基于OFDMA接入技术在车联网中的应用研究

发布时间：2018-03-18 03:05

  本文选题：车联网　切入点：OFDMA　出处：《电子科技大学》2014年硕士论文　论文类型：学位论文

【摘要】：随着我国民用汽车数量的不断增加,我们的交通系统正承受着越来越大的压力,行车难、停车难、行车安全问题正不断的困扰着我们的城市和生活在城市中的出行者。另一方面无线通信技术的飞速发展,传感器技术的不断进步也为生活在这个科学技术快速发展时代里的我们提供了可以用于解决交通拥堵等问题的方法。融入了当代多种高科技技术的新一代智能交通系统车联网被人们所提出来用以解决现在的交通问题。本文将正交频分多址复用(OFDMA)接入技术引入到车联网所使用的IEEE802.11p标准中,将车联网通信中原有的一个信道划分成供多个车上单元同时接入的子信道,并针对这种构架设计了一种可以使多址接入信号实现上行同步的接收机结构,在设计中根据实际运用中设备需求量大,成本要求低的特点,对结构进行资源节省的设计方案。主要的工作内容如下:1)首先为OFDMA接入技术能够在IEEE802.11p标准中具有良好的兼容性设计了OFMDA/CSMA混合MAC层协议,并对不同情况下使用OFDM模式和OFDMA模式通信进行了合理的安排使系统不仅结构简单,而且最大程度的提高系统的吞吐率,将系统性能大大的提高。2)在OFMDA/CSMA混合MAC层协议的设计框架下我们设计了路上单元(RSU)的上行同步接收机结构,并将这种结构结合到传统的IEEE802.11p标准的接收发射机系统中,使原系统在尽量少的改变的前提下实现OFDMA接入技术的引入。我们首先给出了这套系统各个模块的设计方案和算法,并将各个模块组成的系统进行仿真即算法级的设计和验证,证明了系统设计的正确性和有效性,仿真结果显示满足原有标准的各个参数和性能要求。3)介绍了所设计模块在FPGA上的设计方案,给出了各个设计模块的实现方案和模块中复杂算法的FPGA实现算法,对所设计的模块在QuartusⅡ11.1进行了编译并在Modelsim下进行了功能仿真验证其逻辑功能的正确性。最后在QuartusⅡ11.1下搭建接收机系统然后将整个系统在Modelsim下做了系统仿真,并将仿真数据导出到MATLAB中进行分析验证。系统分析显示我们的设计消耗资源少,系统设计有效,性能满足条件。
[Abstract]:With the increasing number of civilian vehicles in our country, our transportation system is under increasing pressure. It is difficult to drive and stop. The problem of traffic safety is constantly perplexing our city and the travelers living in the city. On the other hand, with the rapid development of wireless communication technology, The continuous progress of sensor technology also provides us with a way to solve the problem of traffic jam and so on for us to live in this era of rapid development of science and technology. In this paper, orthogonal Frequency Division Multiplexing (OFDMA) access technology is introduced to the IEEE802.11p standard used in vehicle networking. The original channel in the vehicle network communication is divided into sub-channels for multiple on-board units to access at the same time, and a receiver structure is designed to synchronize the uplink of the multiple access signals. In the design, according to the characteristics of large demand for equipment and low cost in practical application, The main work is as follows: 1) first of all, we design the OFMDA/CSMA hybrid MAC layer protocol for the good compatibility of the OFDMA access technology in the IEEE802.11p standard. The reasonable arrangement of the communication between OFDM mode and OFDMA mode under different conditions makes the system not only simple in structure, but also improve the throughput of the system to the greatest extent. The system performance is greatly improved. 2) under the design frame of OFMDA/CSMA hybrid MAC protocol, we design the uplink synchronous receiver structure of the road unit RSUS, and combine this structure into the traditional IEEE802.11p standard receiver system. So that the original system with as few changes as possible under the premise of the introduction of OFDMA access technology. First, we give the design of each module of the system and algorithms, and each module of the system simulation, that is, algorithm level design and verification, The correctness and validity of the system design are proved. The simulation results show that the parameters and performance requirements of the original standard are met. 3) the design scheme of the designed module on FPGA is introduced. The implementation scheme of each design module and the FPGA implementation algorithm of the complex algorithm in the module are given. The designed module is compiled in Quartus 鈪，

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