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文中针对基于OFDM传输体制的多媒体传感网节点,提出了一种新的频偏估计算法。在频域,可以方便去除虚拟子载波上噪声的影响,提高性能,同时根据每个子载波的解调信噪比对各个子载波的估计结果,进行最大比加权平均,可以有效的克服频率选择性衰落的影响。采用信道的统计信息,本文提出了一种低复杂度,可实现的方法。算法的仿真结果表明本文提出的算法能有效的克服多径的影响,并且在性能上比时域估计和等增益平均的方法有较大的改进。
Aiming at the multimedia sensor network node based on OFDM transmission system, a new frequency offset estimation algorithm is proposed. In the frequency domain, the influence of noise on the virtual subcarrier can be easily removed to improve the performance. Meanwhile, the maximum ratio weighted average of the estimation results of each subcarrier according to the demodulation signal-to-noise ratio of each subcarrier can effectively overcome frequency selectivity The impact of decline. Using the channel statistics, this paper presents a low complexity and achievable method. The simulation results show that the proposed algorithm can effectively overcome the impact of multipath, and the performance is better than the time-domain estimation and equal-gain averaging method has been greatly improved.