一种基于连续导频的OFDM载波同步算法

Carrier synchronization algorithm for OFDM based on continuous pilots

OFDM系统能否充分发挥其优势在很大程度上要取决于同步性能的好坏。在对现行的几种主要的载波同步算法进行分析的基础上,提出了一种基于连续导频的OFDM载波同步算法。并进行了大量的计算机仿真,来验证算法的性能。仿真结果表明,算法能够在衰落信道下准确地估计整数倍和小数倍的载波频率偏差,而且不需迭代就可以达到很高的估计精度,若要进一步提高估计精度,还可以进行迭代运算。可以认为该算法是一种高效的载波同步算法。

Whether the advantages of OFDM can be made full use of depends to a large extent on the performance of synchronization. After an analysis of several existing carrier synchronization algorithms, a novel carrier synchronization algorithm for OFDM based on continuous pilots was proposed. A lot of computer simulations were done to validate the performance of the algorithm. Numerical results show that the algorithm can make an accurate estimation of both integral and fractional frequency offsets over fading channels. The accuracy of the estimation is high even without iterations and if higher accuracy is required, iterations can be implemented. The algorithm can therefore be considered as an efficient carrier synchronization algorithm.