In this paper, an improved frequency offset estimation algorithm is proposed. It can effectively utilize pilot symbols in orthogonal frequency division multiplexing (OFDM) signals based on the Digital Radio Mondiale (DRM) system. In order to reduce the computational difficulty, the difference values of adjacent pilot symbols in the DRM system are sequentially combined into a pilot difference set. The pilot difference set is analyzed by inductive statistics so that the frequency offset estimator has higher calculation efficiency and accuracy. Through the induction statistics of multiple groups of symbols, the contingency of results can be effectively avoided. By comparing the performance of the proposed frequency offset estimator with that of the traditional estimators, the proposed algorithm has higher frequency offset estimation accuracy.

中文翻译：

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基于DRM系统的改进频率偏移估计

本文提出了一种改进的频偏估计算法。它可以在基于数字无线电Mondiale（DRM）系统的正交频分复用（OFDM）信号中有效利用导频符号。为了降低计算难度，将DRM系统中的相邻导频符号的差值顺序地组合成导频差集。通过归纳统计分析导频差集，从而使频率偏移估计器具有更高的计算效率和精度。通过对多组符号的归纳统计，可以有效避免结果的偶然性。通过比较所提出的频偏估计器和传统估计器的性能，该算法具有更高的频偏估计精度。