本文選題：D2D通信 + 聯(lián)合資源分配��； 參考：《山東大學(xué)》2017年碩士論文

【摘要】：智能移動設(shè)備的普及為現(xiàn)代生活帶來方便的同時也造成頻譜資源匱乏的現(xiàn)狀。為提高傳統(tǒng)蜂窩網(wǎng)絡(luò)的頻譜利用率,鄰近用戶通過重用蜂窩頻譜直接傳輸信息的非正交模式終端直通(device-to-device,D2D)通信技術(shù)引起研究人員的關(guān)注。如何將頻譜資源塊、功率等資源合理地分配給蜂窩用戶與D2D用戶,提高整個蜂窩D2D通信系統(tǒng)的傳輸速率與資源利用率,是資源分配策略研究的重點。另一方面,由于網(wǎng)絡(luò)環(huán)境的惡化和移動用戶數(shù)量的增多,網(wǎng)絡(luò)安全問題變得日益重要;而通信系統(tǒng)自身或外部環(huán)境的限制使得信道參數(shù)的不確定性普遍存在,信道狀態(tài)信息不完全可知時的魯棒資源分配問題成為研究的熱點之一。因此,針對非正交模式的蜂窩網(wǎng)絡(luò)下的D2D通信系統(tǒng),論文分別在理想信道狀況無竊聽和有竊聽以及非理想信道狀況無竊聽的場景下,兼顧蜂窩子系統(tǒng)與D2D子系統(tǒng)的性能,進行問題規(guī)劃和求解,并對提出的資源分配策略進行仿真分析。論文的主要工作如下:(1)簡述蜂窩D2D通信系統(tǒng)資源分配研究的相關(guān)背景及數(shù)學(xué)理論基礎(chǔ),主要包含D2D通信技術(shù)、物理層安全、魯棒性優(yōu)化、凸優(yōu)化理論等。(2)在信道狀態(tài)信息完全可知的狀況下,分別研究D2D通信系統(tǒng)無竊聽和有竊聽的聯(lián)合資源分配問題。以最大化D2D子系統(tǒng)的非保密速率和或保密速率和為目標函數(shù),兼顧蜂窩子系統(tǒng)的速率服務(wù)質(zhì)量要求,聯(lián)合優(yōu)化蜂窩及D2D用戶的功率與資源塊分配,建立優(yōu)化問題。進一步,把混合整數(shù)非線性的優(yōu)化問題轉(zhuǎn)變成凸子問題,采用拉格朗日對偶方法求得凸子問題的閉式解,并采用一維搜索方法得到原優(yōu)化問題的最優(yōu)解。基于以上研究,仿真分析提出的聯(lián)合資源分配策略的優(yōu)越性,并研究考慮D2D通信安全對系統(tǒng)性能帶來的影響。(3)在信道狀態(tài)信息不完全可知的非理想信道狀況下,研究無竊聽時蜂窩D2D通信系統(tǒng)的聯(lián)合資源分配問題。采用魯棒性優(yōu)化方法,將信道狀態(tài)信息中不確定的部分表示為其精確值與估計值間的有界距離,構(gòu)造相應(yīng)的魯棒性優(yōu)化問題。該問題中包含兩類不確定參數(shù),分別存在于目標函數(shù)與限制條件中。針對這兩類不確定參數(shù),論文把原魯棒性問題分解為兩部分,并采用最壞情況魯棒性優(yōu)化方法分別進行求解。為減少最壞情況魯棒性優(yōu)化方法產(chǎn)生的代價,利用機會限制方法實現(xiàn)魯棒性與最優(yōu)性的折衷。進一步,通過敏感度分析,研究保護函數(shù)如何對D2D子系統(tǒng)的和速率產(chǎn)生影響,并且利用數(shù)值仿真分析考慮魯棒性時系統(tǒng)性能受到的影響。
[Abstract]:The popularity of intelligent mobile devices not only brings convenience to modern life, but also results in the scarcity of spectrum resources. In order to improve the spectrum efficiency of traditional cellular networks, non-orthogonal mode terminals (NCPTs), which reuse cellular spectrum to transmit information directly, have attracted the attention of researchers. How to allocate the spectrum resource blocks and power to the cellular and D2D users reasonably and improve the transmission rate and resource utilization ratio of the whole cellular D2D communication system is the focus of the research on resource allocation strategy. On the other hand, due to the deterioration of the network environment and the increase of the number of mobile users, the network security problem becomes increasingly important, and the limits of the communication system itself or the external environment make the uncertainty of channel parameters widespread. The problem of robust resource allocation when the channel state information is not fully known has become one of the hot topics. Therefore, for the D2D communication system under non-orthogonal mode cellular network, the performance of cellular subsystem and D2D subsystem are considered in the scenario of no eavesdropping and eavesdropping in ideal channel condition and no eavesdropping in non-ideal channel condition, respectively. Problem planning and solution are carried out, and the proposed resource allocation strategy is simulated and analyzed. The main work of this paper is as follows: (1) the background and mathematical theory of the research on resource allocation of cellular D2D communication system are briefly described, including D2D communication technology, physical layer security, robustness optimization, etc. Convex optimization theory et al. (2) under the condition that the channel state information is completely known, the joint resource allocation problem without eavesdropping and eavesdropping in D2D communication systems is studied respectively. The objective function is to maximize the unsecure rate and or the secure rate sum of the D2D subsystem, and to consider the rate quality of service requirements of the cellular subsystem, and to jointly optimize the power and resource block allocation of the cellular and D2D users, so as to establish the optimization problem. Furthermore, the mixed integer nonlinear optimization problem is transformed into convex subproblem, the closed solution of convex subproblem is obtained by Lagrange duality method, and the optimal solution of the original optimization problem is obtained by one-dimensional search method. Based on the above research, the superiority of the proposed joint resource allocation strategy is analyzed by simulation, and the influence of D2D communication security on system performance is studied. The joint resource allocation problem of cellular D2D communication system without eavesdropping is studied. The uncertain part of the channel state information is represented as the bounded distance between the exact value and the estimated value by using the robustness optimization method, and the corresponding robustness optimization problem is constructed. There are two kinds of uncertain parameters in the problem, which exist in the objective function and the restriction condition, respectively. For these two kinds of uncertain parameters, the original robustness problem is decomposed into two parts, and the worst-case robustness optimization method is used to solve the problem separately. In order to reduce the cost of the worst-case robust optimization method, a tradeoff between robustness and optimality is achieved by using the opportunity-constrained method. Furthermore, through sensitivity analysis, the effect of protection function on the sum rate of D2D subsystem is studied, and the system performance is analyzed by numerical simulation when robustness is considered.
【學(xué)位授予單位】：山東大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TN929.5

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