本科毕业设计论文题目协作通信系统中的AF中继协议研究专业名称通信工程学生姓名XXX指导教师李冬毕业时间2012.6目录摘要...............................................................IABSTRACT........................................................II第一章引言........................................................11.1研究背景......................................................11.2研究意义......................................................21.3论文结构......................................................3第二章无线信道及分集技术...........................................52.1无线通信的概念和发展史........................................52.2无线信道......................................................62.2.1无线信道的定义..........................................62.2.2影响无线信道的因素......................................62.2.3无线信道的分集..........................................72.3空间分集技术的产生及研究......................................82.4MIMO系统....................................................112.4.1MIMO技术的概念及原理.................................112.4.2MIMO的优势...........................................122.5MIMO技术及其分类............................................142.6MIMO的研究状况及应用.......................................152.6.1MIMO的研究状况.......................................152.6.2MIMO的应用...........................................172.7协作分集.....................................................192.7.1协作分集的定义和产生..................................192.7.2协作分集的原理.........................................192.7.3协作分集的优点及问题...................................20第三章协作通信及其协议............................................233.1协作通信.....................................................233.2.1固定协作策略................................................253.2.2自适应协作策略.........................................26第四章AF中继协议研究.............................................284.1固定放大转发协议.............................................284.2单中继协作通信................................................304.2.1系统模型...............................................314.2.2AF协议的SER分析......................................324.2.3调和平均值的简单MGF表达..............................344.2.4渐进紧的近似解.........................................374.2.5最优功率分配...........................................394.3AF与DF协作增益的比较........................................40第五章总结与展望..................................................455.1全文总结.....................................................455.2展望下一步...................................................45致谢..............................................................47参考文献...........................................................48毕业设计小结.......................................................49摘要近年来,随着无线通信技术的高速发展,MIMO技术被认为是对通信技术有着巨大推动作用的。然而MIMO系统对天线间距离的苛刻要求使得其无法在移动终端使用,但由无线信道的广播特性使得节点间可以互相帮助进行分布式通信,并且可以获得和固定MIMO系统相同的性能增益,所以出现了协作通信的思想。协作通信是一种新的通信方式,它把MIMO通信技术推广到更多的应用场景,在这种新的通信方式中,分散在无线网络中的终端可以看做分布式天线。通过节点的协作,增加了系统的分集增益从而获...