基于PN序列的频偏估计算法

本文提出了一种基于时域PN序列导频相关性的频偏估计算法,通过计算接收信号和发送信号共轭乘积的自相关函数,将频偏估计问题转化为一个单频谱估计问题,并且给出了简化的谱估计算法,从而避免了频率搜索,具有较低的实现复杂度,另外,此算法使用和符号同步相同的PN序列资源,节省系统频谱资源。在多径信道下也给出了相应的形式,经过理论分析和仿真证明了,在多径信道下,改进算法的获得了频率分集增益,提高了估计性能。

A novel frequency offset estimation algorithm based on PN sequence

In this paper we proposed a new frequency offset estimation algorithm based on the relativity of the pseudo noise sequence. By calculating the correlation function of the multiplication of the signal transmitted and the signal received, the frequency offset esti- mation is converted to Single Tone Parameter Estimation, and finally we derive a simplified algorithm. By utilizing this algorithm, the frequency searching is avoided, so it is easily implemented. What' s more, the new algorithm saves the frequency resource by using the same pseudo noise sequence with synchronization. We also give the corresponding form of the algorithm in multipath channel. Theoretical analysis and simulation results show excellent performance of the frequency offset estimation by proposed algorithm over wireless multipath channel.