【摘要】：基于方向調(diào)制的物理層安全無(wú)線通信技術(shù)目前受到了國(guó)內(nèi)外學(xué)者的廣泛研究,其基本原理是將相(頻)控陣波束合成與信號(hào)期望到達(dá)的方向(位置)進(jìn)行聯(lián)合優(yōu)化,使得發(fā)射的信號(hào)只在期望的方向(位置)上形成穩(wěn)定的、可被識(shí)別的星座圖,而在非期望方向(位置)造成星座紊亂的跡象。本文重點(diǎn)研究了基于頻控陣的方向調(diào)制技術(shù)和相應(yīng)的物理層安全通信原理。論文的主要工作如下:1.通過(guò)理論推導(dǎo)和計(jì)算機(jī)仿真等方法分析了頻控陣波束的主要特點(diǎn):頻控陣波束具有距離周期性,在陣列發(fā)射位置呈螺旋向外擴(kuò)散的現(xiàn)象。本文提出了“S”形頻控陣波束的實(shí)現(xiàn)方法,這種波束可用于干擾敵方雷達(dá),充分展現(xiàn)了頻控陣的一些優(yōu)勢(shì)。隨后通過(guò)MATLAB軟件仿真驗(yàn)證了“S”波束和點(diǎn)形波束實(shí)現(xiàn)方法的可行性。2.在研究并分析了通過(guò)遺傳算法來(lái)計(jì)算相位偏移的相控陣方向調(diào)制的基本原理和方法基礎(chǔ)上,結(jié)合粒子群算法,給出了基于粒子群算法的相控陣方向調(diào)制方法。由于遺傳算法收斂性不夠好,不能保證每次迭代出結(jié)果,而這種方法在計(jì)算相位偏移的效率上有了進(jìn)一步的提升,并且每次都能得到最優(yōu)解。在已有的相控陣方向調(diào)制的基礎(chǔ)上提出了基于頻控陣的方向調(diào)制方法,這種方法能夠?qū)崿F(xiàn)對(duì)接收機(jī)位置更精確的選擇(方向、距離雙重選擇)。尤其是在竊聽(tīng)接收機(jī)和期望接收機(jī)同方向的情況下,采用頻控陣作為發(fā)射陣列能夠?qū)崿F(xiàn)安全通信,計(jì)算機(jī)仿真也驗(yàn)證了其正確性。3.在對(duì)基于切換天線陣列的方向調(diào)制擴(kuò)頻技術(shù)分析中,比較了在已有的切換方案條件下利用單一陣元和子陣分別作為切換單元系統(tǒng)的誤碼率和安全性能。由于陣列增益的存在,單一天線的安全性能比不上子陣,而針對(duì)目前已有的子陣切換方案的天線利用率低的局限,本文提出了一種新的天線(陣列)切換方案,這種方案相對(duì)于單一天線切換而言提高了安全性能,而對(duì)于已有的子陣切換提高了天線的利用率,該方案的有效性最終也通過(guò)了仿真驗(yàn)證。4.在MATLAB平臺(tái)上搭建了一個(gè)采用方向調(diào)制技術(shù)的點(diǎn)對(duì)點(diǎn)的安全通信軟件系統(tǒng)。該系統(tǒng)分別采用相控陣和頻控陣作為發(fā)射陣列,并且對(duì)這兩種方式的理論誤碼率和實(shí)際誤碼率進(jìn)行了仿真和測(cè)試,測(cè)試結(jié)果表明可通過(guò)增加擴(kuò)頻碼長(zhǎng)度和子陣中陣元數(shù)目來(lái)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.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TN918

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本文編號(hào)：2184476