论文标题
建立具有随机频率不同阵列的定向调制方案的保密区
Establishing Secrecy Region for Directional Modulation Scheme with Random Frequency Diverse Array
论文作者
论文摘要
在安全通信中提出了基于随机频率的不同阵列（RFDA）定向调制（DM），以实现机密信息的精确传输，而人工噪声（AN）被视为RFDA-DM中的重要助手。与以前仅关注所需接收器位置的工作相比，在这项工作中，我们研究了所需接收器周围的秘密区域，即所需接收器周围的特定范围和角度分辨率。首先，得出了实现保密区域所需的最小天线和带宽。此外，根据RFDA-DM-AN计划的保密能力的下限，我们研究了保密能力的绩效影响。从这项工作中，我们得出结论：1）一个并不总是对安全传输有益。具体而言，当天线的数量足够大，发射功率小于指定值时，由于消耗有限的发射功率，会降低保密能力。 2）增加的带宽将扩大该集合以随机分配频率，从而导致更高的保密能力。 3）随着预定义的保密传输速率的增加，天线的最小数量增加。
Random frequency diverse array (RFDA) based directional modulation (DM) was proposed as a promising technology in secure communications to achieve a precise transmission of confidential messages, and artificial noise (AN) was considered as an important helper in RFDA-DM. Compared with previous works that only focus on the spot of the desired receiver, in this work, we investigate a secrecy region around the desired receiver, that is, a specific range and angle resolution around the desired receiver. Firstly, the minimum number of antennas and the bandwidth needed to achieve a secrecy region are derived. Moreover, based on the lower bound of the secrecy capacity in RFDA-DM-AN scheme, we investigate the performance impact of AN on the secrecy capacity. From this work, we conclude that: 1) AN is not always beneficial to the secure transmission. Specifically, when the number of antennas is sufficiently large and the transmit power is smaller than a specified value, AN will reduce secrecy capacity due to the consumption of limited transmit power. 2) Increasing bandwidth will enlarge the set for randomly allocating frequencies and thus lead to a higher secrecy capacity. 3) The minimum number of antennas increases as the predefined secrecy transmission rate increases.
