【摘要】：無線傳感器網(wǎng)絡(luò)在飛速發(fā)展和廣泛使用的同時,也面臨著抗衰落性差和如何可靠傳輸?shù)膯栴}。多跳中繼技術(shù)可以有效地減少由于信道衰落所造成的無線通信的負面問題,因而在無線網(wǎng)絡(luò)中被廣泛應(yīng)用。本文以瑞麗衰落信道為背景,通過建立離散時間的Markov鏈模型、能量效率模型,使用Matlab等工具,研究多跳ARQ系統(tǒng)的穩(wěn)態(tài)分布、吞吐量性能、能效性能。本文的主要研究成果如下:首先通過建立多跳ARQ系統(tǒng)的三狀態(tài)Markov鏈模型,分析和比較了多跳ARQ系統(tǒng)中全部中繼節(jié)點丟包、部分中繼節(jié)點丟包、中繼節(jié)點不丟包三種狀況下通信系統(tǒng)的吞吐量性能,得到結(jié)論:中繼節(jié)點不丟包時,ARQ系統(tǒng)吞吐量性能最優(yōu);而全部中繼節(jié)點丟包時,ARQ系統(tǒng)吞吐量性能最差。數(shù)值模擬顯示理論分析和實際仿真得到的系統(tǒng)的吞吐量性能基本一致。其次通過建立多跳ARQ系統(tǒng)的能效模型,計算和比較了中繼節(jié)點丟包與不丟包兩種狀況下通信系統(tǒng)的能效性能。得到結(jié)論:中繼節(jié)點不丟包時,ARQ系統(tǒng)能效性能更優(yōu)。通過數(shù)值模擬進一步驗證了我們的結(jié)論的正確性。最后通過介紹多中繼協(xié)同ARQ系統(tǒng)的吞吐量的分析過程,將其分析方法提煉和總結(jié)為“中繼聚合”,并將使用該方法求解吞吐量的過程歸納為了三步。通過對多跳中繼的再次闡述,本文將“中繼聚合法”推廣到了多跳ARQ系統(tǒng)的吞吐量的求解問題上,從不同的角度對多跳ARQ系統(tǒng)的吞吐量進行了分析,而且得到了較理想的結(jié)果。證實了多中繼ARQ系統(tǒng)的吞吐量性能的分析過程和多跳ARQ系統(tǒng)的吞吐量性能的分析過程存在著共同的方法,有利于在分析這兩種協(xié)同ARQ協(xié)議的某些性能時的統(tǒng)籌規(guī)劃。
[Abstract]:With the rapid development and wide use of wireless sensor networks, wireless sensor networks also face the problems of poor anti-fading and reliable transmission. Multi-hop relay technology is widely used in wireless networks because it can effectively reduce the negative problems of wireless communication caused by channel fading. In this paper, based on Rayleigh fading channel, discrete time Markov chain model, energy efficiency model and Matlab are used to study the steady-state distribution, throughput performance and energy efficiency performance of multi-hop ARQ systems. The main research results of this paper are as follows: firstly, by establishing the three-state Markov chain model of multi-hop ARQ system, we analyze and compare the packet loss of all relay nodes and partial relay nodes in multi-hop ARQ system. It is concluded that the throughput performance of the ARQ system is the best when the relay node does not lose the packet, and the throughput performance of the ARQ system is the worst when all the relay nodes lose the packet. Numerical simulation shows that the throughput performance of the system obtained by theoretical analysis is basically consistent with that obtained by practical simulation. Secondly, the energy efficiency model of multi-hop ARQ system is established to calculate and compare the energy efficiency performance between relay node packet loss and non-packet loss. It is concluded that the energy efficiency performance of ARQ system is better when the relay node does not lose packets. The correctness of our conclusion is further verified by numerical simulation. Finally, by introducing the throughput analysis process of multi-relay cooperative ARQ system, the analysis method is abstracted and summarized as "relay aggregation", and the process of using this method to solve throughput is summed up as three steps. In this paper, the method of relay aggregation is extended to solve the throughput of multi-hop ARQ system. The throughput of multi-hop ARQ system is analyzed from different angles, and the ideal results are obtained. It is proved that there are common methods for analyzing the throughput performance of multi-relay ARQ systems and multi-hop ARQ systems, which is beneficial to the overall planning of some performances of these two cooperative ARQ protocols.
【學(xué)位授予單位】：蘭州理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TP212.9;TN929.5

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