Physical-layer security has become widely recognized as a promising technique to enhance wireless security by exploiting the characteristics including fading, noise, and interference. This letter explores an opportunity to enhance physical-layer security by balancing the power expense between pilot and payload signals without any prior knowledge related to eavesdroppers. In lieu of presuming perfect channel acquisition, we consider a practical wiretap channel with the receivers enabled by pilot-aided channel estimation (CE). The problem is tackled by accounting for the network interference from cochannel interferers in unknown locations by which the secrecy level is significantly affected. Specifically, the secrecy transmission rate (STR) reflecting the CE errors is derived for the worst-case within the use of a protected zone. We investigate the feasible region of pilot and data power allocation under reliability and secrecy constraints, and the optimal power allocation for pilot and data to maximize the STR is proposed, whose performance is verified via simulations.

中文翻译：

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具有物理层安全保护区的Poisson干扰场中的先导和数据功率分配

物理层安全性已被广泛认为是通过利用包括衰落，噪声和干扰在内的特性来增强无线安全性的有前途的技术。这封信探索了通过平衡导频信号和有效载荷信号之间的功率消耗而无需任何与窃听者有关的先验知识来增强物理层安全性的机会。代替假定完美的信道获取，我们考虑了一种实际的窃听信道，其接收器由导频辅助信道估计（CE）启用。通过考虑来自未知位置的同信道干扰源的网络干扰来解决此问题，秘密级别受到该干扰的影响很大。具体来说，在使用保护区的最坏情况下，得出反映CE错误的保密传输速率（STR）。