计算机工程

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正交频分复用系统中的载波频偏估计方案

林 婧,叶 凡,任俊彦   

  1. (复旦大学专用集成电路与系统国家重点实验室微纳电子科技创新平台,上海201203)
  • 收稿日期:2014-05-06 出版日期:2015-04-15 发布日期:2015-04-15
  • 作者简介:林 婧(1989 - ),女,硕士研究生,主研方向:无线通信,集成电路设计;叶 凡,副教授、博士研究生;任俊彦,教授、博士生导师。
  • 基金项目:
    国家科技重大专项基金资助项目(2011ZX03004-001-02)。

Estimation Scheme of Carrier Frequency Offset in Orthogonal Frequency Division Multiplexing System

LIN Jing,YE Fan,REN Junyan   

  1. (Micro-Nano Electronics Science and Technology Innovation Platform,State Key Lab of ASIC and System,Fudan University,Shanghai 201203,China)
  • Received:2014-05-06 Online:2015-04-15 Published:2015-04-15

摘要: 针对正交频分复用(OFDM)系统中模拟前端的非理想因素(包括载波频偏和I / Q 失配等)对系统性能的 影响,提出一种在频域对非理想因素进行载波频偏估计的方案。根据ECMA-368 标准建立信号模型,在频域对3 个 连续前导符进行处理,并采用余弦函数算法与正切函数算法对载波频偏进行估计。仿真结果证明,与传统载波频偏估 计方案相比,当噪声干扰或I / Q 失配程度较大时,该方案仍具有较高的估计精度,增强了OFDM 系统的鲁棒性。

关键词: 正交频分复用, 宽带系统, 载波频偏估计, I / Q 失配, 阈值

Abstract: In order to solve the problem of non-ideal factors ( including Carrier Frequency Offset ( CFO ), I / Q imbalance,etc. ) introduced from analog front-end in bandwidth Orthogonal Frequency Division Multiplexing(OFDM) system,an effective CFO estimation scheme in frequency domain is proposed. Based on ECMA-368 standard,the signal model is built. Processing three consecutive preambles in the frequency domain,cosine function algorithm and tangent function algorithm can be adopted to estimate CFO. Simulation results verify that,compared with the traditional schemes, the proposed scheme is robust to big CFO and I / Q imbalance,thus it can provide better performance and enhance the robustness of the system.

Key words: Orthogonal Frequency Division Multiplexing ( OFDM ), bandwidth system, Carrier Frequency Offset (CFO) estimation, I / Q imbalance, threshold

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