基于非合作博弈的协同干扰物理层安全传输方法

Physical layer security transmission based on no-cooperation game

在基于非合作博弈的协同干扰物理层安全传输中,针对系统安全速率随干扰节点位置移动而剧烈下降的问题,提出一种对干扰信号进行波束成型与非合作博弈相结合的方法。首先使干扰信号在目的节点方向形成零陷,使目的节点接收到的干扰信号远远低于其他方向的干扰信号,从而减少目的节点受到的干扰。在此基础上采用斯坦伯格功率拍卖模型建立买卖双方的效用函数,通过分布式功率控制方法使得系统达到斯坦伯格均衡,并经过比较后选择合适的干扰节点和合适的干扰功率进行干扰,使得系统的效用达到最大,最后获得对应的安全速率。通过仿真验证,该方法能消除对干扰节点位置的限制,并且有效提高系统的安全速率,最高提高了0.1875 bit/s/Hz,最低提高了0.003 1 bit/s/Hz。

This paper investigated the physical layer security transmission based on no-cooperation game in the wireless communication network with multiple friendly jammers. Focused on the problem that the system secrecy capacity decreases with friendly jammers moving, a method that combined the beamforming technology and no-cooperation game was proposed.The beamforming technology was made use of to diminish the jamming signal to the destination node. On this basis, a power auction model was proposed, and utility functions of buyer and seller were built respectively. Then a distributed power control method was used to reach a Stackelberg type of equilibrium. And by choosing the proper jammer and jamming power, the maximal system utility and the corresponding secrecy capacity could be obtained. By simulation, this method can improve the system secrecy capacity with the maximum of 0. 187 5 bit/s/Hz and the minimum of 0. 003 1 bit/s/Hz; and the secrecy capacity stays unchanged with jammers moving.