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文章针对有限字符输入下多输入单输出(MISO)窃听网络,推导了发射功率受限条件下系统的可达安全速率表达式。在已知理想信道状态信息的条件下,给出了最佳波束赋形向量所必须满足的条件,相应地设计了一种求解最佳波束赋形向量的迭代搜索算法。为了降低其计算复杂度,文章分析了低信噪比和高信噪比下系统可达安全速率的近似表达式,设计了相应的次佳波束赋形方案,并通过构建一个MISO窃听网络下的完整通信链路来检验所提方案的可靠性。仿真结果表明所提最佳波束赋形方案改善了系统的可达安全速率,恶化了窃听节点的误比特率性能,明显提升了系统的安全性能。
In this paper, aiming at the MISO eavesdropping network with finite characters input, the reachable secure rate expression of the system under the limited transmission power is deduced. Under the condition that the ideal channel state information is known, the conditions that must be satisfied for the best beamforming vector are given. An iterative search algorithm for solving the best beamforming vector is designed accordingly. In order to reduce its computational complexity, this paper analyzes the approximate expression of the system reachable secure rate under low signal-to-noise ratio and high signal-to-noise ratio and designs the corresponding sub-optimal beamforming scheme. By constructing a MISO eavesdropping network Complete communication link to test the reliability of the proposed solution. The simulation results show that the proposed optimal beamforming scheme improves the system reachability security rate, degrades the bit error rate performance of the eavesdropping node, and obviously improves the security performance of the system.