發(fā)布時(shí)間：2018-05-19 08:36

  本文選題：組播系統(tǒng) + 物理層安全　； 參考：《北京交通大學(xué)》2017年碩士論文

【摘要】：無(wú)線組播技術(shù)利用無(wú)線信道的廣播特性,能夠同時(shí)向不同的用戶發(fā)送相同的數(shù)據(jù),因而具有較高的通信效率,在移動(dòng)通信系統(tǒng)中有著廣泛的應(yīng)用前景。但是無(wú)線信道的高度開放性也為組播系統(tǒng)的安全性帶來(lái)了嚴(yán)峻的挑戰(zhàn)。物理層安全技術(shù)從信息論角度出發(fā),利用無(wú)線信道的傳輸特性以及信號(hào)處理技術(shù),能夠有效地提高系統(tǒng)安全性,是現(xiàn)有安全機(jī)制的一個(gè)重要補(bǔ)充。本文主要研究了多小區(qū)組播系統(tǒng)的安全傳輸問題,研究?jī)?nèi)容如下:首先,針對(duì)多小區(qū)組播系統(tǒng)中下行鏈路安全傳輸問題,本文提出了一種基于多個(gè)小區(qū)聯(lián)合波束賦形的安全傳輸策略。通過(guò)結(jié)合半正定松弛技術(shù)和一維線性搜索方法,研究了服務(wù)質(zhì)量(Quality of Service,QoS)和安全傳輸速率約束下的總發(fā)射功率最小化問題,并對(duì)各基站的波束賦形向量進(jìn)行了聯(lián)合優(yōu)化。仿真結(jié)果表明,該算法能夠有效地降低整個(gè)系統(tǒng)以及本地小區(qū)的功率消耗。其次,在上一章內(nèi)容的基礎(chǔ)上,研究了多個(gè)竊聽用戶場(chǎng)景下的多小區(qū)組播安全傳輸問題。該場(chǎng)景中,周邊小區(qū)用戶均被認(rèn)為是潛在的竊聽者。對(duì)于理想信道狀態(tài)信息情況,首先對(duì)功率約束下的秘密速率最大化問題進(jìn)行了研究。進(jìn)一步,針對(duì)竊聽信道狀態(tài)信息存在誤差場(chǎng)景,利用最差性能優(yōu)化方法,設(shè)計(jì)了魯棒性的安全傳輸策略。仿真結(jié)果表明,相比于獨(dú)立波束賦形方法,本文提出的算法能夠有效地提高系統(tǒng)的安全傳輸速率,并且魯棒性發(fā)射策略依然可以獲得較好的安全傳輸性能。
[Abstract]:Wireless multicast technology can transmit the same data to different users at the same time, so it has high communication efficiency and has a wide application prospect in mobile communication systems. However, the high openness of wireless channel also brings serious challenges to the security of multicast system. From the point of view of information theory, physical layer security technology can effectively improve system security by using wireless channel transmission characteristics and signal processing technology, which is an important supplement to existing security mechanisms. This paper mainly studies the secure transmission of multi-cell multicast system. The research contents are as follows: firstly, aiming at the downlink secure transmission in multi-cell multicast system, In this paper, a secure transmission strategy based on multiple cell joint beamforming is proposed. Combined with positive semidefinite relaxation technique and one-dimensional linear search method, the problem of minimizing total transmit power under the constraint of quality of Service (QoS) and secure transmission rate is studied, and the beamforming vectors of each base station are jointly optimized. Simulation results show that the proposed algorithm can effectively reduce the power consumption of the whole system and local cells. Secondly, on the basis of the previous chapter, the secure transmission of multi-cell multicast in multiple eavesdropping user scenarios is studied. In this scenario, the surrounding cell users are considered to be potential eavesdroppers. In the case of ideal channel state information, the problem of secret rate maximization under power constraints is studied. Furthermore, in view of the error scenario of eavesdropping channel state information, a robust secure transmission strategy is designed by using the worst performance optimization method. The simulation results show that compared with the independent beamforming method, the proposed algorithm can effectively improve the secure transmission rate of the system, and the robust transmission strategy can still achieve better secure transmission performance.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TN918

【相似文獻(xiàn)】

相關(guān)期刊論文 前10條

1 林琪,李津軍;文件全文信息的網(wǎng)絡(luò)安全傳輸[J];計(jì)算機(jī)工程;2000年08期

2 韓英俊;;互聯(lián)網(wǎng)安全傳輸技術(shù)探討[J];泰州職業(yè)技術(shù)學(xué)院學(xué)報(bào);2007年06期

3 溫先輝;馬兆豐;蔣銘;鈕心忻;楊義先;;雙連接文件安全傳輸?shù)脑O(shè)計(jì)與實(shí)現(xiàn)[J];計(jì)算機(jī)工程與應(yīng)用;2012年25期

4 劉s，

本文編號(hào)：1909430