Evaluation of performance improvement of space selective modulation by increasing number of transmitting antennas
Evaluation of performance improvement of space selective modulation by increasing number of transmitting antennas
复制标题
通过增加发射天线数量来评估空间选择性调制的性能改进
DOI：
10.1587/comex.2019spl0023
复制
发表时间：
2020
影响因子：
0.3
通讯作者：
S. Ibi
中科院分区：
文献类型：
--
作者：
Daiki Fukushima;H. Sasaoka;H. Iwai;S. Ibi
作为一种物理层安全技术，提出了使用阵列天线的定向调制（DM）。该方法仅在阵列的预定艾德方向上就能正确重构调制信号。另一方面，空间选择性调制（SSM）被提出。SSM与DM具有相似的原理。该方法利用衰落特性，仅在特定的艾德空间而不是特定的艾德方向上正确地重构调制信号。最初提出的SSM使用三个或四个发射天线。然而，传播的可能性不是100%。因为调制信号是通过对SSM中的相位控制信道系数求和而形成的，所以取决于信道条件，可能不会形成所有星座点的符号。这就导致了信息安全传输的保密能力下降。在本文中，我们考虑通过增加天线的数量来解决这个问题。通过计算机模拟定量地评估了该方案的保密能力。结果证实了SSM的保密能力的整体性能的提高。
: As a physical layer security technique, directional modulation (DM) using an array antenna was proposed. By the method, modulated signal can be correctly reconstructed in only the pre-speci fi ed direction from the array. On the other hand, Space Selective Modulation (SSM) was proposed. SSM shares the similar principle to DM. Using the technique, modulated signal is correctly reconstructed in only the speci fi ed space, not the speci fi ed direction by utilizing fading characteristics. The originally proposed SSM uses three or four transmitting antennas. However, the transmissible probability is not 100%. Because a modulated signal is formed by summing up phase-controlled channel coe ffi cients in SSM, symbols of the all constellation points may not be formed depending on the channel conditions. It brings about a decrease in the secrecy capacity of the secure information transmission. In this paper, we consider solving the problem by increasing the number of antennas. We quantitatively evaluated the secrecy capacity by computer simulations. The results con fi rm the improvement of the total performance in the secrecy capacity of SSM.