Symbol separation and beamforming to improve secure transmission in multi‐untrusted relay networks

Abstract

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. JCYJ20170306155652174), the Aerospace Science and Technology Fund (no. 2017-HT-XG) and the Fundamental Research Funds for the Central Universities [no. 3102017JG02002, 3102017HQZZ016 and 3102015BJ(II)ZS023].

Secure transmission for IoT wireless energy-carrying communication systems

“…The results demonstrate that secure image-based transmission is accomplished by the suggested two-layer chaotic scrambling approach. According to the literature [ 18 ], the transmission should be meticulously planned to guarantee security and effectiveness in a multi-untrusted relay network. To enhance secure communication, a novel technique with symbol separation and beamforming is suggested.…”