| 高阶QAM调制下OFDM的载波与采样频偏联合纠正 |
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| 引用本文： | 刘田,杨琳,邓凯,唐友喜,张嘉岷.高阶QAM调制下OFDM的载波与采样频偏联合纠正[J].电子学报,2013,41(3):481-487. |
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| 作者姓名： | 刘田 杨琳 邓凯 唐友喜 张嘉岷 |
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| 作者单位： | 1. 电子科技大学通信抗干扰技术国家级重点实验室, 四川成都 611731;2. 上海卫星工程研究所, 上海 200240;3. 宜宾学院物理与电子工程系, 四川宜宾 644000;4. 四川省电力公司, 四川成都 610023 |
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| 基金项目： | 国家自然科学基金，中央高校基本科研业务费专项资金资助项目，国家科技重大专项，四川省电力公司科技项目 |
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| 摘 要： | 采用高阶QAM (Quadrature Amplitude Modulation)调制的正交频分复用(OFDM,Orthogonal Frequency-Division Multiplexing)系统,相对于低阶调制来说,密集的星座点分布更容易受到载波频偏与采样频偏的影响.本文分析了高阶QAM OFDM系统对频率同步精度的要求,提出了一种载波与采样频偏联合纠正的方法,并分别针对时不变多径信道和块衰落多径Rician信道给出了频偏估计的均方误差解析表达式.均方误差的理论分析与计算机仿真结果吻合;误比特率性能仿真表明,频偏纠正后的误比特率性能与无频偏情况比较,差异小于1dB.
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| 关 键 词： | 高阶调制 正交频分复用 采样频偏 载波频偏 正交幅度调制 |
| 收稿时间： | 2012-04-27 |
A Joint Algorithm of Carrier and Sampling Frequency Offset Correction for High Order QAM Modulated OFDM Signals |
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| LIU Tian
,
YANG Lin
,
DENG Kai
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TANG You-xi
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ZHUANG Jia-min.A Joint Algorithm of Carrier and Sampling Frequency Offset Correction for High Order QAM Modulated OFDM Signals[J].Acta Electronica Sinica,2013,41(3):481-487. |
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| Authors: | LIU Tian YANG Lin DENG Kai TANG You-xi ZHUANG Jia-min |
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| Affiliation: | 1. National Key Lab of Science and Technology on Communications, University of Electronic Science and Technology of China, Chengdu, Sichuan 611731, China;2. Shanghai Institute of Satellite Engineering, Shanghai 200240, China;3. School of Physics and Electronic Engineering, Yibin University, Yibin, Sichuan 644000, China;4. Sichuan Electric Power Corporation, Chengdu, Sichuan 610023, China |
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| Abstract: | In higher order quadrature amplitude modulation (QAM) orthogonal frequency-division multiplexing (OFDM) system,the distribution of high-density constellation becomes more sensitive to carrier frequency offset (CFO) and sampling frequency offset (SFO).In this paper,the impact of frequency synchronization errors on high order QAM modulated OFDM signal is analyzed under both time-invariant multipath channel and multipath Rician fading channel,and an algorithm to jointly correct both CFO and SFO is proposed.A closed-form formula for the mean square error (MSE) of the estimation is given by the theoretical analysis and its reasonability is verified by simulation results. |
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| Keywords: | high order OFDM SFO CFO QAM |
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