無線網(wǎng)絡(luò)中的分布式機會信道接入研究
發(fā)布時間：2018-10-10 15:58
【摘要】：隨著當今無線通信與移動互聯(lián)網(wǎng)產(chǎn)業(yè)的蓬勃發(fā)展,高速數(shù)據(jù)傳輸成了未來通信業(yè)務(wù)發(fā)展的一個核心方向。然而,由于可用的頻譜資源日益緊缺,導致了高速數(shù)據(jù)傳輸技術(shù)的研究面臨瓶頸。因此,如何更合理地分配以及更有效地利用現(xiàn)有的頻譜資源,成為解決頻譜資源緊缺的一個突破口。在這種情形下,一種能夠有效地提高頻譜資源利用率的機會式信道接入技術(shù)應(yīng)運而生。機會式信道接入是一種結(jié)合PHY層和MAC層的跨層信道接入?yún)f(xié)議,在進行信道接入決策時,系統(tǒng)根據(jù)信道狀態(tài)的好壞決定是否接入信道。在集中式網(wǎng)絡(luò)中,中心控制節(jié)點能夠獲取全局狀態(tài)信息,因此機會信道接入對集中式網(wǎng)絡(luò)尤其適用,并且基于該領(lǐng)域的研究也取得了很多成果。然而,由于分布式網(wǎng)絡(luò)中不存在中心控制節(jié)點,機會信道接入在這種特定網(wǎng)絡(luò)下的研究還處于初步發(fā)展階段�；谏鲜稣J識,本文將此方向作為研究重點。本文的主要工作及貢獻如下:1.研究了連續(xù)傳輸速率下DF中繼網(wǎng)絡(luò)中的分布式機會信道接入。連續(xù)傳輸速率是指系統(tǒng)采用信道所能提供的最大速率進行傳輸。在最優(yōu)停止理論的指導下,以最大化系統(tǒng)平均吞吐率為目標,首先給出了需要獲取DF兩跳信道信息的完全信道接入策略。由于DF中繼網(wǎng)絡(luò)中系統(tǒng)的總體信噪比由兩跳中較小的決定,又提出了只需獲取第一跳信道信息即可進行決策的部分信道接入策略。相較于完全信道接入策略,該策略可以節(jié)約信道探測時間,進而改善系統(tǒng)性能。為了更充分地利用時間分集所提供的性能增益,又研究了在多個信道相干時間內(nèi)傳輸?shù)闹欣^等待策略。根據(jù)部分信道接入策略與中繼等待策略的特點,提出了結(jié)合各自優(yōu)勢的混合雙層信道接入策略。上述四種策略均為在實際應(yīng)用中簡單易行的純門限策略,門限由快速收斂且計算復雜度較低的迭代算法得出。仿真結(jié)果分析了策略之間的性能增益,并證明了所提理論算法的可靠性。2.在固定中繼與非固定中繼兩種場景下,研究了離散傳輸速率下DF中繼網(wǎng)絡(luò)中的分布式機會信道接入。離散傳輸速率是指系統(tǒng)采用特定的離散傳輸速率集內(nèi)的元素進行傳輸。由于離散傳輸速率的特有結(jié)構(gòu),最優(yōu)接入策略的求解與在連續(xù)傳輸速率下的求解存在較大差異。此外,連續(xù)傳輸速率下非固定中繼系統(tǒng)的機會信道接入研究面臨一定困難,因此,離散速率下非固定中繼系統(tǒng)的研究成果對連續(xù)速率下的相關(guān)研究具有重要的啟示意義。在固定中繼DF協(xié)作網(wǎng)絡(luò)中,首先提出了離散傳輸速率下的完全信道與部分信道接入策略。隨后,利用離散傳輸速率的特性,提出了對系統(tǒng)性能有重大改善的增強型中繼等待策略。最后研究了結(jié)合部分信道接入策略與增強型中繼等待策略的增強型混合雙層信道接入策略。在非固定中繼DF協(xié)作網(wǎng)絡(luò)中,分別提出了離散傳輸速率下的完全信道接入策略、部分信道接入策略以及增強型中繼等待策略。上述各項策略均為計算復雜度較低的純門限法則。仿真結(jié)果體現(xiàn)了上述各項策略之間的性能增益,并驗證了所提理論算法的可靠性。3.研究了引入隊列狀態(tài)信息后,隊列穩(wěn)定約束下Ad-hoc網(wǎng)絡(luò)中的分布式機會信道接入。首先給出了充分數(shù)據(jù)下的信道接入策略,隨后提出了實際傳輸數(shù)據(jù)下的信道接入策略。為了更進一步保證隊列的穩(wěn)定性,又提出基于Lyapunov算法的信道接入策略。該策略將結(jié)合信道信息與隊列信息的信道接入建模為一個約束優(yōu)化模型,利用Lyapunov優(yōu)化理論將其轉(zhuǎn)化為一個無約束優(yōu)化問題,并采用最優(yōu)停止理論對其進行求解。最后,提出了實際傳輸數(shù)據(jù)下基于Lyapunov算法的信道接入策略,該策略通過將實際傳輸數(shù)據(jù)引入目標函數(shù),使得系統(tǒng)平均吞吐率與隊列穩(wěn)定性均得到了進一步提高。以上各項策略均遵循純門限法則。仿真結(jié)果有效地驗證了所提策略的可靠性。
[Abstract]:With the rapid development of wireless communication and mobile Internet industry, high-speed data transmission becomes a core direction of future communication service development. However, due to the shortage of available spectrum resources, the research of high-speed data transmission technology is facing the bottleneck. Therefore, how to allocate more reasonably and effectively utilize the existing spectrum resources becomes a breakthrough to solve the shortage of spectrum resources. In this case, an opportunistic channel access technology that can efficiently improve the utilization of spectrum resources has emerged. opportunistic channel access is a cross-layer channel access protocol that combines the phy layer and the mac layer and determines whether to access the channel according to the quality of the channel state when the channel access decision is made. In a centralized network, the central control node is able to acquire global status information, so opportunistic channel access is particularly applicable to a centralized network, and a number of results have been achieved based on the research in this field. However, due to the absence of a central control node in the distributed network, the research of opportunistic channel access under this particular network is still at a preliminary stage of development. Based on the above knowledge, this paper focuses on this orientation. The main work and contribution of this paper are as follows: 1. Distributed opportunistic channel access in DF relay network under continuous transmission rate is studied. The continuous transmission rate refers to the maximum rate that the system can provide with a channel. Under the guidance of the optimal stopping theory to maximize the average throughput rate of the system, the complete channel access strategy for obtaining the DF two-hop channel information is given. because the overall signal-to-noise ratio of the system in the DF relay network is determined by a small decision in two hops, a partial channel access strategy of decision-making only needs to be obtained by acquiring the first hop channel information. Compared with the full-channel access strategy, the strategy can save the channel detection time and improve the performance of the system. In order to sufficiently utilize the performance gain provided by the time diversity set, a relay latency strategy for transmission over a plurality of channel coherence times is also investigated. According to the characteristics of partial channel access strategy and relay waiting strategy, a hybrid double-layer channel access strategy combining the advantages is proposed. The above four strategies are pure threshold strategy which is simple and feasible in practical application, and the threshold is obtained by iterative algorithm with fast convergence and lower computational complexity. The simulation results show the performance gain between the strategies and prove the reliability of the proposed algorithm. Distributed opportunistic channel access in DF relay network at discrete transmission rate is studied in two scenarios of fixed relay and non-fixed relay. A discrete transmission rate means that the system uses elements within a particular set of discrete transmission rates for transmission. Due to the unique structure of the discrete transmission rate, the solution of the optimal access strategy and the solution of the continuous transmission rate differ greatly. In addition, the research on opportunistic channel access of non-fixed relay system at continuous transmission rate is confronted with some difficulties. Therefore, the research results of the non-fixed relay system at discrete rate are of great significance to relevant research at continuous rate. In the fixed relay DF cooperative network, the complete channel and partial channel access strategy under the discrete transmission rate are first proposed. Then, using the characteristics of the discrete transmission rate, an enhanced relay waiting strategy with significant improvement on the performance of the system is proposed. Finally, the enhanced hybrid double-layer channel access strategy combining partial channel access policy and enhanced relay waiting strategy is studied. In the non-fixed relay DF cooperative network, the complete channel access strategy, partial channel access strategy and enhanced relay waiting strategy under the discrete transmission rate are presented. All these strategies are pure threshold rules with lower computational complexity. The simulation results show the performance gain between the above strategies, and verify the reliability of the proposed algorithm. Distributed opportunistic channel access in Ad-hoc networks is constrained by queue stability after introducing queue status information. Firstly, the channel access strategy under sufficient data is given, and then the channel access strategy under actual transmission data is proposed. In order to further ensure the stability of the queue, a channel access strategy based on Lyapunov algorithm is proposed. The strategy combines channel information and channel access of queue information into a constrained optimization model, transforms it into an unconstrained optimization problem by using Lyapunov optimization theory, and solves the problem by using the optimal stopping theory. Finally, we propose a channel access strategy based on Lyapunov algorithm under actual transmission data, which introduces the actual transmission data into the target function, so that the average throughput rate and queue stability of the system are further improved. All the above strategies comply with the rules of pure threshold. The simulation result effectively verifies the reliability of the proposed strategy.
【學位授予單位】：西安電子科技大學
【學位級別】：博士
【學位授予年份】：2016
【分類號】：TN92
[Abstract]:With the rapid development of wireless communication and mobile Internet industry, high-speed data transmission becomes a core direction of future communication service development. However, due to the shortage of available spectrum resources, the research of high-speed data transmission technology is facing the bottleneck. Therefore, how to allocate more reasonably and effectively utilize the existing spectrum resources becomes a breakthrough to solve the shortage of spectrum resources. In this case, an opportunistic channel access technology that can efficiently improve the utilization of spectrum resources has emerged. opportunistic channel access is a cross-layer channel access protocol that combines the phy layer and the mac layer and determines whether to access the channel according to the quality of the channel state when the channel access decision is made. In a centralized network, the central control node is able to acquire global status information, so opportunistic channel access is particularly applicable to a centralized network, and a number of results have been achieved based on the research in this field. However, due to the absence of a central control node in the distributed network, the research of opportunistic channel access under this particular network is still at a preliminary stage of development. Based on the above knowledge, this paper focuses on this orientation. The main work and contribution of this paper are as follows: 1. Distributed opportunistic channel access in DF relay network under continuous transmission rate is studied. The continuous transmission rate refers to the maximum rate that the system can provide with a channel. Under the guidance of the optimal stopping theory to maximize the average throughput rate of the system, the complete channel access strategy for obtaining the DF two-hop channel information is given. because the overall signal-to-noise ratio of the system in the DF relay network is determined by a small decision in two hops, a partial channel access strategy of decision-making only needs to be obtained by acquiring the first hop channel information. Compared with the full-channel access strategy, the strategy can save the channel detection time and improve the performance of the system. In order to sufficiently utilize the performance gain provided by the time diversity set, a relay latency strategy for transmission over a plurality of channel coherence times is also investigated. According to the characteristics of partial channel access strategy and relay waiting strategy, a hybrid double-layer channel access strategy combining the advantages is proposed. The above four strategies are pure threshold strategy which is simple and feasible in practical application, and the threshold is obtained by iterative algorithm with fast convergence and lower computational complexity. The simulation results show the performance gain between the strategies and prove the reliability of the proposed algorithm. Distributed opportunistic channel access in DF relay network at discrete transmission rate is studied in two scenarios of fixed relay and non-fixed relay. A discrete transmission rate means that the system uses elements within a particular set of discrete transmission rates for transmission. Due to the unique structure of the discrete transmission rate, the solution of the optimal access strategy and the solution of the continuous transmission rate differ greatly. In addition, the research on opportunistic channel access of non-fixed relay system at continuous transmission rate is confronted with some difficulties. Therefore, the research results of the non-fixed relay system at discrete rate are of great significance to relevant research at continuous rate. In the fixed relay DF cooperative network, the complete channel and partial channel access strategy under the discrete transmission rate are first proposed. Then, using the characteristics of the discrete transmission rate, an enhanced relay waiting strategy with significant improvement on the performance of the system is proposed. Finally, the enhanced hybrid double-layer channel access strategy combining partial channel access policy and enhanced relay waiting strategy is studied. In the non-fixed relay DF cooperative network, the complete channel access strategy, partial channel access strategy and enhanced relay waiting strategy under the discrete transmission rate are presented. All these strategies are pure threshold rules with lower computational complexity. The simulation results show the performance gain between the above strategies, and verify the reliability of the proposed algorithm. Distributed opportunistic channel access in Ad-hoc networks is constrained by queue stability after introducing queue status information. Firstly, the channel access strategy under sufficient data is given, and then the channel access strategy under actual transmission data is proposed. In order to further ensure the stability of the queue, a channel access strategy based on Lyapunov algorithm is proposed. The strategy combines channel information and channel access of queue information into a constrained optimization model, transforms it into an unconstrained optimization problem by using Lyapunov optimization theory, and solves the problem by using the optimal stopping theory. Finally, we propose a channel access strategy based on Lyapunov algorithm under actual transmission data, which introduces the actual transmission data into the target function, so that the average throughput rate and queue stability of the system are further improved. All the above strategies comply with the rules of pure threshold. The simulation result effectively verifies the reliability of the proposed strategy.
【學位授予單位】：西安電子科技大學
【學位級別】：博士
【學位授予年份】：2016
【分類號】：TN92
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