發(fā)布時間：2018-10-20 09:14

【摘要】：隨著電力線通信技術的不斷發(fā)展,電力線作為一種分布最廣的通信媒介,在家居自動化、遠程秒表、負荷控制、寬帶網(wǎng)絡的接入和音頻信號等高速數(shù)據(jù)傳輸?shù)阮I域具有得天獨厚的優(yōu)勢和不可估量的市場潛力。新一代寬帶無線接入技術OFDMA,以其傳輸速率高、資源分配靈活、能同時支持多個用戶的特點被成功的應用于電力線通信系統(tǒng)中�；�于OFDMA的資源分配算法相繼出現(xiàn),但其在電力線通信系統(tǒng)中的應用研究還處于初步階段,仍存在計算量大、不易實現(xiàn)的缺點,本文重點研究基于OFDMA技術的電力線通信系統(tǒng)資源分配問題。為提高電力線通信系統(tǒng)的資源利用率和服務質(zhì)量,本論文在研究低壓配電網(wǎng)電力線通信系統(tǒng)信道模型基礎上,結(jié)合OFDMA技術的理論知識,提出一種基于改進差分進化算法的電力線通信單層多用戶資源分配算法。該算法以速率自適應為準則,在功率譜限制條件下,根據(jù)各用戶的信道信息進行子載波的動態(tài)分配,在保證多用戶不同QoS要求的前提下最大化系統(tǒng)的吞吐量。在典型的電力線通信系統(tǒng)環(huán)境下進行了仿真實驗,實驗結(jié)果表明,與現(xiàn)有的電力線資源分配算法相比,本課題所提算法在用戶公平性和系統(tǒng)容量上都有很大改善,有效地提高了電力線通信系統(tǒng)的性能。由于資源分配在電力線通信系統(tǒng)的不同層面具有不同的約束條件和優(yōu)化目標,本論文對物理層、鏈路層、網(wǎng)絡層和應用層進行了深入的研究,提出一種混合業(yè)務下的跨層資源分配算法,即在數(shù)據(jù)鏈路控制(MAC)層基于效用函數(shù)的用戶調(diào)度算法和在物理(PHY)層基于優(yōu)先級的子載波-功率聯(lián)合分配方案,在提高系統(tǒng)利用率的同時為用戶提供不同QoS等級的傳輸服務。在數(shù)據(jù)鏈路控制層,綜合考慮信道狀態(tài)信息、業(yè)務包模型、隊列狀態(tài)信息和QoS需求,確定用戶的優(yōu)先級;在物理層,結(jié)合速率自適應和裕度自適應準則,按照用戶的優(yōu)先級為各用戶動態(tài)的分配子載波-功率資源。其思想是盡量減小因盲目分配而造成的資源浪費,以盡可能少的資源滿足所有用戶的最小速率要求,在保證用戶公平性的前提下,若剩余資源能滿足用戶的最大許可速率,則以剩余資源的最大化為優(yōu)化目標,否則,以系統(tǒng)吞吐量最大化為優(yōu)化目標。實驗結(jié)果證明,與現(xiàn)有的算法相比,本課題所提出的算法能夠滿足用用戶公平性和服務質(zhì)量,并且能夠利用更少的資源得到更大的系統(tǒng)吞吐量。
[Abstract]:With the continuous development of power line communication technology, power line as the most widely distributed communication medium, in home automation, remote stopwatch, load control, Access to broadband networks and high-speed data transmission such as audio signals have unique advantages and inestimable market potential. The new generation broadband wireless access technology (OFDMA,) has been successfully applied in power line communication system because of its high transmission rate, flexible resource allocation and the ability to support multiple users simultaneously. Resource allocation algorithms based on OFDMA appear one after another, but its application research in power line communication system is still in the initial stage, and still has the shortcomings of large computation and difficult to be realized. This paper focuses on the power line communication system resource allocation based on OFDMA technology. In order to improve the resource utilization and service quality of power line communication system, this paper studies the channel model of power line communication system in low voltage distribution network, and combines the theoretical knowledge of OFDMA technology. A single layer multiuser resource allocation algorithm for power line communication based on improved differential evolution algorithm is proposed. Based on the criterion of rate adaptation, the algorithm dynamically allocates subcarriers according to the channel information of each user under the condition of power spectrum limitation, and maximizes the throughput of the system under the premise of multi-users' different QoS requirements. In the typical power line communication system, the simulation results show that compared with the existing power line resource allocation algorithm, the proposed algorithm in this paper has a great improvement in user fairness and system capacity. The performance of power line communication system is improved effectively. Because resource allocation has different constraints and optimization objectives in different layers of power line communication system, this paper makes a deep research on physical layer, link layer, network layer and application layer. A cross-layer resource allocation algorithm based on utility function in the data link control (MAC) layer and a priority-based sub-carrier power joint allocation scheme in the physical (PHY) layer are proposed. At the same time, improve the utilization of the system and provide users with different QoS levels of transmission services. In the data link control layer, the channel state information, service packet model, queue state information and QoS requirements are considered synthetically to determine the priority of the user. Subcarrier-power resources are dynamically allocated to each user according to the priority of the user. The idea is to minimize the waste of resources caused by blind allocation, to meet the minimum rate requirements of all users with as few resources as possible, and to ensure the fairness of users, if the remaining resources can satisfy the maximum permission rate of users. The optimization goal is to maximize the remaining resources, otherwise, to maximize the throughput of the system. Experimental results show that compared with the existing algorithms, the proposed algorithm can meet the user fairness and quality of service, and can use less resources to achieve greater system throughput.
【學位授予單位】：哈爾濱工程大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TN913.6;TM73

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本文編號：2282705