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为提高基于网络协议的正交频分多址(IP-OFDMA)系统中采样时钟频率偏差与残余频偏的估计精度,结合IP-OFDMA的自身导频结构特点,对经典估计方法进行改进,提出3种不同采样时钟频率偏差与残余频偏的估计方法.通过抛弃低频区离散导频子载波,有效抑制了低频噪声对估计性能的影响,提高了估计精度.理论分析以及在AWGN和COST207信道两种系统带宽下的仿真结果表明了该3种方法在复杂度和估计精度方面的差别,并给出选用原则和依据.
In order to improve the estimation accuracy of the sampling clock frequency offset and residual frequency offset in the Orthogonal Frequency Division Multiple Access (IP-OFDMA) system based on network protocol, the classical estimation method is improved based on the characteristics of the pilot structure of IP-OFDMA Three kinds of different sampling clock frequency deviation and residual frequency offset estimation method.Discard the low frequency region scattered pilot subcarriers, the effective inhibition of the low frequency noise on the estimation performance and improve the accuracy of the estimation.Analysis of the theory and in AWGN and COST207 channel two The simulation results under the kind of system bandwidth show the differences between the three methods in terms of complexity and estimation accuracy, and give the principle and basis of selection.