基于凸优化的稀疏阵列方向调制信号综合算法研究

发布时间：2018-01-04 16:44

本文关键词：基于凸优化的稀疏阵列方向调制信号综合算法研究　出处：《电子与信息学报》2017年11期 　论文类型：期刊论文

【摘要】：方向调制技术利用多天线发射阵列的空间调制能力在天线端综合出具有方向特性的数字调制信号是近年来物理层安全通信领域研究的热点之一。该文提出一种基于凸优化的稀疏阵列方向调制信号综合算法。首先算法建立以阵列稀疏为目标函数以及方向调制信号不同性能要求为约束的非凸优化问题;然后针对这个非凸问题,给出了两种不同的求解方案:一种基于迭代加权1?算法,但稀疏算法得到的结果可能存在阵元间距小于半个波长的情况;另一种基于混合整数规划,确保稀疏算法得到的阵元间距至少为半个波长;最后在混合整数规划算法的基础上建立以方向调制信号功率利用率为目标的优化问题,优化稀疏阵列方向调制信号发射机的功率利用率。仿真结果表明,相比于与现有的基于均匀等间距直线阵列的方向调制信号综合算法,所提算法在方向调制信号的安全性能、方向调制信号发射机的功率利用率以及阵列的稀疏程度之间具有良好的设计灵活度。
[Abstract]:Directional modulation technology using the spatial modulation capability of multi-antenna transmitting arrays to synthesize directional digital modulation signals at the antenna end is one of the hotspots in the field of physical layer secure communication in recent years. In this paper, a fundamental method is proposed. Convex optimization algorithm for sparse array directional modulation signal synthesis. Firstly, a non-convex optimization problem with sparse array as objective function and different performance requirements of directional modulation signal as constraints is established. Then for this non-convex problem, two different solutions are given: one is based on iterative weighted 1? Algorithm, but the result obtained by sparse algorithm may have the case that the spacing of array elements is less than half wavelength; The other is based on mixed integer programming to ensure that the cell spacing of the sparse algorithm is at least half a wavelength. Finally, based on the mixed integer programming algorithm, an optimization problem is established to optimize the power efficiency of sparse array directional modulation signal transmitters. The simulation results show that. Compared with the existing directional modulation signal synthesis algorithm based on uniform equidistant linear array, the proposed algorithm has the security performance in the direction modulation signal. There is good design flexibility between the power efficiency of the directional modulation signal transmitter and the sparsity of the array.
【作者单位】：南京邮电大学通信与信息工程学院;
【基金】：国家自然科学基金(61302102,61271232) 江苏省属高校自然科学研究面上项目(13KJB510023) 国家博士后自然科学基金(2013M531390)~~
【分类号】：TN911.3
【正文快照】： 随着以大规模天线为代表的5G通信技术的高(13KJB510023),The National Science Foundation for Post-doctoral Scientists of China(2013M531390)速发展,无线通信技术在不同领域将得到更广泛的应用[1-3]。但由于无线传输媒介的开放性,通信信息在无线传输过程中的安全性越发引

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