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研究了由1个单天线的源节点、目的节点、窃听节点和1个多天线的中继节点组成的系统中,通过能量协作增强保密传输性能的问题.为提高保密速率,中继节点发送经过波束赋形的干扰信号来干扰窃听者.在中继能量供应受限的情况下,提出一种协作干扰与能量协作相结合的方案.源端在能量约束范围内采用能量转移的方式为中继提供用于发送干扰信号的能量.对能量转移量、能量转移时间和干扰信号波束赋形的优化问题进行了求解.仿真结果表明,在不消耗中继自身能量的条件下,与直接传输相比,能量协作和协作干扰方案能够显著提高系统的保密性能.
In the system consisting of one single antenna’s source node, destination node, eavesdropping node and one multi-antenna relay node, the problem of enhancing secure transmission performance by energy cooperation is studied.In order to improve the security rate, the relay node sends Beamforming interfering signals to intercept eavesdroppers.When the relay energy supply is limited, a scheme combining the cooperative interference with the energy cooperation is proposed.The source uses the energy transfer mode as the relay within the energy constraint And provides the energy for transmitting the interference signal.The optimization of the energy transfer amount, the energy transfer time and the beamforming of the interference signal are solved.The simulation results show that, compared with the direct transmission without consuming the energy of the relay itself , Energy cooperation and cooperative interference schemes can significantly improve the system’s confidentiality.