CAJ | 학술논문

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。
침대정교빈분복용( OFDM)계통중모의전단적비이상인소(포괄재파빈편화I/Q실배등)대계통성능적영향，제출일충재빈역대비이상인소진행재파빈편고계적방안。근거ECMA-368표준건립신호모형，재빈역대3개련속전도부진행처리，병채용여현함수산법여정절함수산법대재파빈편진행고계。방진결과증명，여전통재파빈편고계방안상비，당조성간우혹I/Q실배정도교대시，해방안잉구유교고적고계정도，증강료OFDM계통적로봉성。
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.