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IEEE802.16-OFDM分组检测和符号同步算法

An Algorithm of Package Detection and Symbol Synchronization for IEEE802.16-OFDM
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摘要 在OFDM(正交频分复用)系统中,收发双方的分组检测和符号同步是决定系统性能好坏的重要因素之一。本文阐述了IEEE802.16-OFDM帧结构,分析了符号同步对系统性能的影响,对基于ML(最大似然)的同步算法进行了研究。由于经过衰落信道传输后,数据之间的相关性遭到破坏,从而影响ML性能,因此本文根据IEEE802.16的帧结构,提出了一种基于能量代价函数的符号同步算法,在符号同步与非同步时代价函数的值不同,且在符号同步时代价函数取得最小值,所以代价函数J可以用来进行符号同步。理论推导和仿真结果表明,该算法克服了ML算法在衰落信道下性能下降的局限性。 The package detection and symbol synchronization are major factors in OFDM performance. In this paper, we present the frame structure of IEEE802. 16-OFDM, analyze the effect of symbol synchronization,study the synchronization algorithms based on ML. The relation of data is contaminated in the fading channel,so the performance of ML is affected. A new algorithm derived from the energy cost function is based on the character of the IEEE802.16 OFDM signal frame structure. The cost function J is different in different symbol synchronization states; if symbol synchronization is derived, J will be the minimum. Theoretical analysis and simulation results indicate that the proposed algorithm can overcome the drawbacks of ML and get better performance.
作者 罗丽云 刘虎 张树京
机构地区 同济大学交通运输学院 上海交通大学电子信息学院
出处 《铁道学报》 EI CAS CSCD 北大核心 2005年第4期60-65,共6页 Journal of the China Railway Society
基金 国家863计划项目(2004AA505560)
关键词 IEEE802.16-OFDM 分组检测 符号同步 能量代价函数 IEEE802.16-OFDM package detection symbol synchronization energy cost function
分类号 TP393.17 [自动化与计算机技术—计算机应用技术]
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参考文献12

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铁道学报
2005年 第4期

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