本文選題：物理層安全 + 隨機(jī)加擾�。� 參考：《解放軍信息工程大學(xué)》2014年碩士論文

【摘要】：跳空通信是一種通過快速隨機(jī)切換空域收發(fā)信道,增加竊聽者獲取信息難度的物理層安全技術(shù)。目前,跳空通信技術(shù)主要存在以下兩個問題:1)現(xiàn)有跳空通信均依靠預(yù)先協(xié)商的跳空圖案切換空域收發(fā)信道,跳空圖案存在泄露風(fēng)險,給系統(tǒng)帶來安全隱患;2)跳空通信由于在良莠不齊的等效空域信道之間快速切換,信息傳輸速率較低。針對上述問題,本文依托國家自然科學(xué)基金項目,對基于圖案隱藏的物理層安全跳空通信技術(shù)展開研究。本文首先建立基于圖案隱藏的跳空通信模型。在該模型指導(dǎo)下,針對MIMO系統(tǒng)提出了基于時域差分跳空的物理層安全機(jī)制,并給出了其在MIMO單用戶和多用戶場景下的實現(xiàn)方法;針對SIMO-OFDM系統(tǒng),從頻域角度出發(fā),提出了基于頻域參考跳空的物理層安全方法;在圖案隱藏的基礎(chǔ)上,針對MIMO跳空系統(tǒng)信息傳輸速率較低的問題,提出了基于信息導(dǎo)向跳空的物理層安全方法。具體的研究內(nèi)容包括:1、基于時域差分跳空的MIMO系統(tǒng)物理層安全機(jī)制。通過在發(fā)送信號中添加人工干擾,使合法用戶接收到的空域信號隨機(jī)快變;使用合法用戶上一時刻接收的空域信號,作為當(dāng)前時刻合法用戶的接收權(quán)向量,與主信道組合得到等效收發(fā)信道,由此實現(xiàn)隨機(jī)跳空。由于主信道與竊聽信道的差異性及等效信道分布的隨機(jī)性,竊聽者無法跟蹤跳空過程,從而無法通過干擾抑制方法實現(xiàn)竊聽。對MIMO單用戶和多用戶場景,分別通過在等效信道的零空間發(fā)送人工噪聲和多用戶干擾得到隨機(jī)快變的空域接收信號,實現(xiàn)時域差分跳空。2、基于頻域參考跳空的SIMO-OFDM系統(tǒng)物理層安全方法。每個符號周期,發(fā)送端隨機(jī)選擇合法用戶天線,使用多個參考子載波帶來的冗余向選中天線傳遞隨機(jī)參考變量,同時對非選中天線形成零陷,所選天線與參考變量共同組成跳空圖案。然后,各數(shù)據(jù)子載波根據(jù)跳空圖案對調(diào)制符號進(jìn)行隨機(jī)加權(quán),合法用戶從參考子載波獲取跳空圖案并正確解調(diào),從而實現(xiàn)跳空傳輸。竊聽者無法獲取跳空圖案,從而無法跟蹤建立穩(wěn)定信道用于竊聽。理論分析和仿真結(jié)果表明:竊聽者無法通過差分譯碼及盲解調(diào)方法實現(xiàn)竊聽,BPSK調(diào)制的情況下,其誤碼率接近0.5。3、基于信息導(dǎo)向跳空的MIMO系統(tǒng)物理層安全方法。保密信息分為信號調(diào)制符號(RMS)和信道調(diào)制符號(CMS)兩部分,使用跳空集合中各等效空域信道的差異性調(diào)制CMS,根據(jù)CMS選擇等效空域信道發(fā)送RMS。CMS將信息保密性與跳空圖案保密性相結(jié)合,起到同時傳輸保密信息和生成跳空圖案的作用。理論分析和仿真結(jié)果表明,竊聽者無法跟蹤跳空過程,從而無法實現(xiàn)竊聽;而由于跳空過程承載了一部分保密信息,主信道傳輸速率得到提高,信噪比為10dB的情況下,傳輸速率提高了0.5bit/s/Hz。
[Abstract]:Air-hop communication is a kind of physical layer security technology which increases the difficulty for eavesdroppers to obtain information by switching spatial transceiver channels at random. At present, there are two main problems in the air-hopping communication technology: 1) the existing air-hopping communication all rely on the pre-negotiated air-hopping pattern to switch the space-domain transceiver channel, and the air-hopping pattern has the risk of leakage. Due to the fast switching between the good and bad equivalent airspace channels, the information transmission rate is low. In order to solve the above problems, this paper, relying on the project of National Natural Science Foundation, studies the secure air-hopping communication technology in the physical layer based on pattern hiding. In this paper, we first establish a pattern-hiding-based hopping communication model. Under the guidance of the model, a physical layer security mechanism based on time-domain difference hopping is proposed for MIMO systems, and its implementation method in MIMO single-user and multi-user scenarios is given. A physical layer security method based on frequency domain reference hopping is proposed, and a physical layer security method based on information guidance is proposed to solve the problem of low transmission rate of MIMO air-hopping system based on pattern hiding. The specific research content includes: 1, MIMO system physical layer security mechanism based on time domain difference space hopping. By adding artificial interference to the transmitted signal, the spatial domain signal received by the legitimate user is changed at random, and the airspace signal received by the legitimate user at the last moment is used as the receiving weight vector of the legitimate user at the current time. The equivalent transceiver channel is obtained by combining with the main channel, and the random hopping is realized. Because of the difference between primary channel and eavesdropping channel and the randomness of equivalent channel distribution, eavesdroppers can not track the hopping process, so they can not achieve eavesdropping by interference suppression method. For MIMO single-user and multi-user scenarios, random and fast spatial received signals are obtained by transmitting artificial noise and multi-user interference in the null space of the equivalent channel, respectively. The physical layer security method of SIMO-OFDM system based on frequency-domain reference hopping is implemented. For each symbol period, the sender randomly selects the legitimate user antenna, transmits random reference variables to the selected antenna using redundancy brought by multiple reference subcarriers, and forms a null trap on the unselected antenna. The selected antenna and the reference variables together form an empty pattern. Then, each data subcarrier carries on the random weight to the modulation symbol according to the hopping pattern, the legitimate user acquires the hopping pattern from the reference subcarrier and demodulates correctly, thus realizes the hopping transmission. Eavesdroppers can't get hopping patterns, so they can't track and establish stable channels for eavesdropping. Theoretical analysis and simulation results show that eavesdroppers can not achieve BPSK modulation by differential decoding and blind demodulation, and the BER is close to 0.5.3. The physical layer security method of MIMO system based on information oriented hopping is proposed. The secret information is divided into two parts: signal modulation symbol (RMS) and channel modulation symbol (CMS). The CMSs are modulated by the difference of each equivalent spatial channel in the empting-hopping set, and the RMS.CMS is sent according to the CSS-selected equivalent airspace channel, which combines the information secrecy with the air-hopping pattern secrecy, which plays the role of transmitting the secret information and generating the empty hopping pattern simultaneously. Theoretical analysis and simulation results show that the eavesdropper can not track the hopping process, so that the eavesdropping can not be realized. However, the transmission rate of the main channel is improved and the signal-to-noise ratio (SNR) is 10dB because the hopping process carries part of the secret information. The transmission rate increased by 0.5 bits / s / Hz.
【學(xué)位授予單位】：解放軍信息工程大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TN918

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