【摘要】：有限頻譜資源的限制,迫使我們不得不進(jìn)一步研究新的通信技術(shù)以解決當(dāng)今移動(dòng)互聯(lián)網(wǎng)通信領(lǐng)域面臨的問題。未來的無線通信系統(tǒng)需要能夠提供更多高速率的多媒體業(yè)務(wù)和數(shù)據(jù)業(yè)務(wù),而協(xié)作通信的目的就是利用網(wǎng)絡(luò)中的節(jié)點(diǎn)資源來幫助有通信需求的節(jié)點(diǎn)進(jìn)行高速、可靠的無線通信。因此協(xié)作通信技術(shù)有望成為未來通信系統(tǒng)中的關(guān)鍵技術(shù)。網(wǎng)絡(luò)中節(jié)點(diǎn)工作模式分為HD模式和FD模式。半雙工協(xié)作通信空時(shí)編碼方案可以獲得很好的異步協(xié)作滿分集增益。但隨著對(duì)頻率資源利用率的迫切需求,許多學(xué)者和機(jī)構(gòu)想到把半雙工協(xié)作通信網(wǎng)絡(luò)空時(shí)編碼技術(shù)應(yīng)用到全雙工中繼網(wǎng)絡(luò)中,因其頻譜效率理論上可以提高一倍。但如果直接將這些空時(shí)編碼方案應(yīng)用到全雙工中繼系統(tǒng)中將會(huì)面臨嚴(yán)重的環(huán)路自干擾問題。因此分析如何消除自干擾問題成為研究全雙工中繼網(wǎng)絡(luò)的關(guān)鍵點(diǎn)。本論文在單向全雙工協(xié)作通信空時(shí)編碼的基礎(chǔ)上,提出了一種針對(duì)雙向全雙工協(xié)作通信系統(tǒng)的異步分布式空時(shí)編碼。雙向全雙工通信網(wǎng)絡(luò)中各節(jié)點(diǎn)采用的是FD模式,且都可以進(jìn)行雙向通信傳輸,可以大大提高頻譜利用率。本文對(duì)雙向全雙工系統(tǒng)各節(jié)點(diǎn)環(huán)路自干擾進(jìn)行分析,通過抵消中繼節(jié)點(diǎn)處的部分環(huán)路自干擾,將剩余環(huán)路自干擾信號(hào)加以利用,做為構(gòu)造分布式空時(shí)碼的一部分,設(shè)計(jì)出了適應(yīng)于雙向全雙工系統(tǒng)的異步協(xié)作分布式空時(shí)自編碼。同時(shí)針對(duì)雙向通信固有的特征,采用最優(yōu)化的功率放大因子準(zhǔn)則,使得協(xié)作通信系統(tǒng)的整體性能達(dá)到最優(yōu)。并結(jié)合仿真分析了終端節(jié)點(diǎn)處剩余環(huán)路信號(hào)對(duì)系統(tǒng)性能的影響以及中繼節(jié)點(diǎn)處剩余環(huán)路信號(hào)對(duì)系統(tǒng)的影響,同時(shí)又分析在通信過程中信道狀態(tài)比較良好的情況下,本論文提出設(shè)計(jì)的雙向全雙工異步協(xié)作分布式空時(shí)碼可以獲得滿分集增益,提高系統(tǒng)的性能和容量。
[Abstract]:Due to the limitation of limited spectrum resources, we have to further study new communication technologies to solve the problems in the field of mobile Internet communication. Future wireless communication systems need to provide more multimedia services and data services with high rates. The purpose of cooperative communication is to use node resources in the network to help nodes with communication needs to carry out high-speed and reliable wireless communication. Therefore, cooperative communication technology is expected to become the key technology in future communication systems. The node working mode in the network is divided into HD mode and FD mode. Half duplex cooperative communication space-time coding scheme can obtain good asynchronous cooperative full diversity gain. However, with the urgent need for the utilization of frequency resources, many scholars and institutions have come up with the idea of applying space-time coding technology to full-duplex relay networks, because its spectral efficiency can be doubled in theory. However, if these space-time coding schemes are directly applied to full-duplex relay systems, they will face a serious loop self-interference problem. Therefore, how to eliminate self-interference becomes a key point in the research of full duplex relay network. On the basis of unidirectional full-duplex cooperative space-time coding, this paper proposes an asynchronous distributed space-time coding for bi-directional full-duplex cooperative communication system. In the bi-directional full-duplex communication network, each node adopts the FD mode, and can carry on the two-way communication transmission, which can greatly improve the spectrum efficiency. In this paper, the self-interference of each node in the bi-directional full-duplex system is analyzed. The residual loop self-interference signal is used as part of the distributed space-time code by canceling the partial loop self-interference at the relay node. An asynchronous cooperative distributed space-time self-coding system for dual-directional full-duplex systems is designed. At the same time, according to the inherent characteristics of two-way communication, the optimal power amplification factor criterion is adopted to optimize the overall performance of the cooperative communication system. The influence of the residual loop signal at the terminal node on the system performance and the influence of the residual loop signal at the relay node on the system performance are analyzed by simulation. At the same time, when the channel state is relatively good in the communication process, the influence of the residual loop signal at the terminal node on the system performance is analyzed. In this paper, we propose that the bi-directional fully duplex asynchronous cooperative distributed space-time code can gain full diversity gain and improve the performance and capacity of the system.
【學(xué)位授予單位】：西安電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TN92

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本文編號(hào)：2258196