【摘要】：衡量一個(gè)通信系統(tǒng)性能優(yōu)劣主要是考察其有效性、可靠性和安全性這三方面性能。與有線(xiàn)通信相比,無(wú)線(xiàn)通信在有效性、可靠性和安全性方面面臨更為嚴(yán)峻的挑戰(zhàn)：一方面,多徑衰落效應(yīng)將導(dǎo)致接收信號(hào)畸變、信噪比較低,從而影響信息傳輸有效性和可靠性：另一方面,無(wú)線(xiàn)信道的開(kāi)放性將導(dǎo)致傳輸信息易被竊聽(tīng)器截獲,從而使得信息傳輸?shù)陌踩越档汀＝陙?lái),MIMO技術(shù)和協(xié)作通信技術(shù)被認(rèn)為是改善和提高無(wú)線(xiàn)通信系統(tǒng)這三方面性能的有效手段,受到學(xué)術(shù)界和產(chǎn)業(yè)界的廣泛關(guān)注和深入研究。無(wú)線(xiàn)協(xié)作通信技術(shù)的核心研究?jī)?nèi)容是設(shè)計(jì)有效的協(xié)作傳輸策略,使得無(wú)線(xiàn)通信系統(tǒng)在有效性、可靠性或者安全性方面的性能得到明顯的改善。 眾所周知,復(fù)用增益與分集增益分別是評(píng)價(jià)MIMO無(wú)線(xiàn)通信系統(tǒng)有效性和可靠性的性能指標(biāo)。已有的研究表明,復(fù)用增益和分集增益之間是此消彼長(zhǎng)的關(guān)系,即高復(fù)用增益會(huì)導(dǎo)致較低的分集增益,反之亦然；分集復(fù)用折中(DMT)正是反映了分集增益和復(fù)用增益之間的這種折中關(guān)系。因此,通過(guò)分析DMT性能來(lái)評(píng)估協(xié)作傳輸系統(tǒng)有效性和可靠性是一個(gè)合理的選擇。另外,衡量傳輸系統(tǒng)安全性的性能指標(biāo)通常采用“安全速率”,其含義是授權(quán)用戶(hù)能正確解碼、而竊聽(tīng)器不能解碼的信息傳輸速率。 本文針對(duì)幾種典型的無(wú)線(xiàn)協(xié)作通信場(chǎng)景,研究基于DMT優(yōu)化或者安全速率優(yōu)化的無(wú)線(xiàn)協(xié)作傳輸策略。在對(duì)抗多徑衰落方面,設(shè)計(jì)更為有效的多中繼協(xié)作傳輸策略,優(yōu)化系統(tǒng)的DMT性能；在對(duì)抗竊聽(tīng)方面,設(shè)計(jì)更為有效的混合式協(xié)作傳輸策略,達(dá)到更大的安全速率。本文主要研究?jī)?nèi)容與貢獻(xiàn)如下： 1)對(duì)于多中繼點(diǎn)對(duì)點(diǎn)信道模型,提出了一種基于中繼復(fù)用的協(xié)作傳輸策略。該策略的基本思想是用兩個(gè)半雙工中繼模擬一個(gè)全雙工中繼,克服中繼的半雙工限制；另外,該策略融合了分層中繼選擇和線(xiàn)性迫零算法,其中分層中繼選擇保證了最優(yōu)的分集增益,而復(fù)雜度較低的迫零算法用于消除中繼間干擾。理論分析和Monte Carlo仿真實(shí)驗(yàn)表明該策略能優(yōu)化系統(tǒng)的DMT性能,并且能逼近多輸入單輸出(MISO)系統(tǒng)的最優(yōu)上界。 2)對(duì)于多中繼多接入信道模型,提出了一種基于疊加編碼和中繼復(fù)用的協(xié)作傳輸策略。該協(xié)作策略的特點(diǎn)是保證每個(gè)源信息能在各個(gè)源端以及中繼上被發(fā)送,從而實(shí)現(xiàn)源端之間以及源端與中繼之間的完全協(xié)作,從而達(dá)到該系統(tǒng)的最優(yōu)分集增益。理論分析和Monte Carlo仿真實(shí)驗(yàn)表明,該策略能優(yōu)化系統(tǒng)DMT性能,并且能逼近最優(yōu)MISO系統(tǒng)的上界。 3)對(duì)于中繼竊聽(tīng)信道,提出了三種混合式協(xié)作傳輸策略：基于有噪網(wǎng)絡(luò)編碼(NNC)的策略、基于部分解碼前傳(PaDF)的策略、基于人工狀態(tài)(AS)的策略。第一種協(xié)作策略融合了NNC壓縮前傳技術(shù)和干擾協(xié)助技術(shù),其中的NNC壓縮前傳技術(shù)是為了提升授權(quán)用戶(hù)間的通信能力,而干擾協(xié)助技術(shù)是為了抑制竊聽(tīng)信道,從而達(dá)到幫助主信道、同時(shí)抑制竊聽(tīng)信道的效果。第二種協(xié)作策略利用疊加編碼、反向解碼等基本編解碼方法,融合部分解碼前傳技術(shù)和噪聲前傳技術(shù),以提升授權(quán)用戶(hù)間的通信能力、同時(shí)抑制竊聽(tīng)信道。第三種協(xié)作策略融合了人工狀態(tài)和噪聲前傳技術(shù),其中的人工狀態(tài)是由源端產(chǎn)生,它聯(lián)合中繼產(chǎn)生的干擾信息可以有效地抑制竊聽(tīng)信道,而不對(duì)目的端產(chǎn)生任何損害。這種協(xié)作策略的特點(diǎn)是中繼不接收任何源端信息,因而不受源端到中繼信道質(zhì)量的影響。 另外,針對(duì)高斯中繼竊聽(tīng)信道,對(duì)以上三種協(xié)作傳輸策略作了具體的設(shè)計(jì),并利用信息論安全基礎(chǔ)理論分析了它們的可達(dá)安全速率。理論分析和數(shù)值結(jié)果均表明所提協(xié)作策略可以提升系統(tǒng)的安全性能。 4)對(duì)于具有“會(huì)議”的多接入竊聽(tīng)信道,提出了一種基于Willems編碼的混合式協(xié)作傳輸策略。其基本思想是融合Willems編碼和Wyner的隨機(jī)盒子技術(shù),既可以通過(guò)“會(huì)議”鏈路提升源到目的端的通信能力,又能通過(guò)多接入竊聽(tīng)信道抑制竊聽(tīng)器的竊聽(tīng)能力。另外,利用信息論安全基礎(chǔ)理論分析了該策略的可達(dá)安全速率域以及安全容量域的外界。 基于以上所提協(xié)作策略,并針對(duì)高斯多接入竊聽(tīng)信道,設(shè)計(jì)了兩種具體實(shí)現(xiàn)方案：基于多路復(fù)用的方案和基于協(xié)作時(shí)分多址接入的方案。理論分析和數(shù)值計(jì)算結(jié)果表明,源端之間的“會(huì)議”鏈路能有效提升系統(tǒng)安全性以及各個(gè)源端的安全速率。
[Abstract]:The performance of a communication system is mainly based on its effectiveness, reliability and safety. Compared with wired communication, wireless communication faces more serious challenges in the aspects of validity, reliability and security: on the one hand, the multi-path fading effect will lead to the distortion of the received signal and the signal-to-noise ratio is low, thus affecting the validity and reliability of information transmission: on the other hand, the openness of the wireless channel will cause the transmission information to be easily intercepted and thus the security of the information transmission is reduced. In recent years, MIMO technology and cooperative communication technology are considered to be an effective means to improve and improve the performance of wireless communication system. The core research content of wireless cooperative communication technology is to design effective cooperative transmission strategy, so that the performance of wireless communication system in validity, reliability or security is obviously improved. As is well known, the multiplexing gain and diversity gain are the performance of evaluating the effectiveness and reliability of the MIMO wireless communication system, respectively. The existing research shows that the relationship between the multiplexing gain and the diversity gain is the relationship between the diversity gain and the diversity gain, that is, the high multiplexing gain can lead to lower diversity gain, and vice versa; and the split-set multiplexing trade-off (dmt) is the compromise between the diversity gain and the multiplexing gain. Therefore, it is reasonable to evaluate the effectiveness and reliability of the cooperative transmission system by analyzing the performance of dmt. Select. In addition, measure the performance index of the transmission system security Always use "security Rate", the meaning of which is to authorize the user to decode correctly, and the stolen information can not be decoded Rate. Based on several typical wireless collaborative communication scenarios, a wireless co-association based on dmt optimization or security rate optimization is investigated. As a transmission strategy, a more efficient multi-relay cooperative transmission strategy is designed to optimize the performance of the system in the aspect of multi-path fading, and a more efficient hybrid cooperative transmission strategy is designed in the aspect of anti-wiretapping, so as to achieve greater efficiency. Security rate. The main contents of this paper The contribution is as follows: 1) For multi-relay point-to-point channel model, a relay complex is proposed The basic idea of the strategy is to simulate a full-duplex relay with two half-duplex relay to overcome the half-duplex limitation of the relay; in addition, the strategy combines the hierarchical relay selection and the linear forcing zero algorithm, wherein the hierarchical relay selection guarantee Optimal diversity gain and low complexity forced-zero algorithm The theoretical analysis and Monte Carlo simulation experiments show that the strategy can optimize the performance of the system, and can approximate multi-input single-output (MISO). (2) For multi-relay multi-access channel model, a kind of superposition coding is proposed. The cooperative strategy is characterized in that each source information can be transmitted on each source end and the relay so as to realize the complete cooperation between the source end and the source end and the relay, and therefore, Theoretical analysis and Monte Carlo simulation experiments show that the strategy can optimize the performance of the system and can be approximated On the basis of the strategy of noisy network coding (NNC), the strategy based on partial decoding (PaDF) is proposed. According to the strategy of artificial state (AS), the first collaboration strategy combines the NNC compression pretransmission technology and the interference assistance technology, and the NNC compression pre-transmission technology is in order to improve the communication capability among the authorized users, and the interference assistance technology is to suppress the tap channel so as to reach the help of the master. the second cooperative strategy utilizes the basic encoding and decoding methods such as superposition coding, reverse decoding and the like, and the fusion part decodes the pre-transmission technology and the noise pre-transmission technology so as to improve the authorized users. the third cooperation strategy combines the artificial state and the noise pre-transmission technology, the artificial state is generated by the source end, the interference information generated by the joint relay can effectively inhibit the wiretap signal, Channel, without any damage to the destination, is characterized by the fact that the relay does not receive any source end information, and thus It is not affected by the quality of the source end to the relay channel. In addition, the above three cooperative transmission strategies are specially designed for the Gauss relay wiretapping channel, Theoretical analysis and numerical results show that they can reach the safe rate. the proposed collaboration strategy can promote Security performance of the system. 4) For multi-access wiretapping channels with "conference", a kind of base is proposed. A hybrid collaboration transmission strategy encoded by Willems. Its basic idea is to fuse Willems Code and W yner's random box technology allows both the source-to-destination communication capability to be raised through the & quot; conference & quot; link, and It can suppress the tapping ability of the bug through the multi-access interception channel. In addition, the basic theory of the system security is used to analyze the problem. The strategy can reach the secure rate domain and the outside of the secure capacity domain. multiplexing-based scheme and cooperative time division multiple access based connection Programme of admission Theoretical analysis and numerical calculation results show that the "meeting" between the source ends
【學(xué)位授予單位】：中國(guó)科學(xué)技術(shù)大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：TN92

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