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主要讨论利用叠加导频技术对OFDM系统进行定时和频偏估计的算法。该算法利用线性叠加在OFDM符号上的PN序列估计定时和频率偏移。使用定时和频偏估计的方差来评价系统性能。通过在高斯和衰落两种信道中的仿真结果说明,此算法能够进行精确定时并且频偏估计范围较大。
This paper mainly discusses the algorithm of estimating the timing and frequency offset of OFDM system by using the superposition of pilot techniques. The algorithm estimates the timing and frequency offsets using PN sequences linearly superimposed on OFDM symbols. The variance of the timing and frequency offset estimation is used to evaluate the system performance. The simulation results in both Gaussian and fading channels show that this algorithm can be precisely timed and has a large frequency offset estimation range.