A Joint Algorithm of Carrier and Sampling Frequency Offset Correction for High Order QAM Modulated OFDM Signals

LIU Tian; YANG Lin; DENG Kai; TANG You-xi; ZHUANG Jia-min

doi:10.3969/j.issn.0372-2112.2013.03.011

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A Joint Algorithm of Carrier and Sampling Frequency Offset Correction for High Order QAM Modulated OFDM Signals

更新时间：2025-07-16

- A Joint Algorithm of Carrier and Sampling Frequency Offset Correction for High Order QAM Modulated OFDM Signals
- Acta Electronica Sinica Vol. 41, Issue 3, Pages: 481-487(2013)
- 作者机构：
  
  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
  5. 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
  6. 上海卫星工程研究所,上海,200240
  7. 宜宾学院物理与电子工程系,四川,宜宾,644000
  8. 四川省电力公司,四川,成都,610023
- 作者简介：
- 基金信息：
  
  National Natural Science Foundation of China (No.60832007, No.60902027, No.60901018, No.61001087, No.61271164);Fundamental Research Funds for the Central Universities (No.ZYGX2010J012, No.ZYGX2009J010);National Science and Technology Major Project of the Ministry of Science and Technology (No.2010ZX03003-002-01, No.2011ZX03001-006-01);Project of Science and Technology Project of Sichuan Electric Power Company
- DOI：10.3969/j.issn.0372-2112.2013.03.011
  CLC： TN92
- Published：2013
- 稿件说明：
移动端阅览
LIU Tian, YANG Lin, DENG Kai, et al. 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.
DOI：

LIU Tian, YANG Lin, DENG Kai, et al. 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. DOI： 10.3969/j.issn.0372-2112.2013.03.011.

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.

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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