Open AccessSymbol separation and beamforming to improve secure transmission in multi‐untrusted relay networks
Author(s) -
Mekkawy Tamer,
Yao Rugui,
Zuo Xiaoya,
Wang Ling
Publication year - 2018
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
eISSN - 1350-911X
pISSN - 0013-5194
DOI - 10.1049/el.2017.3688
Subject(s) - beamforming , relay , correctness , computer science , transmission (telecommunications) , secure transmission , scheme (mathematics) , channel (broadcasting) , symbol (formal) , physical layer , computer network , electronic engineering , telecommunications , wireless , algorithm , engineering , power (physics) , mathematics , mathematical analysis , physics , quantum mechanics , programming language
In multi‐untrusted relay networks, the transmission should be carefully devised to guarantee both security and performance. A novel scheme with symbol separation and beamforming is proposed to improve secure transmission. First, the best two relays with the strongest channel gains are selected to deliver the separated real and imaginary parts of the confidential symbols. Then, directional beamforming is carefully designed to maximise the receptions of the real and imaginary parts at the two selected relays and to zero force the receptions at the other relays. The proposed scheme ensures a perfect physical layer security with high BER at untrusted relays, and an improved BER performance at the destination. Numerical simulations show the correctness and efficiency of the proposed scheme.