發(fā)布時間：2018-06-30 17:39

  本文選題：衛(wèi)星移動通信 + 衛(wèi)星信道�。� 參考：《解放軍信息工程大學(xué)》2014年碩士論文

【摘要】：衛(wèi)星移動通信系統(tǒng)具有覆蓋區(qū)域廣、室外信道質(zhì)量高、抗毀性強等優(yōu)點,被廣泛應(yīng)用于偏遠地區(qū)通信網(wǎng)絡(luò)建設(shè)、搶險救災(zāi)應(yīng)急通信、軍事通信等領(lǐng)域。隨著地面移動通信標準的不斷發(fā)展,自2011年以來國內(nèi)外的眾多研究機構(gòu)開展了以長期演進(Long Term Evolution:LTE)技術(shù)體制為基礎(chǔ)的新一代衛(wèi)星移動通信系統(tǒng)及其關(guān)鍵技術(shù)的廣泛研究。我國在十二五規(guī)劃中更是確立了建立我國自主衛(wèi)星LTE移動通信系統(tǒng)試驗網(wǎng)絡(luò)的建設(shè)目標。目前,針對LTE體制的衛(wèi)星環(huán)境適應(yīng)性改進技術(shù)研究成為這一領(lǐng)域的研究重點,本文的研究工作歸屬于這一范疇,重點研究了靜止軌道(Geostationary Earth Orbit:GEO)衛(wèi)星移動通信系統(tǒng)中下行鏈路聯(lián)合發(fā)送技術(shù)、上行定時同步技術(shù)和SIP(Session Initiation Protocol)會話控制協(xié)議的適應(yīng)性改進技術(shù),完成工作包括:1.針對衛(wèi)星移動通信與LTE通信體制相融合的關(guān)鍵技術(shù)問題展開分析,詳細闡述了本文所要研究的MIMO技術(shù)、OFDM技術(shù)和協(xié)議標準的適應(yīng)性改進問題,分別就衛(wèi)星LTE系統(tǒng)組成、載荷配置和協(xié)議展開分析,通過三種經(jīng)典的衛(wèi)星移動通信信道統(tǒng)計模型研究衛(wèi)星無線信道的傳播特性,結(jié)合地面MIMO信道容量研究成果給出衛(wèi)星LTE信道容量計算解析表達式,建立本文性能分析的理論基礎(chǔ);2.針對采用MIMO技術(shù)的GEO多波束衛(wèi)星LTE系統(tǒng)在同頻組網(wǎng)時,用戶數(shù)據(jù)隨機分布在子載波資源塊而形成隨機窄帶同頻干擾問題,首先構(gòu)建了GEO衛(wèi)星移動通信系統(tǒng)同頻組網(wǎng)的頻率復(fù)用小區(qū)模型,分析了該模型下多波束衛(wèi)星下行鏈路聯(lián)合發(fā)送技術(shù)的適應(yīng)性,然后以Lutz衛(wèi)星移動通信信道統(tǒng)計模型為基礎(chǔ)模型,提出一種基于Block-Diagonalization預(yù)編碼算法的下行聯(lián)合發(fā)送方法,理論分析及仿真結(jié)果表明,本文所提方法可使得用戶在波束邊緣區(qū)域獲得0.8~1.8bps/Hz的信道容量增益,且算法復(fù)雜度較低;3.針對衛(wèi)星大時延環(huán)境下定時誤差會破壞OFDM符號正交性的問題,首先對傳統(tǒng)衛(wèi)星定時同步技術(shù)展開分析,然后借鑒現(xiàn)有移動通信系統(tǒng)時延誤差估計方法的設(shè)計思想,通過設(shè)計閉環(huán)控制的定時誤差補償機制,提出一種基于LMS估計的上行定時同步優(yōu)化方法,仿真結(jié)果表明,本文所提方法在衛(wèi)星環(huán)境下能保證系統(tǒng)的上行定時同步精度滿足LTE標準的定時同步要求,且傳輸速率損失僅為9%,優(yōu)于現(xiàn)有方法。4.針對傳統(tǒng)SIP會話控制協(xié)議應(yīng)用于衛(wèi)星通信系統(tǒng)時會話建立時延過大的問題,首先參考SkyTerra衛(wèi)星系統(tǒng)通信系統(tǒng)結(jié)構(gòu)特點,然后引入P2PSIP技術(shù),構(gòu)建了基于分布式哈希表(Distributed Hash Table:DHT)結(jié)構(gòu)的衛(wèi)星P2P(Peer to Peer)覆蓋層重疊網(wǎng)絡(luò)模型,提出一種適用于GEO衛(wèi)星的P2PSIP會話控制機制,利用OPNET軟件進行性能仿真驗證,其結(jié)果表明,本文所提方法能有效減少會話建立過程中用戶與信關(guān)站間的信令交互次數(shù),減少用戶會話建立時延。
[Abstract]:The satellite mobile communication system has the advantages of wide coverage, high quality of outdoor channel and strong survivability. It has been widely used in remote area communication network construction, emergency communications, military communications and other fields. With the continuous development of terrestrial mobile communication standards, many research institutions at home and abroad have carried out extensive research on the new generation satellite mobile communication system and its key technologies based on long term Evolution: LTE (long term Evolution: LTE) technology system since 2011. In the 12th Five-Year Plan, China has established the goal of establishing the experimental network of autonomous satellite LTE mobile communication system. At present, the research of satellite environment adaptability improvement technology based on LTE system has become the focus of this field, and the research work in this paper belongs to this category. The technologies of joint downlink transmission, uplink timing synchronization and session initiation Protocol (SIP) session control protocol in Geostationary Earth Orbit: GEO satellite mobile communication system are studied in detail. Based on the analysis of the key technologies of the convergence of satellite mobile communication and LTE communication system, the adaptive improvement problems of MIMO technology and protocol standard are discussed in detail in this paper. Respectively, the composition of satellite LTE system is discussed. Based on the load configuration and protocol analysis, the propagation characteristics of satellite wireless channel are studied by three classical statistical models of satellite mobile communication channel, and the analytical expression of satellite LTE channel capacity is given based on the research results of terrestrial MIMO channel capacity. The theoretical basis of performance analysis in this paper is established. For GEO multi-beam satellite LTE system with MIMO technology, the random narrowband interference problem is formed when the user data is randomly distributed in the sub-carrier resource block in the same frequency network, so as to solve the problem of random narrowband co-frequency interference in GEO multi-beam satellite LTE system using MIMO technology. Firstly, the frequency multiplexing cell model of GEO satellite mobile communication system is constructed, and the adaptability of multi-beam satellite downlink joint transmission technology under this model is analyzed. Then, the statistical model of Lutz satellite mobile communication channel is used as the basic model. A joint downlink transmission method based on Block-Diagonalization precoding algorithm is proposed. The theoretical analysis and simulation results show that the proposed method can obtain a channel capacity gain of 0.8 ~ 1.8bps-Hz in the edge region of the beam, and the complexity of the algorithm is low. Aiming at the problem that timing error will destroy the orthogonality of OFDM symbols in the environment of large satellite time delay, the traditional satellite timing synchronization technology is analyzed firstly, and then the design idea of the existing methods of time delay error estimation in mobile communication system is used for reference. By designing the timing error compensation mechanism of closed-loop control, a timing synchronization optimization method based on LMS estimation is proposed. The simulation results show that, The method proposed in this paper can ensure the uplink timing synchronization accuracy of the system meets the LTE standard timing synchronization requirements in satellite environment, and the transmission rate loss is only 9, which is superior to the existing methods. 4. Aiming at the problem of excessive delay of session establishment when traditional SIP session control protocol is applied to satellite communication system, firstly referring to the structural characteristics of SkyTerra satellite communication system, then introducing P2PSIP technology. A P2P (Peer to Peer) overlay network model based on distributed hash table (DHT) architecture is constructed. A P2PSIP session control mechanism suitable for GEO satellite is proposed. The performance is verified by OPNET software. The method proposed in this paper can effectively reduce the number of signalling interactions between the user and the signalling station during the session establishment process and reduce the user session establishment delay.
【學(xué)位授予單位】：解放軍信息工程大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TN927.23

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