本文選題：協(xié)作通信 + 空時(shí)編碼��； 參考：《大連理工大學(xué)》2014年博士論文

【摘要】：協(xié)作通信技術(shù)利用多用戶間的協(xié)作,共享彼此的資源,從而獲得一定的空間分集增益,提高了系統(tǒng)的有效性和可靠性。協(xié)作通信技術(shù)不僅可以應(yīng)用在蜂窩移動(dòng)通信網(wǎng)中,還可以應(yīng)用于傳感器網(wǎng)絡(luò)、無(wú)線自組織網(wǎng)絡(luò)等多種場(chǎng)合,因此成為近年來(lái)通信領(lǐng)域研究的熱點(diǎn)。本文在深入分析國(guó)內(nèi)外研究工作的基礎(chǔ)上,針對(duì)基于編碼的協(xié)作通信技術(shù)展開(kāi)研究,取得的主要成果如下：以移動(dòng)通信系統(tǒng)下行鏈路為系統(tǒng)模型,提出了一種基于Alamouti空時(shí)編碼的放大轉(zhuǎn)發(fā)協(xié)作傳輸協(xié)議。首先,推導(dǎo)了瑞利衰落信道下M-PSK(M-ary Phase Shift Keying)調(diào)制時(shí)該系統(tǒng)的誤符號(hào)率及高信噪比區(qū)域的漸進(jìn)表達(dá)式。該方案能獲得階數(shù)為4的分集增益,有效提高了系統(tǒng)的可靠性。其次,推導(dǎo)了信源與中繼的最佳功率分配閉式表達(dá)式,使系統(tǒng)總功率不變時(shí)系統(tǒng)的誤符號(hào)率最小。 研究了基于數(shù)字噴泉碼的單中繼協(xié)作傳輸技術(shù),提出了兩種編碼方法。針對(duì)中繼協(xié)作傳輸?shù)挠?jì)算復(fù)雜度和傳輸延遲問(wèn)題,提出了一種分布式數(shù)字噴泉碼——DLT碼(Decomposed Luby Transform codes, DLT),設(shè)計(jì)了DLT碼的兩層編碼度分布函數(shù),并提出了一種基于DLT碼的協(xié)作通信傳輸協(xié)議。與現(xiàn)有的無(wú)碼率傳輸相比,該方案在各鏈路的丟包率較大時(shí)能有效減少中繼節(jié)點(diǎn)的復(fù)雜度和系統(tǒng)傳輸延遲。針對(duì)誤符號(hào)率的差錯(cuò)平臺(tái)問(wèn)題,提出了一種新的規(guī)則變量節(jié)點(diǎn)度LT碼編碼方法,該方法省去了現(xiàn)有方法中對(duì)變量節(jié)點(diǎn)度值表的排序、查找和更新過(guò)程,降低了編碼復(fù)雜度,并利用對(duì)度分布的修正改善了解碼瀑布區(qū)域,最后將該編碼方法應(yīng)用到單中繼協(xié)作通信系統(tǒng),并對(duì)誤符號(hào)率進(jìn)行了分析。與現(xiàn)有方法相比,該方法能節(jié)省系統(tǒng)編解碼時(shí)間,在有效降低誤符號(hào)率差錯(cuò)平臺(tái)的同時(shí),減少了譯碼所需信源平均傳輸次數(shù)。為了提高多中繼無(wú)碼率傳輸?shù)念l譜效率,提出了一種基于網(wǎng)絡(luò)編碼和中繼選擇的多中繼無(wú)碼率協(xié)作傳輸協(xié)議。該方法先建立成功譯碼的中繼集合,利用中繼選擇策略選擇最佳中繼參與協(xié)作,與此同時(shí)源節(jié)點(diǎn)發(fā)送當(dāng)前消息塊與下一個(gè)數(shù)據(jù)塊的網(wǎng)絡(luò)編碼信息,即可同時(shí)獲得分集增益和網(wǎng)絡(luò)編碼增益。此外,將準(zhǔn)靜態(tài)瑞利衰落信道等效成相應(yīng)的刪除信道,推導(dǎo)了目的端譯碼需要的數(shù)據(jù)包數(shù)的概率質(zhì)量函數(shù)和譯碼所需的平均傳輸次數(shù),并討論了中繼集合大小對(duì)系統(tǒng)性能的影響。與現(xiàn)有的多中繼無(wú)碼率傳輸方案相比,該方法能有效減少系統(tǒng)平均傳輸次數(shù),從而提高系統(tǒng)傳輸效率。
[Abstract]:Cooperative communication technology uses cooperation among multiusers and shares each other's resources to gain a certain spatial diversity gain and improves the effectiveness and reliability of the system. The cooperative communication technology can be applied not only in cellular mobile communication networks but also in sensor networks, wireless self-organizing networks and so on. On the basis of in-depth analysis of the research work at home and abroad, this paper studies the cooperative communication technology based on coding. The main achievements are as follows: using the downlink of the mobile communication system as the system model, a kind of amplified and forward cooperative transmission protocol based on Alamouti space-time coding is proposed. First, the error symbol rate and the high signal to noise ratio region of M-PSK (M-ary Phase Shift Keying) modulation in Rayleigh fading channel are derived. The scheme can obtain the diversity gain of the order of 4, which can effectively improve the reliability of the system. Secondly, the optimal power distribution closed expression of the source and the following is derived to make the total work of the system. The error rate of the system is the smallest when the rate is constant.
A single relay cooperative transmission technology based on digital fountain code is studied, and two coding methods are proposed. A distributed digital fountain code, DLT code (Decomposed Luby Transform codes, DLT), is proposed for the computation complexity and transmission delay of relay cooperative transmission. The two layer coding degree distribution function of the DLT code is designed and proposed. A cooperative communication transmission protocol based on DLT code is proposed. Compared with the existing non bit rate transmission, the scheme can effectively reduce the complexity of the relay nodes and the system transmission delay when the packet loss rate is large in each link. A new normalized variable node degree LT code coding method is proposed for the error platform error platform problem, which is saved by the method. The process of sorting, searching and updating the variable node degree table, reducing the coding complexity and using the correction of the degree distribution to improve the decoding waterfall area. Finally, the coding method is applied to the single relay cooperative communication system, and the false symbol rate is analyzed. Compared with the existing method, the method can save the system. In order to improve the frequency efficiency of the multi relay without code rate transmission, a kind of multi relay non bit rate cooperative transmission protocol based on network coding and relay selection is proposed. In order to improve the frequency efficiency of multi relay without code rate transmission, a relay set of successful decoding is first established. The relay selection strategy is used to select the best relay to participate in cooperation, while the source node sends the network coding information of the current message block and the next block of data, and the diversity gain and network coding gain can be obtained simultaneously. In addition, the quasi static Rayleigh fading channel is equivalent to the corresponding deletion channel, and the number of destination decode needs is derived. According to the probability mass function of the packet number and the average transmission times required for decoding, the effect of the relay set size on the system performance is discussed. Compared with the existing multi relay without code rate transmission scheme, this method can effectively reduce the average transmission times of the system and thus improve the transmission efficiency of the system.
【學(xué)位授予單位】：大連理工大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2014
【分類號(hào)】：TN929.5

【參考文獻(xiàn)】

相關(guān)期刊論文 前3條

1 彭聰;趙明;姚彥;;適用于無(wú)線網(wǎng)絡(luò)的動(dòng)態(tài)網(wǎng)絡(luò)編碼協(xié)作通信機(jī)制[J];清華大學(xué)學(xué)報(bào)(自然科學(xué)版);2008年07期

2 陳前斌;劉劍;酆勇;唐倫;;基于網(wǎng)絡(luò)編碼與空時(shí)編碼的協(xié)作MAC協(xié)議[J];通信學(xué)報(bào);2013年09期

3 孫立悅;趙曉暉;虢明;;基于中斷概率的協(xié)作通信中繼選擇與功率分配算法[J];通信學(xué)報(bào);2013年10期

相關(guān)博士學(xué)位論文 前5條

1 張鴻濤;無(wú)線網(wǎng)絡(luò)多用戶協(xié)作傳輸關(guān)鍵技術(shù)研究[D];北京郵電大學(xué);2008年

2 王荊寧;多用戶協(xié)作分集關(guān)鍵技術(shù)研究[D];哈爾濱工業(yè)大學(xué);2010年

3 郭輝;基于協(xié)作分集的無(wú)線通信技術(shù)研究[D];西安電子科技大學(xué);2012年

4 施玉晨;無(wú)線中繼系統(tǒng)中的編碼與協(xié)作傳輸技術(shù)研究[D];西安電子科技大學(xué);2012年

5 孫文珠;多媒體信號(hào)可伸縮編碼傳輸方法研究[D];大連理工大學(xué);2013年

，

本文編號(hào)：2003689