本文選題：物理層安全傳輸 + 非理想信道估計�。� 參考：《電子科技大學(xué)》2017年碩士論文

【摘要】：物理層安全技術(shù)摒棄了基于計算復(fù)雜度不可行的傳統(tǒng)安全方法,創(chuàng)新地利用無線噪聲信道內(nèi)在的隨機的獨特性和不可復(fù)制性,以信道噪聲為“密鑰”實現(xiàn)無線數(shù)據(jù)傳輸?shù)陌踩�。然�?現(xiàn)有針對物理層安全傳輸?shù)难芯看蠖嗍羌僭O(shè)信道狀態(tài)信息理想的前提下進行的,但在實現(xiàn)應(yīng)用中信道估計誤差不可避免,在實際無線通信系統(tǒng)中得到的都是非理想信道狀態(tài)信息。基于理想信道狀態(tài)信息的物理層安全傳輸研究缺乏對非理想因素的適應(yīng)能力,因而與實際系統(tǒng)存在差異,無法實現(xiàn)目標安全性�；谏鲜鰡栴}的考慮,本論文以提高無線通信的安全性為目標,研究非理想信道估計條件下的物理層安全傳輸系統(tǒng)性能,主要研究工作如下:1.研究基于MIMO竊聽信道模型的“無條件安全”通信系統(tǒng):首先,利用基于SVD預(yù)編碼的波束成形技術(shù)建立“優(yōu)勢信道”,經(jīng)MATLAB仿真結(jié)果表明該技術(shù)在理想與非理想信道估計條件下均能有效擴大合法接收者的優(yōu)勢;其次,本文提出基于BCH碼的安全編碼方案,經(jīng)MATLAB仿真結(jié)果表明該方案顯著擴大竊聽者的接收誤碼率。2.建立MIMO波束成形聯(lián)合安全編碼的“無條件安全”通信系統(tǒng)模型,討論分析其在理想與非理想信道條件下系統(tǒng)的安全性能,證明信道估計誤差對系統(tǒng)安全性能的影響以及實際系統(tǒng)中物理層安全傳輸?shù)目蓪崿F(xiàn)性�；赨SRP-LabVIEW平臺實現(xiàn)多天線物理層安全傳輸系統(tǒng)的測試,其結(jié)果表明所建系統(tǒng)具有通信的安全性和可靠性,證明該系統(tǒng)可以實現(xiàn)無條件安全傳輸。3.建立人工噪聲結(jié)合協(xié)作干擾的MISOSE模型,以系統(tǒng)安全速率作為衡量系統(tǒng)安全性能的指標,優(yōu)化功率分配方案,使系統(tǒng)安全速率達到最大。4.針對非理想情況,建立三種不同場景下的MISOSE協(xié)作模型,分別計算最優(yōu)功率分配下的系統(tǒng)安全速率。比較理想與非理想信道條件下系統(tǒng)安全速率最大值,分析估計誤差對系統(tǒng)安全性能的影響,驗證在有信道估計誤差的實際通信環(huán)境中物理層安全傳輸?shù)目蓪崿F(xiàn)性。經(jīng)MATLAB仿真得到,非理想信道估計條件下三種MISOSE協(xié)作模型以及理想模型隨發(fā)送端的功率分配比從0到1漸變時的系統(tǒng)安全速率值的變化曲線,找到最優(yōu)功率分配方案。
[Abstract]:Physical layer security technology abandons traditional security methods based on computational complexity infeasibility and innovatively utilizes the inherent randomness and non-replicability of wireless noise channels. The security of wireless data transmission is realized by using channel noise as "key". However, most of the existing researches on physical layer secure transmission are based on the assumption that the channel state information is ideal, but the channel estimation error is inevitable in the application. In the actual wireless communication system, all of them are not ideal channel state information. The research of physical layer security transmission based on ideal channel state information lacks the adaptability to the non-ideal factors, so it is different from the real system and can not realize the target security. In order to improve the security of wireless communication, the performance of physical layer secure transmission system under the condition of non-ideal channel estimation is studied in this paper. The main research work is as follows: 1. The "unconditional secure" communication system based on MIMO eavesdropping channel model is studied. Firstly, the "dominant channel" is established by using the beamforming technology based on SVD precoding. The simulation results of MATLAB show that this technique can effectively expand the advantages of the legitimate receiver under both ideal and non-ideal channel estimation conditions. Secondly, this paper proposes a secure coding scheme based on BCH code. The simulation results of MATLAB show that the scheme can significantly increase the bit error rate (BER) of eavesdroppers. The "unconditional secure" communication system model of MIMO beamforming joint security coding is established, and the security performance of the system under ideal and non-ideal channel conditions is discussed and analyzed. The influence of channel estimation error on the security performance of the system and the realizability of the physical layer secure transmission in the real system are proved. Based on USRP-LabVIEW platform, the security transmission system of multi-antenna physical layer is tested. The results show that the system has the security and reliability of communication, and proves that the system can realize unconditional secure transmission. The MISOSE model of artificial noise combined with cooperative interference is established. The system security rate is taken as the index to evaluate the security performance of the system and the power allocation scheme is optimized to maximize the security rate of the system. In order to solve the non-ideal situation, the MISOSE cooperation model under three different scenarios is established, and the system security rate under optimal power allocation is calculated respectively. Comparing the maximum of system security rate under ideal and non-ideal channel conditions, the influence of estimation error on system security performance is analyzed, and the realizability of physical layer secure transmission in real communication environment with channel estimation error is verified. By MATLAB simulation, three kinds of misosse cooperation model and the curve of the system security rate when the power distribution ratio of the transmitter changes from 0 to 1 under the condition of non-ideal channel estimation are obtained, and the optimal power allocation scheme is found.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TN918

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本文編號：2090501