To protect military broadcasting against both hostile interference and eavesdropping, an artificial noise (AN) sheltered frequency hopping (FH) broadcasting (ANS-FHB) architecture is proposed in this paper, and the secrecy capacity is employed to measure its secrecy performance. Besides, considering the inevitable frequency mismatch after synchronization will degrade system secrecy in practical applications, the optimal transmitting power allocation (PA) for the confidential information (CI) and AN is provided to maximize secrecy capacity in presence of frequency mismatch. Moreover, to be adapted to various application scenarios, the proposed optimal PA scheme is further simplified according to the frequency synchronization ability and relative channel quality. The analysis and simulations show that the proposed ANS-FHB system can achieve a non-negative secrecy rate even when existing multiple eavesdroppers. In addition, the optimal power ratio of AN to CI shows a downward trend from one to zero as frequency mismatch increases to mitigate the secrecy loss.

中文翻译：

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频率失配的人工噪声屏蔽跳频广播：保密分析和功率分配


为了保护军事广播免受敌意干扰和窃听，本文提出了一种人工噪声（AN）屏蔽跳频（FH）广播（ANS-FHB）架构，并采用保密容量来衡量其保密性能。此外，考虑到同步后不可避免的频率失配会降低实际应用中的系统保密性，提供了机密信息（CI）和AN的最佳发射功率分配（PA），以在频率失配的情况下最大化保密能力。此外，为了适应各种应用场景，根据频率同步能力和相对信道质量进一步简化了所提出的最优PA方案。分析和仿真表明，即使存在多个窃听者，所提出的ANS-FHB系统也能实现非负保密率。此外，随着频率失配的增加以减轻保密性损失，AN 与 CI 的最佳功率比呈现从 1 到 0 的下降趋势。