Physical layer secure communication against an eavesdropper with arbitrary number of eavesdropping antennas

US11483704B2 · kind B2 · utility

Assignees

• University of Electronic Science and Technology of China · CN
• Science & Technology Department of Sichuan Province · CN

Inventors

• Jie Tang · Ibaraki, JP
• Liang Chen · Fairfax, US
• Hong Wen · Taipei, TW
• Xinchen Xu · Chengdu, CN
• Huanhuan Song · Chengdu, CN
• Kaiyu Qin · Chengdu, CN

Key dates

• Filing date: Dec 27, 2020
• Grant date: Oct 25, 2022
• Expiry date: Apr 14, 2041

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04W12/122
• WIPO field: Digital communication
• WIPO sector: Electrical engineering

Abstract

A method for physical layer secure transmission against an arbitrary number of eavesdropping antennas includes: S1: communication between legitimate transmitter Alice and legitimate receiver Bob is confirmed; S2: Alice randomly generates a key bit bk with MS bits, maps the key bit bk into a key symbol K, and performs an XOR on the key bit bk and to-be-transmitted confidential information b to obtain an encrypted bits bs; S3: Bob transmits a pilot sequence to Alice, and Alice calculates a candidate precoding space W and transmits modulated symbol streams s=(s1, . . , sN) by using precoding W(e); S4: Bob measures received signal strength of each antenna, estimates the corresponding antenna vector e, inversely maps the vector e to obtain key symbols and key bits, and demodulates the received symbol streams in sequence at each activated antenna to obtain demodulated ciphertext bits; S5: Bob performs an XOR on observed key bits and the demodulated ciphertext bits to obtain the confidential information.