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。本文针对多输入单输出(MISO)的窃听信道和主信道,以最大化安全容量为多用户调度准则,采用波束形成(BF)方案,对多用户下行链路的物理层安全问题进行了研究,推导出在已知不完备和完备的信道状态信息(CSI)情形下的安全中断概率的闭合表达式以及在高信噪比下(SNR)安全中断概率的渐进结果,此外还得出非0安全容量概率的闭合表达式。结果表明,不完备CSI下分集增益为K,在完备CSI下分集增益为K×Ns,并且与蒙特卡洛仿真结果相匹配。
. In this paper, the multi-user input / output (MISO) eavesdropping channel and main channel are used to maximize the security capacity as the multi-user scheduling criterion and the beamforming (BF) scheme is used to study the physical layer security of multi- The closed-form expression of the safety outage probability under the condition of known incomplete and complete channel state information (CSI) and the asymptotic result of the probability of safety outage under the high signal-to-noise ratio (SNR) are deduced. Closed expression of probability of capacity. The results show that the diversity gain under incomplete CSI is K, the diversity gain under complete CSI is K × Ns, and it matches with Monte Carlo simulation results.