基于阵列的方向调制在安全通信上的应用研究
发布时间：2018-08-15 14:22
【摘要】：基于方向调制的物理层安全无线通信技术目前受到了国内外学者的广泛研究,其基本原理是将相(频)控阵波束合成与信号期望到达的方向(位置)进行联合优化,使得发射的信号只在期望的方向(位置)上形成稳定的、可被识别的星座图,而在非期望方向(位置)造成星座紊乱的迹象。本文重点研究了基于频控阵的方向调制技术和相应的物理层安全通信原理。论文的主要工作如下:1.通过理论推导和计算机仿真等方法分析了频控阵波束的主要特点:频控阵波束具有距离周期性,在阵列发射位置呈螺旋向外扩散的现象。本文提出了“S”形频控阵波束的实现方法,这种波束可用于干扰敌方雷达,充分展现了频控阵的一些优势。随后通过MATLAB软件仿真验证了“S”波束和点形波束实现方法的可行性。2.在研究并分析了通过遗传算法来计算相位偏移的相控阵方向调制的基本原理和方法基础上,结合粒子群算法,给出了基于粒子群算法的相控阵方向调制方法。由于遗传算法收敛性不够好,不能保证每次迭代出结果,而这种方法在计算相位偏移的效率上有了进一步的提升,并且每次都能得到最优解。在已有的相控阵方向调制的基础上提出了基于频控阵的方向调制方法,这种方法能够实现对接收机位置更精确的选择(方向、距离双重选择)。尤其是在窃听接收机和期望接收机同方向的情况下,采用频控阵作为发射阵列能够实现安全通信,计算机仿真也验证了其正确性。3.在对基于切换天线阵列的方向调制扩频技术分析中,比较了在已有的切换方案条件下利用单一阵元和子阵分别作为切换单元系统的误码率和安全性能。由于阵列增益的存在,单一天线的安全性能比不上子阵,而针对目前已有的子阵切换方案的天线利用率低的局限,本文提出了一种新的天线(阵列)切换方案,这种方案相对于单一天线切换而言提高了安全性能,而对于已有的子阵切换提高了天线的利用率,该方案的有效性最终也通过了仿真验证。4.在MATLAB平台上搭建了一个采用方向调制技术的点对点的安全通信软件系统。该系统分别采用相控阵和频控阵作为发射阵列,并且对这两种方式的理论误码率和实际误码率进行了仿真和测试,测试结果表明可通过增加扩频码长度和子阵中阵元数目来提升安全性能。
[Abstract]:The physical layer secure wireless communication technology based on directional modulation has been widely studied at home and abroad. Its basic principle is to optimize the direction (position) of phase (frequency) controlled array beam synthesis and the direction (position) of signal expected arrival. The transmitted signal forms only a stable recognizable constellation diagram in the desired direction (position) and signs of constellation disorder in the non-desired direction (position). This paper focuses on the directional modulation technology based on frequency control array and the corresponding physical layer secure communication principle. The main work of the thesis is as follows: 1: 1. The main characteristics of the frequency array beam are analyzed by theoretical derivation and computer simulation. The frequency control array beam has the periodic distance and the phenomenon of spiral outward diffusion at the position of the array emission. In this paper, the realization method of "S" shape frequency control array beam is proposed. This beam can be used to interfere with enemy radar, which fully shows some advantages of frequency control array. Then, the feasibility of "S" beam and dot beam realization method is verified by MATLAB software simulation. Based on the study and analysis of the basic principle and method of phase offset phase array directional modulation based on genetic algorithm and particle swarm optimization algorithm, a phase array direction modulation method based on particle swarm optimization algorithm is presented. Because the convergence of genetic algorithm is not good enough, it can not guarantee the result of each iteration, and the efficiency of calculating phase shift is further improved by this method, and the optimal solution can be obtained every time. Based on the existing directional modulation of phased array, a direction modulation method based on frequency control array is proposed. This method can select the receiver position more accurately (direction, distance double selection). Especially in the case of the eavesdropping receiver and the expected receiver in the same direction, the frequency control array can be used as the transmitting array to realize the secure communication. The computer simulation also verifies its correctness. 3. In the analysis of directional modulation spread spectrum technology based on switched antenna array, the BER and security performance of single burst element and subarray are compared under the existing handover scheme. Due to the existence of array gain, the security performance of a single antenna is not better than that of a subarray. In view of the low antenna utilization rate of the existing subarray switching schemes, a new antenna (array) switching scheme is proposed in this paper. Compared with single antenna switching, this scheme improves the security performance, and improves the antenna utilization rate for the existing subarray switching. Finally, the effectiveness of the scheme is verified by simulation. 4. A point-to-point secure communication software system based on directional modulation technology is built on MATLAB platform. The system adopts phased array and frequency control array as transmitting array, and simulates and tests the theoretical and actual bit error rate of these two methods. The test results show that the security performance can be improved by increasing the spread spectrum code length and the number of elements in the subarray.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN918
本文编号：2184476
[Abstract]:The physical layer secure wireless communication technology based on directional modulation has been widely studied at home and abroad. Its basic principle is to optimize the direction (position) of phase (frequency) controlled array beam synthesis and the direction (position) of signal expected arrival. The transmitted signal forms only a stable recognizable constellation diagram in the desired direction (position) and signs of constellation disorder in the non-desired direction (position). This paper focuses on the directional modulation technology based on frequency control array and the corresponding physical layer secure communication principle. The main work of the thesis is as follows: 1: 1. The main characteristics of the frequency array beam are analyzed by theoretical derivation and computer simulation. The frequency control array beam has the periodic distance and the phenomenon of spiral outward diffusion at the position of the array emission. In this paper, the realization method of "S" shape frequency control array beam is proposed. This beam can be used to interfere with enemy radar, which fully shows some advantages of frequency control array. Then, the feasibility of "S" beam and dot beam realization method is verified by MATLAB software simulation. Based on the study and analysis of the basic principle and method of phase offset phase array directional modulation based on genetic algorithm and particle swarm optimization algorithm, a phase array direction modulation method based on particle swarm optimization algorithm is presented. Because the convergence of genetic algorithm is not good enough, it can not guarantee the result of each iteration, and the efficiency of calculating phase shift is further improved by this method, and the optimal solution can be obtained every time. Based on the existing directional modulation of phased array, a direction modulation method based on frequency control array is proposed. This method can select the receiver position more accurately (direction, distance double selection). Especially in the case of the eavesdropping receiver and the expected receiver in the same direction, the frequency control array can be used as the transmitting array to realize the secure communication. The computer simulation also verifies its correctness. 3. In the analysis of directional modulation spread spectrum technology based on switched antenna array, the BER and security performance of single burst element and subarray are compared under the existing handover scheme. Due to the existence of array gain, the security performance of a single antenna is not better than that of a subarray. In view of the low antenna utilization rate of the existing subarray switching schemes, a new antenna (array) switching scheme is proposed in this paper. Compared with single antenna switching, this scheme improves the security performance, and improves the antenna utilization rate for the existing subarray switching. Finally, the effectiveness of the scheme is verified by simulation. 4. A point-to-point secure communication software system based on directional modulation technology is built on MATLAB platform. The system adopts phased array and frequency control array as transmitting array, and simulates and tests the theoretical and actual bit error rate of these two methods. The test results show that the security performance can be improved by increasing the spread spectrum code length and the number of elements in the subarray.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN918
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