本文選題：星地一體化網(wǎng)絡(luò) + 同頻干擾��； 參考：《哈爾濱工業(yè)大學(xué)》2017年碩士論文

【摘要】：ITU(International Telecommunication Union)提出下一代網(wǎng)絡(luò)(Next Generation Network,NGN)能兼容現(xiàn)有的各種技術(shù),為用戶提供多樣的服務(wù)。星地一體化網(wǎng)絡(luò)作為下一代網(wǎng)絡(luò)的重要部分,是實(shí)現(xiàn)任何人(Anyone)在任何地方(Anywhere)、任何時(shí)候(Anytime)進(jìn)行任何業(yè)務(wù)(Anything)通信的高效解決方案,也是當(dāng)前學(xué)術(shù)界的研究熱點(diǎn)。因此,本文以用于衛(wèi)星移動(dòng)服務(wù)的S波段為切入點(diǎn),以星地一體化系統(tǒng)為載體,研究基于資源分配的干擾協(xié)調(diào)技術(shù)。首先,本文基于ITU對(duì)星地一體化網(wǎng)絡(luò)和混合星地網(wǎng)絡(luò)的相關(guān)定義,介紹衛(wèi)星IMT-Advanced(International Mobile Telecommunications-Advanced)系統(tǒng)的服務(wù)場(chǎng)景,結(jié)合具體的服務(wù)場(chǎng)景對(duì)星地一體化網(wǎng)絡(luò)以及混合星地網(wǎng)絡(luò)的體系架構(gòu)、工作原理進(jìn)行對(duì)照,梳理了星地一體化網(wǎng)絡(luò)的關(guān)鍵技術(shù)。此外,本文總結(jié)了星地一體化系統(tǒng)中的兩種資源分配方式,并簡(jiǎn)要介紹了自適應(yīng)資源分配原理及注水算法,為后續(xù)研究奠定理論基礎(chǔ)。其次,針對(duì)由星地頻譜共享技術(shù)引發(fā)的衛(wèi)星與地面組件的同頻干擾問題,本文首先分類歸納了所有的干擾場(chǎng)景,確定主要干擾路徑為衛(wèi)星上行鏈路。在此基礎(chǔ)上,提出了基于禁區(qū)的干擾協(xié)調(diào)方案,仿真結(jié)果顯示所提方案能明顯降低組件間干擾,增大系統(tǒng)容量。為了估計(jì)地面網(wǎng)絡(luò)可用帶寬,提出了基于干擾源位置的估計(jì)方法,根據(jù)禁區(qū)寬度及禁區(qū)重疊層數(shù)將地面終端分布位置分類,采用蒙特卡洛仿真和全概率公式計(jì)算地面網(wǎng)絡(luò)可用帶寬。仿真結(jié)果顯示禁區(qū)寬度增大會(huì)減少地面網(wǎng)絡(luò)的可用帶寬,因此應(yīng)充分權(quán)衡系統(tǒng)干擾大小和頻譜效率來(lái)決定禁區(qū)寬度。最后,本文提出了“衛(wèi)星-波束-用戶”的動(dòng)態(tài)資源分配算法。首先驗(yàn)證了現(xiàn)有的單一資源分配方案的有效性,針對(duì)其缺陷和不足,在衛(wèi)星-波束層面,提出了基于業(yè)務(wù)需求的功率帶寬聯(lián)合優(yōu)化分配算法,將波束間干擾、信道條件差異以及時(shí)延因素考慮進(jìn)資源分配模型,根據(jù)拉格朗日對(duì)偶理論和次梯度迭代的方法求得最優(yōu)解。所提算法能在有限資源的限制下盡可能滿足各點(diǎn)波束的業(yè)務(wù)需求,最大化系統(tǒng)總?cè)萘?根據(jù)各點(diǎn)波束的業(yè)務(wù)需求、信道環(huán)境自適應(yīng)分配資源。在波束-用戶層面,將點(diǎn)波束的容量作為該波束內(nèi)部用戶資源分配的容量上限,在混合業(yè)務(wù)場(chǎng)景下,提出了一種基于業(yè)務(wù)公平性和效用最大化的用戶資源分配算法。與傳統(tǒng)算法對(duì)比,該算法能最大化系統(tǒng)總效用,并且具有較好的靈活性和公平性。
[Abstract]:ITU (International Telecommunication Union) proposes that the next Generation Network (NGN) can be compatible with various existing technologies and provide users with various services. As an important part of the next generation network, the integrated satellite and earth network is an efficient solution to realize any service communication in any place, anywhere, anytime and anytime. It is also a hot research topic in current academic circles. Therefore, the interference coordination technology based on resource allocation is studied in this paper, which is based on the S-band used for satellite mobile service and the integrated satellite and earth system as the carrier. Firstly, based on ITU's definitions of integrated satellite and earth networks and hybrid satellite and earth networks, this paper introduces the service scenarios of the satellite IMT-Advanceden International Mobile Telecommunications Advanced system, and combines the specific service scenarios with the architecture of the integrated satellite and earth networks and the hybrid satellite to earth networks. The working principle is compared, and the key technology of the integrated satellite and earth network is combed out. In addition, this paper summarizes two ways of resource allocation in satellite and earth integrated system, and introduces the principle of adaptive resource allocation and water injection algorithm, which lays a theoretical foundation for further research. Secondly, aiming at the same frequency interference between satellite and ground components caused by the satellite and ground spectrum sharing technology, this paper firstly classifies all interference scenarios and determines the main jamming path is satellite uplink. On this basis, the interference coordination scheme based on restricted area is proposed. The simulation results show that the proposed scheme can significantly reduce inter-component interference and increase the system capacity. In order to estimate the available bandwidth of the ground network, an estimation method based on the location of the interference source is proposed. The location of the ground terminal is classified according to the width of the restricted area and the number of overlapped layers of the restricted area. The available bandwidth of ground network is calculated by Monte Carlo simulation and full probability formula. The simulation results show that increasing the width of the restricted area will reduce the available bandwidth of the ground network. Therefore, the system interference and spectral efficiency should be weighed to determine the width of the restricted area. Finally, a dynamic resource allocation algorithm for satellite-beam-user is proposed. Firstly, the effectiveness of the existing single resource allocation scheme is verified. Aiming at its shortcomings and shortcomings, a joint optimal allocation algorithm for power bandwidth based on service requirements is proposed in the satellite-beam level. Based on Lagrangian duality theory and subgradient iterative method, the optimal solution is obtained by considering the difference of channel conditions and delay factors. The proposed algorithm can satisfy the traffic requirements of each point beam as much as possible under the limitation of limited resources and maximize the total capacity of the system. According to the traffic requirements of each point beam, the channel environment adaptively allocates resources. At the beam-user level, the capacity of the point beam is taken as the upper limit of the user resource allocation within the beam. In the mixed service scenario, a user resource allocation algorithm based on the maximum service fairness and utility is proposed. Compared with the traditional algorithm, this algorithm can maximize the overall utility of the system, and has better flexibility and fairness.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TN927

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