能量收集型高斯窃听信道安全速率的优化
首发时间:2015-02-13
摘要:针对无线网络存在安全威胁和能量受限的问题,研究了基于ST协议的能量收集型高斯窃听信道的安全通信问题。首先,对系统安全速率最大化进行了研究;其次,为进一步提高安全速率,给出了协作抗干扰方案,并讨论了协作抗干扰方案提高安全速率的充要条件及安全速率的迭代优化算法;最后,给出了一种复杂度低的单协作抗干扰辅助端的选择方案。仿真结果表明:第一种优化方案明显提高了系统的安全速率;第二种协作抗干扰方案进一步提高了系统的安全速率且收敛速度较快;当原能量收集型高斯窃听信道无法进行安全通信时,协作抗干扰方案可在一定条件下保证系统的安全传输。
关键词: 高斯窃听信道 安全速率 协作抗干扰 ST协议 能量收集
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Optimization of Secrecy Rate for Energy Harvesting Gaussian Wiretap Channel
Abstract:Aimed at the problems of security threats and energy constrained in wireless networks, secure communication of energy harvesting Gaussian wiretap channel based on save-then-transmit (ST) protocol is studied. Firstly, the optimization of system secrecy rate is investegated. Next, to further improve system secrecy rate, a cooperative jamming (CJ) scheme is given. Besides, the sufficient and necessary conditions for the cooperative jamming scheme to achieve a higher secrecy rate are discussed. Then, an iterative optimization of the secrecy rate is studied. Finally, a low complexity selection scheme of single cooperative jammer is given. Numerical results show that the first optimization scheme obviously improves system secrecy rate. The second cooperative jamming scheme further enhances system secrecy rate and has fast convergence rate. When the original energy harvesting Gaussian wiretap channel cannot operate secure communication, the cooperative jamming scheme can guarantee secure communication in some conditions.
Keywords: Gaussian wiretap channel secrecy rate cooperative jamming ST protocol energy harvesting
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No.4631421103487814****
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