National Key Laboratory of Science and Technology on Communications, University of Electronic Science and Technology of China (UESTC), Chengdu 611731, China.
China Academy of Space Technology (CAST), Beijing 100192, China.
Sensors (Basel). 2022 Mar 31;22(7):2676. doi: 10.3390/s22072676.
Recently, a frequency diverse array (FDA) has been employed in an orthogonal frequency division multiplexing (OFDM) transmitter to achieve secure wireless communication without mathematical encryption. However, an insecure coupling effect arises if the frequency increments are linearly assigned to all antenna elements. To solve this problem, random subcarrier-selection methods are proposed; however, the challenge lies in the random selection of subcarriers. Inspired by the randomness of index modulation (IM), this paper proposes a low complexity random subcarrier-selection method based on index modulation (RSCS-IM). Specifically, this work conducted analysis on the spectral efficiency (SE) of our system and the computational complexity of RSCS-IM, which works out a closed-form expression of the BER performance of a desired position and validates the theoretical outcomes through simulation.
最近，一种频率分集阵列（FDA）已被应用于正交频分复用（OFDM）发射机中，以实现无需数学加密的安全无线通信。然而，如果将频率增量线性分配给所有天线元件，则会出现不安全的耦合效应。为了解决这个问题，提出了随机子载波选择方法；但是，挑战在于子载波的随机选择。受索引调制（IM）随机性的启发，本文提出了一种基于索引调制（IM）的低复杂度随机子载波选择方法（RSCS-IM）。具体来说，这项工作对我们系统的频谱效率（SE）和 RSCS-IM 的计算复杂度进行了分析，得出了期望位置 BER 性能的闭式表达式，并通过仿真验证了理论结果。
