正交频分复用系统中的载波频偏估计方案  

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

作　　者：林婧[1] 叶凡[1] 任俊彦[1] 

机构地区：[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

出　　处：《计算机工程》2015年第4期102-106,111,共6页Computer Engineering

基　　金：国家科技重大专项基金资助项目(2011ZX03004-001-02)

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。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 bandw idth Orthogonal Frequency Division M ultiplexing（ OFDM）system,an effective CFO estimation scheme in frequency domain is proposed. Based on ECM A-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 w ith 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.

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 

分 类 号：TN925[电子电信—通信与信息系统]