有限数量散射体对无线物理层安全的有益作用
On the Beneficial Role of a Finite Number of Scatterers for Wireless Physical Layer Security
摘要：
我们表明，合法的通信下的多径准静态衰落与散射体的数量减少，它是可能的，以实现完美的保密，即使在存在的被动窃听者，没有信道状态信息是可用的。具体而言，我们表明，中断概率的保密能力（OPSC）是零，在一个给定的范围内的平均信噪比（SNR）的合法和窃听的接收器。作为一个应用实例，我们分析了OPSC的情况下，两个散射体，明确推导出的平均信噪比，保密率$R_s$和衰落模型参数之间的关系，实现完美的秘密。增加散射体的数量的影响也进行了分析，表明它总是可以实现完美的保密在这种情况下，只要占主导地位的镜面分量的合法信道是足够大的剩余的散射波相比。
英文摘要：
We show that for a legitimate communication under multipath quasi-static fading with a reduced number of scatterers, it is possible to achieve perfect secrecy even in the presence of a passive eavesdropper for which no channel state information is available. Specifically, we show that the outage probability of secrecy capacity (OPSC) is zero for a given range of average signal-to-noise ratios (SNRs) at the legitimate and eavesdropper's receivers. As an application example, we analyze the OPSC for the case of two scatterers, explicitly deriving the relationship between the average SNRs, the secrecy rate $R_s$ and the fading model parameters required for achieving perfect secrecy. The impact of increasing the number of scatterers is also analyzed, showing that it is always possible to achieve perfect secrecy in this scenario, provided that the dominant specular component for the legitimate channel is sufficiently large compared to the remaining scattered waves.
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