使用空載波的OFDM頻率同步方法分析與改進(jìn)
Frequency Synchronization in OFDM Systems Using Null Subcarriers: Analysis and Improvement
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摘要: 該文分析了利用空載波進(jìn)行頻率偏移估計(jì)的一般方法，著重分析了在任意空載波分布下，包含有信道零點(diǎn)的頻率同步算法。文章指出了空載波分布與信道零點(diǎn)分布對載波同步算法的影響，并提出了自適應(yīng)的分布空載波以消除頻率估計(jì)誤差的方法，該方法在任意子載波分布時(shí)比常規(guī)方法性能有明顯提高。
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關(guān)鍵詞:
- OFDM; 頻率估計(jì); 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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