【摘要】：無(wú)線通信物理層安全是利用無(wú)線信號(hào)傳輸過程中無(wú)線通信系統(tǒng)物理層的自身特性,通過設(shè)計(jì)無(wú)線通信系統(tǒng)物理層的編碼、調(diào)制和傳輸方式保障無(wú)線通信信息在物理層的安全傳輸。作為上層網(wǎng)絡(luò)加密協(xié)議的補(bǔ)充,物理層安全的研究有助于應(yīng)對(duì)傳統(tǒng)信息加密方式所面臨的挑戰(zhàn)。為了進(jìn)一步提升無(wú)線通信信號(hào)在物理層傳輸過程中的安全性,本文利用電磁散射特性可調(diào)的相位調(diào)制表面,基于方向調(diào)制技術(shù)提出了一種新型的方向數(shù)據(jù)加密通信系統(tǒng)。首先研究了相位調(diào)制表面的電磁特性,利用差分進(jìn)化算法優(yōu)化了其結(jié)構(gòu)中有源頻率選擇表面的電控方案,提升了相位調(diào)制表面的吸波性能。繼而將相位調(diào)制表面作為反射面天線的可控特性反射面,以高于激勵(lì)信號(hào)信息速率的電控頻率將相位調(diào)制表面中的有源層在強(qiáng)弱反射狀態(tài)間高速切換,對(duì)饋源發(fā)射的激勵(lì)信號(hào)進(jìn)行空間采樣后發(fā)射至自由空間。以該方式發(fā)射的無(wú)線通信信號(hào)在空間不同方向具有不同的接收信號(hào)星座圖,只在特定方向上可以還原通信信息,在其余方向由于接收信號(hào)星座圖的畸變無(wú)法解調(diào)出通信信息。同時(shí)該發(fā)射信號(hào)相比激勵(lì)信號(hào)帶寬大大擴(kuò)展致使信號(hào)頻譜隱藏于背景噪聲,使得敵對(duì)方難以探知并干擾期望接收機(jī)的正常通信。仿真結(jié)果表明,本文研究的通信系統(tǒng)中所傳輸?shù)姆较驍?shù)據(jù)加密信號(hào)具備低截獲概率、低檢測(cè)概率特性,并且具備一定的抗干擾、抗多徑信道衰落的能力,提高了無(wú)線通信信號(hào)在物理層傳輸過程中的安全性。
[Abstract]:The security of wireless communication physical layer is to make use of the characteristics of the physical layer of wireless communication system in the process of wireless signal transmission, and to design the coding of the physical layer of wireless communication system. The modulation and transmission mode ensures the secure transmission of wireless communication information in the physical layer. As a supplement to the upper network encryption protocol, the research of physical layer security is helpful to meet the challenges faced by the traditional information encryption methods. In order to further improve the security of wireless communication signal in the process of physical layer transmission, a new directional data encryption communication system based on directional modulation technology is proposed by using the phase modulation surface with adjustable electromagnetic scattering characteristics. Firstly, the electromagnetic characteristics of the phase modulation surface are studied, and the electronic control scheme of the active frequency selective surface in the structure is optimized by using the differential evolution algorithm, which improves the absorbing performance of the phase modulation surface. Then the phase modulation surface is used as the controllable characteristic reflector of the reflector antenna, and the active layer in the phase modulation surface is switched at a high speed between the strong and weak reflection states at an electronic control frequency higher than the excitation signal information rate. The excitation signal transmitted by the feed is sampled in space and transmitted to free space. The wireless communication signals transmitted in this way have different received signal constellations in different directions in space, and the communication information can only be restored in a specific direction. In the other directions, the communication information can not be solved because of the distortion of the received signal constellation. At the same time, compared with the excitation signal, the bandwidth of the transmitted signal is greatly expanded, which makes the signal spectrum hidden in the background noise, which makes it difficult for the enemy to detect and interfere with the normal communication of the desired receiver. The simulation results show that the direction data encrypted signal transmitted in the communication system studied in this paper has the characteristics of low probability of interception, low detection probability, anti-interference and anti-fading ability of multi-path channel. The security of wireless communication signal in the process of physical layer transmission is improved.
【學(xué)位授予單位】：南京郵電大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TN918

【參考文獻(xiàn)】

相關(guān)期刊論文 前8條

1 郭彬;楊育紅;朱義君;;方向調(diào)制信號(hào)干擾激勵(lì)優(yōu)化設(shè)計(jì)方法[J];信號(hào)處理;2016年05期

2 郭彬;楊育紅;王彬;辛剛;;方向調(diào)制技術(shù)分布式加權(quán)竊密方法[J];太赫茲科學(xué)與電子信息學(xué)報(bào);2016年02期

3 洪濤;;基于相位賦形的方向調(diào)制信號(hào)綜合方法研究[J];電子與信息學(xué)報(bào);2016年04期

4 黃開枝;洪穎;羅文宇;林勝斌;;基于演化博弈機(jī)制的物理層安全協(xié)作方法[J];電子與信息學(xué)報(bào);2015年01期

5 洪濤;宋茂忠;劉渝;;多目標(biāo)遺傳算法方向調(diào)制物理層安全通信信號(hào)設(shè)計(jì)[J];應(yīng)用科學(xué)學(xué)報(bào);2014年01期

6 洪濤;宋茂忠;劉渝;;一種基于方向調(diào)制的雙波束擴(kuò)頻安全通信系統(tǒng)[J];電子與信息學(xué)報(bào);2011年10期

7 張成剛;張強(qiáng);胡明春;;方環(huán)可調(diào)頻率選擇表面吸收體[J];微波學(xué)報(bào);2009年01期

8 宋茂忠;洪濤;陳林;;發(fā)射方向調(diào)制信號(hào)的多波束調(diào)制技術(shù)[J];武漢大學(xué)學(xué)報(bào)(理學(xué)版);2008年01期

，

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