無線傳感器網絡中基于協(xié)作通信的MAC協(xié)議研究
發(fā)布時間：2018-12-10 08:41
【摘要】：傳感器網絡與協(xié)作通信的結合,可以將傳感器節(jié)點、物理層技術和無線信道等結合起來,并進一步地研究優(yōu)化,得以有效地提高整個無線傳感器網的頻譜利用率及系統(tǒng)性能,而和傳統(tǒng)協(xié)議設計的差異在于,需要了解系統(tǒng)中各層間的相關性。本文中,主要進行在節(jié)點能量有限的無線傳感器網絡中,基于中繼選擇與功率分配算法優(yōu)化的協(xié)作MAC協(xié)議有關生命周期方面的研究。首先針對傳統(tǒng)的中繼選擇策略中鏈路信息不足及功率資源利用低等問題,在無線傳感器網絡場景中,提出基于解碼轉發(fā)方式的中繼選擇與功率分配策略,以達到最小化系統(tǒng)發(fā)射功率的目的。在最大發(fā)射功率、平均誤比特率及最大信道信噪比限制下,對候選中繼節(jié)點進行最優(yōu)功率分配,并根據傳輸距離和對應的能量消耗完成中繼選擇,以降低能耗,提升網絡壽命。其次,在節(jié)點能量受限的無線傳感器網絡中,綜合速率因素和功率因素,提出基于多中繼節(jié)點優(yōu)化的協(xié)作MAC協(xié)議,該協(xié)議依據本文提出的中繼選擇算法,先將選擇出的中繼節(jié)點加入初始的中繼集。獲得初始的中繼集之后,進行多中繼優(yōu)化得到最優(yōu)的協(xié)作集。仿真結果可得出,提出的基于多中繼優(yōu)化的協(xié)作MAC協(xié)議可有效延伸網絡生命周期,減少節(jié)點能量損耗。
[Abstract]:The combination of sensor network and cooperative communication can combine sensor node, physical layer technology and wireless channel, and further study optimization, which can effectively improve the spectrum efficiency and system performance of the whole wireless sensor network. The difference with the traditional protocol design is that we need to understand the correlation between the different layers of the system. In this paper, the life cycle of cooperative MAC protocol based on relay selection and power allocation algorithm optimization is studied in wireless sensor networks with limited node energy. Firstly, aiming at the problems of lack of link information and low utilization of power resources in traditional relay selection strategy, a relay selection and power allocation strategy based on decoding and forwarding is proposed in wireless sensor network scenarios. In order to minimize the transmission power of the system. Under the limitation of the maximum transmit power, average bit error rate and maximum channel signal-to-noise ratio, the optimal power allocation is carried out for the candidate relay nodes, and the relay selection is completed according to the transmission distance and the corresponding energy consumption, so as to reduce the energy consumption and improve the network life. Secondly, in wireless sensor networks with limited node energy, a cooperative MAC protocol based on multi-relay node optimization is proposed by synthesizing rate and power factors, which is based on the relay selection algorithm proposed in this paper. First, the selected relay node is added to the initial relay set. After the initial relay set is obtained, the optimal cooperative set is obtained by multi-relay optimization. The simulation results show that the proposed cooperative MAC protocol based on multi-relay optimization can effectively extend the network life cycle and reduce node energy loss.
【學位授予單位】：南京郵電大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TN929.5;TP212.9
本文編號：2370299
[Abstract]:The combination of sensor network and cooperative communication can combine sensor node, physical layer technology and wireless channel, and further study optimization, which can effectively improve the spectrum efficiency and system performance of the whole wireless sensor network. The difference with the traditional protocol design is that we need to understand the correlation between the different layers of the system. In this paper, the life cycle of cooperative MAC protocol based on relay selection and power allocation algorithm optimization is studied in wireless sensor networks with limited node energy. Firstly, aiming at the problems of lack of link information and low utilization of power resources in traditional relay selection strategy, a relay selection and power allocation strategy based on decoding and forwarding is proposed in wireless sensor network scenarios. In order to minimize the transmission power of the system. Under the limitation of the maximum transmit power, average bit error rate and maximum channel signal-to-noise ratio, the optimal power allocation is carried out for the candidate relay nodes, and the relay selection is completed according to the transmission distance and the corresponding energy consumption, so as to reduce the energy consumption and improve the network life. Secondly, in wireless sensor networks with limited node energy, a cooperative MAC protocol based on multi-relay node optimization is proposed by synthesizing rate and power factors, which is based on the relay selection algorithm proposed in this paper. First, the selected relay node is added to the initial relay set. After the initial relay set is obtained, the optimal cooperative set is obtained by multi-relay optimization. The simulation results show that the proposed cooperative MAC protocol based on multi-relay optimization can effectively extend the network life cycle and reduce node energy loss.
【學位授予單位】：南京郵電大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TN929.5;TP212.9
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，本文編號：2370299
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