發(fā)布時間：2018-06-05 07:23

  本文選題：無線傳感器網絡 + 協同ARQ系統(tǒng)　； 參考：《蘭州理工大學》2014年博士論文

【摘要】：無線傳感器網絡已成為我們生活中不可或缺的一部分。如何解決傳感器節(jié)點在可靠性,有效性及能量受限等方面的挑戰(zhàn)是無線傳感器網絡面臨的非常實際的問題。協同ARQ因其能夠有效的增加空間分集增益,同時又保證了數據傳輸的高可靠性而被無線傳感器網絡廣泛采用。本文主要通過建立離散時間Markov鏈模型、離散時間Geom/G/1排隊模型及能量效率模型,基于截短和中繼選擇思想,研究無線傳感器網絡中協同ARQ系統(tǒng)的穩(wěn)態(tài)分布、吞吐量、時延及能量效率性能。概括總結如下：1.系統(tǒng)闡述了無線傳感器網絡中基本ARQ、多播協同ARQ、多中繼協同ARQ、多源協同ARQ以及多源多中繼協同ARQ系統(tǒng)的傳輸原理�？紤]實際的工程應用,將影響ARQ系統(tǒng)性能的主要因素參數化�；诘刃Х⻊諘r間和等效休假時間思想,建立了經典離散時間Geom/G/1排隊模型與帶啟動時間和隨機休假的離散時間Geom/G/1排隊模型,分別獲得了各種ARQ系統(tǒng)的分組平均等待時延和信道利用率解析表達式。 2.考慮實際的通信網絡背景,提出了N+2狀態(tài)的離散時間Markov鏈一般模型,用以分析協同通信網絡的分組傳輸過程�；诖四Ｐ�,分別獲得了無線傳感器網絡中多播協同ARQ、多中繼協同ARQ、多源協同ARQ以及多源多中繼協同ARQ系統(tǒng)的狀態(tài)轉移概率矩陣。進一步,通過求解平衡方程和正規(guī)化條件推導出了各自的穩(wěn)態(tài)分布和系統(tǒng)吞吐量方程。 3.為了保證協同、多跳ARQ系統(tǒng)在無線傳感器網絡的實際應用中延遲和通信終端數據緩存的最小化,對系統(tǒng)的分組重傳次數進行截短。求解出了無線傳感器網絡下非直達與可直達多中繼協同截短ARQ以及多中繼協同n步返回ARQ系統(tǒng)中一個數據分組被目的節(jié)點成功接收所需要的平均傳輸次數,進而獲得了系統(tǒng)的平均分組傳輸時延表達式。通過數值模擬驗證了截短的意義所在。為了最小化系統(tǒng)開銷,將中繼擇優(yōu)選擇思想引入到無線傳感器網絡多中繼協同ARQ系統(tǒng)中選擇出最優(yōu)中繼進行協同傳輸。對無線傳感器網絡中基于中繼選擇的兩跳截短ARQ和多中繼協同截短ARQ系統(tǒng)的性能進行了分析。 4.基于M元調制,區(qū)別考慮源節(jié)點、中繼節(jié)點和目的節(jié)點各自的功率消耗,提出了用于分析無線傳感器網絡中協同ARQ系統(tǒng)的能量效率模型。求解出了多播協同ARQ、非直達與可直達多中繼協同截短ARQ、多中繼協同n步返回ARQ、多源協同ARQ、多源多中繼協同ARQ以及基于中繼選擇的兩跳截短ARQ,多中繼協同截短ARQ系統(tǒng)的能量效率解析表達式。 5.針對上述理論分析獲得的解析表達式,通過數值模擬呈現本文所提協同ARQ系統(tǒng)的優(yōu)越性。分析比較分組長度、中繼節(jié)點數、功放損耗因子、截短數和重傳概率等對系統(tǒng)性能的影響規(guī)律。給出了不同信道環(huán)境下應采用何種ARQ系統(tǒng)的理論建議。
[Abstract]:Wireless sensor networks have become an indispensable part of our lives. How to solve the challenges of sensor nodes in terms of reliability, effectiveness and energy constraints is a very practical problem for wireless sensor networks (WSN). Cooperative ARQ is widely used in wireless sensor networks because it can effectively increase spatial diversity gain and ensure the high reliability of data transmission. In this paper, the steady-state distribution and throughput of cooperative ARQ systems in wireless sensor networks are studied by establishing discrete time Markov chain model, discrete time Geom/G/1 queuing model and energy efficiency model, based on truncation and relay selection ideas. Delay and energy efficiency performance. The summary is as follows: 1. The transmission principles of basic ARQs, multicast cooperative ARQs, multi-relay cooperative ARQs, multi-source cooperative ARQ systems and multi-source multi-relay cooperative ARQ systems in wireless sensor networks are systematically described. Considering the practical engineering application, the main factors affecting the performance of ARQ system are parameterized. Based on the idea of equivalent service time and equivalent vacation time, the classical discrete time Geom/G/1 queuing model and the discrete time Geom/G/1 queuing model with startup time and random vacation are established. The analytical expressions of packet average waiting delay and channel utilization for various ARQ systems are obtained respectively. 2. Considering the actual communication network background, a general discrete time Markov chain model of N2 state is proposed to analyze the packet transmission process of cooperative communication networks. Based on this model, the state transition probability matrices of multicast cooperative ARQs, multi-relay cooperative ARQs, multi-source cooperative ARQ systems and multi-source multi-relay cooperative ARQ systems in wireless sensor networks are obtained. Furthermore, the steady-state distribution and system throughput equations are derived by solving equilibrium equations and regularization conditions. 3. In order to ensure cooperation, the delay of multi-hop ARQ system and the minimization of communication terminal data cache in practical application of wireless sensor network, the packet retransmission times of the system are truncated. The average number of times of transmission required for a data packet to be successfully received by the destination node in the ARQ system is solved by solving the non-direct and direct-to-direct multi-relay cooperative truncated ARQ and the multi-relay cooperative n-step return in the wireless sensor network. Then the expression of average packet transmission delay is obtained. The significance of truncation is verified by numerical simulation. In order to minimize system overhead, the idea of relay selection is introduced into wireless sensor network multi-relay cooperative ARQ systems to select the optimal relay for cooperative transmission. The performance of two-hop truncated ARQ and multi-relay cooperative truncated ARQ systems based on relay selection in wireless sensor networks is analyzed. 4. Based on M-element modulation and considering the power consumption of source node, relay node and destination node, an energy efficiency model for analyzing cooperative ARQ system in wireless sensor networks is proposed. Multicast cooperative ARQs, non-direct and direct multi-relay cooperative truncated ARQs, multi-relay cooperative n-step ARQs, multi-source cooperative ARQs, multi-source multi-relay cooperative ARQs, two-hop truncated ARQs based on relay selection and multi-relay cooperative truncated ARQ systems are solved. The analytical expression of energy efficiency of the system. 5. According to the analytical expressions obtained from the above theoretical analysis, the advantages of the cooperative ARQ system proposed in this paper are presented by numerical simulation. The effects of packet length, relay node number, power amplifier loss factor, truncation number and retransmission probability on the performance of the system are analyzed and compared. The theoretical suggestions of which ARQ systems should be adopted in different channel environments are given.
【學位授予單位】：蘭州理工大學
【學位級別】：博士
【學位授予年份】：2014
【分類號】：TN929.5;TP212.9

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本文編號：1981150