无线传感器网络中协同ARQ系统性能建模研究

发布时间：2018-06-05 07:23

本文选题：无线传感器网络 + 协同ARQ系统　；参考：《兰州理工大学》2014年博士论文

【摘要】：无线传感器网络已成为我们生活中不可或缺的一部分。如何解决传感器节点在可靠性,有效性及能量受限等方面的挑战是无线传感器网络面临的非常实际的问题。协同ARQ因其能够有效的增加空间分集增益,同时又保证了数据传输的高可靠性而被无线传感器网络广泛采用。本文主要通过建立离散时间Markov链模型、离散时间Geom/G/1排队模型及能量效率模型,基于截短和中继选择思想,研究无线传感器网络中协同ARQ系统的稳态分布、吞吐量、时延及能量效率性能。概括总结如下：1.系统阐述了无线传感器网络中基本ARQ、多播协同ARQ、多中继协同ARQ、多源协同ARQ以及多源多中继协同ARQ系统的传输原理。考虑实际的工程应用,将影响ARQ系统性能的主要因素参数化。基于等效服务时间和等效休假时间思想,建立了经典离散时间Geom/G/1排队模型与带启动时间和随机休假的离散时间Geom/G/1排队模型,分别获得了各种ARQ系统的分组平均等待时延和信道利用率解析表达式。 2.考虑实际的通信网络背景,提出了N+2状态的离散时间Markov链一般模型,用以分析协同通信网络的分组传输过程。基于此模型,分别获得了无线传感器网络中多播协同ARQ、多中继协同ARQ、多源协同ARQ以及多源多中继协同ARQ系统的状态转移概率矩阵。进一步,通过求解平衡方程和正规化条件推导出了各自的稳态分布和系统吞吐量方程。 3.为了保证协同、多跳ARQ系统在无线传感器网络的实际应用中延迟和通信终端数据缓存的最小化,对系统的分组重传次数进行截短。求解出了无线传感器网络下非直达与可直达多中继协同截短ARQ以及多中继协同n步返回ARQ系统中一个数据分组被目的节点成功接收所需要的平均传输次数,进而获得了系统的平均分组传输时延表达式。通过数值模拟验证了截短的意义所在。为了最小化系统开销,将中继择优选择思想引入到无线传感器网络多中继协同ARQ系统中选择出最优中继进行协同传输。对无线传感器网络中基于中继选择的两跳截短ARQ和多中继协同截短ARQ系统的性能进行了分析。 4.基于M元调制,区别考虑源节点、中继节点和目的节点各自的功率消耗,提出了用于分析无线传感器网络中协同ARQ系统的能量效率模型。求解出了多播协同ARQ、非直达与可直达多中继协同截短ARQ、多中继协同n步返回ARQ、多源协同ARQ、多源多中继协同ARQ以及基于中继选择的两跳截短ARQ,多中继协同截短ARQ系统的能量效率解析表达式。 5.针对上述理论分析获得的解析表达式,通过数值模拟呈现本文所提协同ARQ系统的优越性。分析比较分组长度、中继节点数、功放损耗因子、截短数和重传概率等对系统性能的影响规律。给出了不同信道环境下应采用何种ARQ系统的理论建议。
[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.
【学位授予单位】：兰州理工大学
【学位级别】：博士
【学位授予年份】：2014
【分类号】：TN929.5;TP212.9

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