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提出了一种基于导频符号的多输入多输出正交频分复用(MIMO-OFDM)系统多频偏估计算法。该算法设计了导频符号,并利用设计的导频符号在频域实现多频偏估计。理论分析证明了提出算法适用于低信噪比条件,并推导出了该多频偏估计算法理论上的估计精度。仿真结果验证了提出的算法在低信噪比无线多径信道条件下能够准确估计出各天线间的多个载波频偏。
A multi-input multi-output orthogonal frequency division multiplexing (MIMO-OFDM) multi-frequency offset estimation algorithm based on pilot symbols is proposed. The algorithm designs pilot symbols and uses the designed pilot symbols to implement multi-frequency offset estimation in the frequency domain. The theoretical analysis proves that the proposed algorithm is suitable for low signal-to-noise ratio conditions, and deduces the theoretical estimation accuracy of the multi-frequency offset estimation algorithm. The simulation results show that the proposed algorithm can accurately estimate the carrier frequency offset between antennas under the condition of low signal-to-noise ratio wireless multipath channel.