FDA通信中双字母输入在起伏双光信道上的保密性能
Secrecy Performance for Finite-Alphabet Inputs Over Fluctuating Two-Ray Channels in FDA Communications
摘要：
为了给实际的频率分集通信系统的设计提供参考，研究了在波动双射线（FTR）衰落信道下，采用有限字母输入的频率分集系统的保密性能。更具体地说，封闭形式的平均保密率（ASR）和保密中断概率（SOP）的表达式推导，而它们的正确性是通过数值模拟证实。此外，我们进行渐近分析，以量化高斯和有限字母表输入之间的保密性能差距，足够大的平均信噪比（SNR）的主信道。与基于高斯输入的研究相比，这封信侧重于揭示FDA系统属性的实际场景。
英文摘要：
To provide system design insights for practical communication systems equipped with the frequency diverse array (FDA), this paper investigates the secrecy performance of FDA systems exploiting finite-alphabet inputs over fluctuating two-ray (FTR) fading channels. More specifically, closed-form expressions for the average secrecy rate (ASR) and the secrecy outage probability (SOP) are derived, while their correctness is confirmed by numerical simulations. In addition, we perform asymptotic analysis to quantify the secrecy performance gap between Gaussian and finite-alphabet inputs, for a sufficiently large average signal-to-noise ratio (SNR) of the main channel. Compared with Gaussian inputs-based research, this letter focuses on practical scenarios which sheds lights on properties of FDA systems.
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