Computer Engineering and Applications ›› 2017, Vol. 53 ›› Issue (4): 118-122.DOI: 10.3778/j.issn.1002-8331.1505-0226

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Estimation for carrier frequency offset in OFDM system

ZHOU Xuerong1, XUE Xiangyan1, YE Fan1, REN Junyan1,2   

  1. 1.State-Key Lab of ASIC & System, Fudan University, Shanghai 201203, China
    2.Micro-/Nano-Electronics Innovation Platform, Fudan University, Shanghai 201203, China
  • Online:2017-02-15 Published:2017-05-11

正交频分复用系统中载波频偏的估计

周雪荣1,薛香艳1,叶  凡1,任俊彦1,2   

  1. 1.复旦大学 专用集成电路国家重点实验室,上海 201203
    2.复旦大学 微纳电子创新平台,上海 201203

Abstract: According to the situation that non-ideal factors of analog front-end in wideband Orthogonal Frequency Division Multiplexing(OFDM) system exit at the same time, this paper presents an estimation algorithm of Carrier Frequency Offset(CFO) with presence of I/Q mismatch(I/Q-M). The scheme utilizes 3 consecutive preambles and processes them at frequency domain to acquire 2 different estimation algorithms and the carrier frequency offset is divided into two scopes using different algorithms respectively on the basis of I/Q mismatch degree and noise. Simulation results show that the proposed scheme is able to estimate the offset accurately to both Frequency Independent(F-I) and Frequency Dependent(F-D) I/Q mismatch.

Key words: Orthogonal Frequency Division Multiplexing(OFDM), wideband system, Carrier Frequency Offset(CFO), I/Q mismatch

摘要: 针对正交频分复用系统中非理想前端因素同时存在的情况,提出一种在I/Q失配存在的条件下载波频偏的估计算法。该算法利用三个连续的前导符在频域推导出两种不同估计算法,根据噪声及I/Q失配程度将载波频偏划分为两区间分别选用不同算法进行估计。仿真结果表明,该算法在频率相关和频率无关I/Q失配条件下均能有效地准确估计载波频偏。

关键词: 正交频分复用, 宽带系统, 载波频偏估计, I/Q失配