使用空载波的OFDM频率同步方法分析与改进
Frequency Synchronization in OFDM Systems Using Null Subcarriers: Analysis and Improvement
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摘要: 该文分析了利用空载波进行频率偏移估计的一般方法，着重分析了在任意空载波分布下，包含有信道零点的频率同步算法。文章指出了空载波分布与信道零点分布对载波同步算法的影响，并提出了自适应的分布空载波以消除频率估计误差的方法，该方法在任意子载波分布时比常规方法性能有明显提高。
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关键词:
- OFDM; 频率估计; 同步
Abstract: A novel frequency offset estimation algorithm for Orthogonal Frequency Division Multiplexing(OFDM) signals transmitted over frequency-selective channels is analyzed. The algorithm is discussed with channel zeros and arbitrarily assignment of null-subcarriers. The effect of distribution of null subcarriers and channel zeros is discussed. An adaptive assignment of null-subcarriers scheme is proposed. The proposed algorithm performs significantly better than the already existing methods. -
Santella Giovanni. A frequency and symbol Ssynchronization system for OFDM signals: Architecture and simulation results[J].IEEE Trans. on Vehicular Tech.2000, 49(1):254-[2]Liu Hui, Ufuk Tureli. A high efficiency carrier estimation for OFDM communications [J]. IEEE Comm. Letters 1998, 2(4):104106. .[3]Ma Xiaoli, Giannakis B. Georgios, Barbarossa SergioNon-data-aided carrier offset estimators for OFDM with nullsubcarriers: Identifiability, algorithms, and performance [J].. IEEE Journal on Selected Areas in Comm.2001, 19(12):2504- -
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