基于失配序列的OFDM同步算法

OFDM Synchronization Algorithm Based on Mismatched Sequence

提出了一种利用失配序列来完成OFDM符号同步的新方法。在发端直接加入失配序列作为OFDM符号的训练序列,在收端将OFDM符号序列与失配滤波器系数做相关运算,利用失配序列的优良自相关特性和有效抑制旁瓣的特点,很好地完成符号同步。在多径信道下,与已有方法进行比较。仿真结果表明,提出的算法在计算复杂度低的情况下有效降低了同步均值偏差,提高了正确同步估计的概率。

A new approach with mismatched-sequence was proposed to complete OFDM symbol synchronization. The symbol synchronization was well completed by adding mismatched-sequence to OFDM signal as training sequence, calculating of the cross-correlation between the reeeived mismatched sequence with the mismatched filter coefficient, and using of auto-correlation-property of the mismatched-sequenee and effective sidelobe suppression. Comparison was done between the proposed algorithm and the existing algorithm in the muhipath fading channel. Simulation results show that the new algorithm reduces the average deviation of synchronization effectively and improves the probability of the correct synchronization estimation in loweomplexity.