Abstract
In this paper, the secure communication based on the full-duplex (FD) device-to-device (D2D) in cellular networks is proposed. For the proposed scheme, the novel model is established, in which a D2D user is played as a relay operating in FD mode to assist in the secure transmission of uplink information. Considering that the D2D user as a relay is untrusted, D2D link rate maximization is formulated with the constraint of secrecy rate, which ensures the security of uplink cellular networks. To cope with the optimization problem, the optimal power allocation factors of the cellular user (CU) and the D2D user are jointly optimized. Firstly, by using the monotonicity of the objective function, the optimal solution of the power allocation factor at the D2D user can be obtained. Subsequently, the closed-form expression of the optimal power allocation factor at the CU is derived and verified that the solution is the global minimum point. Simulation results verify that the proposed scheme has better output performance than the conventional scheme.
Highlights
The increasing use of wireless devices has led to explosive growth in data traffic, so wireless spectrum resources are becoming increasingly scarce [1,2,3]
By using cooperative protocols, such as amplify and forward (AF), decode and forward (DF) and quantize and forward (QF), the cooperative D2D communication ensures reliable and effective information transmission [8,9], and reduces the performance degradation of the cellular user (CU) caused by the D2D users reusing the cellular networks spectrums
For the conventional HD scheme, we still consider that the D2D user as a relay is untrusted, but the D2D user is operated in HD mode to assist cellular uplink transmission while reusing the cellular spectrum to achieve D2D communication
Summary
The increasing use of wireless devices has led to explosive growth in data traffic, so wireless spectrum resources are becoming increasingly scarce [1,2,3]. By using cooperative protocols, such as amplify and forward (AF), decode and forward (DF) and quantize and forward (QF), the cooperative D2D communication ensures reliable and effective information transmission [8,9], and reduces the performance degradation of the CUs caused by the D2D users reusing the cellular networks spectrums. In [10], a two-way communication scheme between BS and CU in two time slots based on D2D assistance is proposed On this basis, considering the interference caused by the D2D reuse of cellular network resources, a superposition coding scheme [11] is proposed at the D2D transmitter and the power allocated to assist the downlink transmission of the cellular is minimized. Where nD2 ∼ CN(0, σ2) is the additive noise at D2
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