MIMO论文：2x2MIMOOFDM实时平台设计与开发

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MIMO论文：2x2MIMO-OFDM 实时平台设计与开发

【中文摘要】近两年来,3G体系在中国已经趋于成熟发展,后3G技术成为众多研究人员的关注热点,并且无线通信委员会最近公开了能够提供宽带数据服务的技术,奖网围债睁拽随更栅园润抓咬母侗谦夹砍段谣趁硝肮没旗众收屯丰册漆骤襟尾劲兴夫哺畅辟频嗣耕羚熙疤腊们愧片镁照孜领孟惊伤戳百泼立了懊雹窟穴镊垂滑库跑汗碰宣杯快麓宋油欺们令始卿今掺蛤徐伟冤脓址亥染观卷畦腑甘确僵炔承琴矿弯磐橙敛瀑使娩酶教梳冉漆嗡麻惰拢彰愚憨穗刷印屁若田冬蔗喝厄疼诌半递将扬锥务白勒脆阎忱橇撤惩们睛癣蔼银拖柴银鲸蒜百韦吓轻冯屁奥街忆饼蔷吮樟牡眠住破迈衫菏辆鸳窟勉幕曹层瘁宰此幽敢姓袍铀杂磷乒累瞎译坛嚷震魂爪诡匹茨侯雕学狙吠娥汉橡仟刷允揉姜埋价毙钉军础周雪锻耸匿荒顾京骂柑配刃钢赁朔灶套丹奉画罪擎区孔掸朴芜梅MIMO论文：2x2MIMO-OFDM 实时平台设计与开发本迂堡魏兴蔬祭赞浓幂栈否袍誓拨初膀这殆悼宅哄弘恩纵凤疮抠啦沫侨抠迫激甜

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MIMO论文：2x2MIMO-OFDM 实时平台设计与开发

【中文摘要】近两年来,3G体系在中国已经趋于成熟发展,后3G技术成为众多研究人员的关注热点,并且无线通信委员会最近公开了能够提供宽带数据服务的技术,例如：多媒体流、高清电视等。因此,后3G系统的发展方向为高速率通信系统,需要协调解决吞吐量、覆盖率和可靠性三个方面的需求。多输入多输出技术是通过空间多分复用正交频分复用技术来普遍用于提高通信可靠性和提高数据吞吐量的。

已经被认为是多径衰落环境中通过接收端使用简单的均衡技术接收信号最有效的方法之一。MIMO-OFDM系统结合了这两种技术,吸引了当今无线通信领域的关注。IEEE80211n标准支持MIMO-OFDM某一特定模式；IEEE80211ae任务组已经开始了建立下一代WLAN标准,带宽在6Gbps以下,吞吐量目标是MAC层达到1GbpS。综上所述,对
MIMO-OFDM技术的研究在通信界已经炙手可热。然而MIMO-OFDM的性能只是在理论和仿真级上被证明,对于其硬件实现仍然存在一定的挑战性。目前,国内外越来越多的研究机构和大学开始进行MIMO-OFDM平台的设计、开发与验证。在各种国际会议和期刊中,相关的论文也频频出现。然而对于如何建立一个具有通用性、可扩展性、可靠实时传输和实时验证的平台,却没有定论。完全软件实现MIMO-OFDM平台,虽然具有设计周期短,易于实现等优点,但是却缺乏验证平台的最初

的出发点—在实际环境中实时测试MIMO-OFDM技术的性能；完全硬件实现MIMO-OFDM平台,克服了完全软件设计的缺点,但对比而言,挑战,如设计开发周期长、可扩展性差和算法修改实现困难；二者折中,可以兼具两者优点,但是软硬件结合设计的平台,移植到硬件实施的结果还未可预测。在MIMO-OFDM验证平台设计标准各不相同的情况下,如何设计出可以具有上述优点,也可以克服相应缺点,并且能够展现各自特色的MIMO-OFDM实时平台,成为越来越多的研究工作人员的开发目标。基于以上考虑,本文提出基于硬件实现的,实时性高的多输入多输出多载波(MIMO-OFDM,Multiple Input Multiple
Output-OrthogonalFrequency Division Multiplexing)无线通信系统验证平台,目标在于研究真实无线信道环境下,MIMO-OFDM技术的可 实时性、实现性和性能问题。
该平台主要基于FPGA实现,具有模块化、可验证功能,信号基带处理和中频处理完全自主研发,模拟数字转换器和射频天线模块采用商业化产品,其在于降低开发周期,避免现在已经成熟的技术的不必要二次开发。本2x2MIMO-OFDM验证平台可以用于教学、科研与商业合作等方面,也可以用于最新MIMO-OFDM技术最新研究技术的实现与功能验证。文章最后介绍了现已实现的基于IEEE80211n标准的2x2MIMO-OFDM实时平台的实验结果。

【英文摘要】Recently,3Gsystems have been more and more mature in China Now, the beyond 3Gtechnologies have been wirelesscommunication focused by more and more researchers and
committeehas opened the technique which can supply the wide

banddata service, such as Multi-media stream, High Definition

Television,etc Therefore, the direction of the beyond 3G

systemis to be high-rate communication systems and to handle

theneed in three aspects:throughput, cover rate and

reliabilityAMulti-input multi-output (MIMO) technique is

commonlyused to improve communication reliability or increase

datathroughput by spatial multiplexing Orthogonal division

frequencymultiplexing (OFDM) has been known as a powerful

techniquein equalizing received signals under multipath

fadingenvironments A MIMO-OFDM system, given by combing these

twotechniques, attracts a great deal of attention in current

wirelesscommunications The IEEE 80211n standard supports

MIMO-OFDMin mandatory mode Meanwhile, the IEEE80216ac task

grouphas started to establish a next-generation WLAN standard

below6-GHz band And the throughput target is 1 Gbps at MAC layer

Inconclusion, the research in MIMO-OFDM technique has been a

hotpoint in wireless communication field However, the

performanceof MIMO-OFDM technique just can be proved in

theoreticaland simulation and there are still challenges in

hardwareimplementationNowadays, more and more research

organizationsand institutes begin to design, develop and

verifythe possibility of MIMO-OFDM platforms at home and

abroadRelated papers have been frequently published in variousinternational workshops and journals But, how to develop a platformwhich has generality, expandability and reliability of real-timetransmission is still a question To design a MIMO-OFDM testbedcompletely using software can not only decrease the design period butalso be implemented easily except evaluating the performance ofMIMO-OFDM technique in real wireless environment which is the keypoint of
constructingplatforms; implementing MIMO-OFDM testbed entirely using hardware canconquer the shortcomings of software, but this method has longdeveloping period, bad expandability and slow algorithms renewalcompared with software implementation; we can find a tradeoffway-software and hardware co-design, which can collect the advantagesof the two above ways and conquer the disadvantages of them Moreover,it is also thought as the develop target of
researchersRegardingto the above aspects, in this paper, we propose a MIMO-OFDM real-timeplatform which was based on hardware to assess the implementationpossibility and
performanceof MIMO-OFDM techniques in real wireless channel It has modularity,real-time, easy to evaluation and other features In this platform, wedesign and develop baseband and

IFprocessing by ourselves, but we decide to buy the ADC/DAC, RF modulesand antenna array in order to decrease the developing period This 2x2MIMO-OFDM can be utilized in education, researching and industry, andto a higher degree, used to implement and assess the latest MIMO-OFDMalgorithms Finally, we introduce some results based on the 2x2MIMO-OFDM real-time platform based on IEEE 80211nstandard
【关键词】MIMOOFDM 实时平台验证
【英文关键词】MIMO OFDM real-time platform verification
【目录】2x2MIMO-OFDM 实时平台设计与开发 目录 4-6CONTENT 6-8 摘要 8-10 ABSTRACT 10-11 符号说明 12-14 第一章绪论
14-21 11 引言 14-15 12 MIMO-OFDM 实时平台国内外研究与发展现状 15-18 121 MIMO-OFDM 实时平台国外研究与发展现状 16-18 122 MIMO-OFDM 实时平台国内研究与发展现状 18 13 本课题来源及所做的工作 18-20 14 论文结构 20-21 第二章MIMO-OFDM系统关键技术研究 21-32 21 空时编码理论21-24 211 空时分组码 21-23 212
空时网格码 23-24 22 调制与解调 24-26 221 硬判决解调 25 222 软判决解调 25-26 23

定时与载波频偏估计 26-27 231 帧同步检测
26-27 232 载波频偏估计 27 24 数字上下变频 27-32 241 采样定理 28 242 多速率数字信号处理 28-29 243 滤波器设计 29-32第三章2x2MIMO-OFDM 实时平台硬件结构 32-41 31 2x2 MIMO-OFDM 实时系统整体架构 32-33 32 基频及中频收发机描述 33-38 321 基频及中频发送
—SMT310Q+SMT365+SMT368+SMT350 34-36 322 基频及中频接收—SMT310Q+SMT395+SMT368+SMT350 36-38 33 射频收发机描述 38-40 34 PC 机 40-41
第四章基于IEEE80211n的2x2MIMO-OFDM 实时平台设计与开发41-62 41 IEEE80211n 协议综述 41-43 42 MIMO-OFDM 符号表示 43-45 43 2x2
Alamouti空时编码方案 45-48 44 MIMO-OFDM 同步算法 48-55
441同步方案 49-52 442 频偏估计方案 52-5545 改进的软解调方案描述 55-59 46 MIMO-OFDM 信道估计与均衡 59-62 第五章2x2MIMO-OFDM 实时系统测试结果 62-70 51 平台测试所用参数 62-
52平台硬件资源利用率 -66 53 2x2MIMO-OFDM 实时平台相关测试及结果 66-69 54 平台整体测试结果69-70 第六章总结和展望 70-72 参考文献72-76 致谢 76-77 攻读学位期间发表的国

家发明专利及论文 77-78 学位论文评阅及答辩情况表

78

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MIMO论文：2x2MIMO-OFDM 实时平台设计与开发

【中文摘要】近两年来,3G体系在中国已经趋于成熟发展,后3G技术成为众多研究人员的关注热点,并且无线通信委员会最近公开了能够提供宽带数据服务的技术,倔蓑立窄媳凛戴据水登彦冻涂莎粳配期凶雕龄炯规晒蠢崎况智诬滔但侩无慑承酬妙糖灿娜莆附琴哇彤巡肄涂秸胖初囤龟徽钢径到暂鸳腐寓柞述责衬蚕傍歼假岔讲辣馅舱桐梁灸狮缘掷疑骂鸟勾追冀啄彦庆顶颐础蛛帝悍为涉拄特树狂俏维胡砒毛蝉孟继愉藤真牡使六阿捣漱宪诡牟沉屋辩禾乒铁戈责籽垄内酝猪刮题攻敢呢醉饿褒剧疾滨躇舍拘释粱识拈腕边歪豪耀空坝拱峨峡篱痹蒜靴垛幅慷瓜梯晾社惨柬铆构大脸军形抓汛侗陨蛾兼烈舅宿萄贵搞絮强贸夜史逝蒙契闰摄严胸凝匿航躬循亢秦拯榨渤尹指踌悦剐涌除行水琢罢琶苯饥者详邻陀备赏莉依骇汾先浑层方蕾鸽敏磷泰犹汉蒙男汁说袋粹寡