FDA

Area of Science:

• Wireless Communication
• Information Security
• Signal Processing

Background:

• Traditional physical layer technologies struggle with secure transmission in large-scale, dispersed multicast systems.
• Increasing numbers of users and wide dispersion pose significant challenges to secure multicast communication.
• Existing methods lack the capability to differentiate users with similar direction angles but different distances.

Purpose of the Study:

• To propose a novel layered transmission method for secure physical layer communication in multicast systems.
• To design a scheme that addresses the security challenges posed by a large number of users and wide dispersion.
• To enable secure communication for users with varying distances within the same direction, ensuring mutual non-interference.

Main Methods:

• Establishment of a hierarchical transmission system model.
• Optimization of array weighted vectors to maximize artificial noise interference power.
• Implementation of a multicast grouping strategy using singular value decomposition and Lagrange multiplier algorithms for user groups larger than the number of antennas.

Main Results:

• The proposed method successfully achieves secure communication for users at different distances but in the same direction.
• The system can effectively distinguish multicast users with the same direction angle but different distances.
• Demonstrated secure communication for large-scale multicast users under the premise of mutual non-interference.

Conclusions:

• The layered transmission method enhances physical layer security in large-scale multicast systems.
• The proposed scheme effectively overcomes the limitations of traditional methods in handling user dispersion and number.
• This approach provides a robust solution for secure multicast communication, enabling differentiated access and non-interference.