| 适用于多速率高阶QAM的定时同步改进算法 |
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| 引用本文： | 张莉莉,贺知明.适用于多速率高阶QAM的定时同步改进算法[J].电讯技术,2012,52(4):508-513. |
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| 作者姓名： | 张莉莉 贺知明 |
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| 作者单位： | 电子科技大学电子工程学院,成都,611731 |
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| 基金项目： | 国家自然科学基金委员会-中国工程物理研究院联合基金资助项
目(10876006) |
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| 摘 要： | 针对速率可变的高阶正交幅度调制(QAM)信号定时同步问题,提出了一种基于Gardner理论的定时同步改进算法.新算法改原有滤波器结构为两级插值级联优化结构来实现多速率信号的定时同步,可独立于载波同步单独使用,比传统结构具有更强的普遍适用性.仿真结果表明,该算法可以准确地对速率可变的128QAM信号进行同步.
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| 关 键 词： | 软件无线电 数字接收机 定时同步 正交幅度调制 Gardner算法 可变速率 |
A modified method of timing synchronization for multi-rate high-order QAM |
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| ZHANG Li-li and HE Zhi-ming.A modified method of timing synchronization for multi-rate high-order QAM[J].Telecommunication Engineering,2012,52(4):508-513. |
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| Authors: | ZHANG Li-li and HE Zhi-ming |
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| Affiliation: | (School of Electronic Engineering,University of Electronic Science and Technology of China,Chengdu 611731,China) |
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| Abstract: | On the basis of Gardner interpolation theory about timing synchronizat
ion, a modified timing recovery method is proposed to adapt multi-rate high-orde
r QAM demodulation. The algorithm replaces the traditional filter with two-stage
cascade filters to realize the carrier synchronization, which is more
suitable for multi-rate timing synchronization. The simulation results show
that the algorithm can be used in timing synchronization for 128 QAM signal prec
isely. |
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| Keywords: | software defined radio digital receiver timing synchronization quadrature ampli
tude modulation(QAM) gardner algorithm multi-rate |
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