Multi-Dimensional Dual-Frequency Physical Layer Cross-Domain Fusion Secure Distribution Scheme

In this paper, a multi-dimensional dual-frequency physical layer cross-domain fusion secure distribution scheme is proposed. The scheme achieves physical isolation by using different frequencies to transmit encrypted data and key data within the W-band. The encrypted data is modulated using 16 quadrature amplitude modulation (QAM) to ensure information capacity, while the key is modulated using quadrature phase shift keying (QPSK) and interpolated to ensure reliable transmission. The overall system supports a data transmission rate of 20 Gb/s. Experimental results demonstrate that the encrypted data and the key can be transmitted and received simultaneously without crosstalk between them. This scheme can effectively prevent against brute attacks with the expanded key space of 10119, the bit error rate (BER) of the illegal user is above 0.4, while leveraging the W-band high-speed, high-capacity transmission to enhance communication system efficiency and performance, thereby enabling the development of secure communication.