本文選題：車聯(lián)網(wǎng)　切入點(diǎn)：OFDMA　出處：《電子科技大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著我國(guó)民用汽車數(shù)量的不斷增加,我們的交通系統(tǒng)正承受著越來越大的壓力,行車難、停車難、行車安全問題正不斷的困擾著我們的城市和生活在城市中的出行者。另一方面無線通信技術(shù)的飛速發(fā)展,傳感器技術(shù)的不斷進(jìn)步也為生活在這個(gè)科學(xué)技術(shù)快速發(fā)展時(shí)代里的我們提供了可以用于解決交通擁堵等問題的方法。融入了當(dāng)代多種高科技技術(shù)的新一代智能交通系統(tǒng)車聯(lián)網(wǎng)被人們所提出來用以解決現(xiàn)在的交通問題。本文將正交頻分多址復(fù)用(OFDMA)接入技術(shù)引入到車聯(lián)網(wǎng)所使用的IEEE802.11p標(biāo)準(zhǔn)中,將車聯(lián)網(wǎng)通信中原有的一個(gè)信道劃分成供多個(gè)車上單元同時(shí)接入的子信道,并針對(duì)這種構(gòu)架設(shè)計(jì)了一種可以使多址接入信號(hào)實(shí)現(xiàn)上行同步的接收機(jī)結(jié)構(gòu),在設(shè)計(jì)中根據(jù)實(shí)際運(yùn)用中設(shè)備需求量大,成本要求低的特點(diǎn),對(duì)結(jié)構(gòu)進(jìn)行資源節(jié)省的設(shè)計(jì)方案。主要的工作內(nèi)容如下:1)首先為OFDMA接入技術(shù)能夠在IEEE802.11p標(biāo)準(zhǔn)中具有良好的兼容性設(shè)計(jì)了OFMDA/CSMA混合MAC層協(xié)議,并對(duì)不同情況下使用OFDM模式和OFDMA模式通信進(jìn)行了合理的安排使系統(tǒng)不僅結(jié)構(gòu)簡(jiǎn)單,而且最大程度的提高系統(tǒng)的吞吐率,將系統(tǒng)性能大大的提高。2)在OFMDA/CSMA混合MAC層協(xié)議的設(shè)計(jì)框架下我們?cè)O(shè)計(jì)了路上單元(RSU)的上行同步接收機(jī)結(jié)構(gòu),并將這種結(jié)構(gòu)結(jié)合到傳統(tǒng)的IEEE802.11p標(biāo)準(zhǔn)的接收發(fā)射機(jī)系統(tǒng)中,使原系統(tǒng)在盡量少的改變的前提下實(shí)現(xiàn)OFDMA接入技術(shù)的引入。我們首先給出了這套系統(tǒng)各個(gè)模塊的設(shè)計(jì)方案和算法,并將各個(gè)模塊組成的系統(tǒng)進(jìn)行仿真即算法級(jí)的設(shè)計(jì)和驗(yàn)證,證明了系統(tǒng)設(shè)計(jì)的正確性和有效性,仿真結(jié)果顯示滿足原有標(biāo)準(zhǔn)的各個(gè)參數(shù)和性能要求。3)介紹了所設(shè)計(jì)模塊在FPGA上的設(shè)計(jì)方案,給出了各個(gè)設(shè)計(jì)模塊的實(shí)現(xiàn)方案和模塊中復(fù)雜算法的FPGA實(shí)現(xiàn)算法,對(duì)所設(shè)計(jì)的模塊在QuartusⅡ11.1進(jìn)行了編譯并在Modelsim下進(jìn)行了功能仿真驗(yàn)證其邏輯功能的正確性。最后在QuartusⅡ11.1下搭建接收機(jī)系統(tǒng)然后將整個(gè)系統(tǒng)在Modelsim下做了系統(tǒng)仿真,并將仿真數(shù)據(jù)導(dǎo)出到MATLAB中進(jìn)行分析驗(yàn)證。系統(tǒng)分析顯示我們的設(shè)計(jì)消耗資源少,系統(tǒng)設(shè)計(jì)有效,性能滿足條件。
[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，

本文編號(hào)：1627696