【作者】 白亚妮；

【导师】 赵国庆；

【作者基本信息】 西安电子科技大学 ， 电路与系统， 2010， 硕士

【摘要】 随着信息产业的飞速发展,全球通信产业呈现移动化、宽带化、IP化的趋势,IEEE802.16e迎合了这样的发展趋势,是一种很有发展潜力的宽带无线接入技术。本文研究了基于IEEE802.16e标准的OFDMA系统的物理层技术,上行测距技术和信道估计技术是物理层中的关键技术,作为本文的重点研究对象。首先介绍了测距的类型及流程,研究了两种测距算法:时域检测和时频检测算法,针对802.16e上行帧结构,给出了有效的时频检测算法,通过仿真可以看出检测性能较优。考虑到实际系统中的多用户碰撞现象的存在,研究了基于干扰消除的多用户检测算法并给出了仿真结果。研究了基于导频的LS、LMMSE和基于奇异值分解的信道估计算法,为了获得整个信道的响应,对多种插值算法进行了研究,通过仿真进行了性能验证。采用Altera的FPGA芯片,完成了上行测距和信道估计的功能。更多还原

【Abstract】 With the fast development of Information Industry, the global communication industry displays the traits of Mobility, Broadband and IP-based architecture, the appearance of IEEE802.16e meets the trend of development, and IEEE802.16e is a potential Broadband Wireless Access technology. This article researches the physical level technology of OFDMA system based on IEEE802.16e standard, the uplink ranging and channel estimation are key technologies in the physical level, focus on these two technologies. Firstly, a brief introduction of the ranging types and process, the time domain detection and the time-frequency detection algorithm are researched, in view of the uplink frame structure based on IEEE802.16e, the effective time-frequency detection algorithm is presented, and the performance of time-frequency detection algorithm is superior. Secondly, in view of multi-user collision phenomenon in the actual system, researches the multi-user detection algorithm based on interference clearance and gives simulation results. Least square, linear minimum mean-squared error and decomposition based on the singular value are researched, to obtain the entire channel’s response, several interpolation algorithms are researched and simulated .Uses the Altera FPGA chip, completes the uplink ranging and channel estimation.更多还原